UK — ScotWind Leasing (Crown Estate Scotland, 2020-2022)
1. At a glance
| Auction type | Seabed leasing — single-stage scored application with bidder-chosen capped Option-Fee Valuation; not a sealed-bid auction in the R4 sense (no descending price discovery, no per-cycle bid submission, no English-ascending mechanism) |
| Awarding body | Crown Estate Scotland (CES) — the seabed lessor for Scotland's territorial waters and Scottish part of the UK Renewable Energy Zone, exercising devolved powers under the Scotland Act 2016 and the Crown Estate Transfer Scheme 2017. Distinct legal entity from The Crown Estate which runs the E&W&NI rounds (R4/R5) |
| Spatial framework | 15 Plan Options defined by the Scottish Government's Sectoral Marine Plan for Offshore Wind Energy (October 2020) — bidders applied for areas within these polygons; out-of-Plan applications were not accepted. Plan Options span East coast (E1–E3), North-East (NE1–NE4, NE6–NE8), North (N1–N4), and West (W1) |
| Aggregate seabed cap | 8,600 km² across all Option Agreements (per SMP National Limit derived from a 10 GW SA cap and 1 MW per 0.86 km² assumed density) |
| Per-Plan-Option caps | Lower of (a) Plan Option extent (km²) or (b) area corresponding to the SMP "realistic maximum development scenario" for that Plan Option (1–3 GW per Option) |
| Per-application cap | 860 km² (single continuous boundary, wholly within a single Plan Option) |
| Per-organisation cap | 5 applications per organisation in a Wind Farm Delivery Responsibility role |
| Minimum project capacity | 100 MW per project (per SMP commercial-scale definition) and per phase if multi-phase |
| Minimum density | 1 MW/km² of Option Agreement Area; 3 MW/km² of eventual Lease area |
| Pre-qualification | None — single-stage application (no separate PQQ). Qualification is embedded in the application via Parts D (Capability and Experience), E (Funding), F (Health and Safety) and G (Preparedness), all scored as part of the application |
| Bid variable | Applicant Valuation in £/km², chosen by the Bidder from a fixed list of pre-defined levels (Application Form Question A7) ranging from a floor of £2,000/km² to a ceiling of £100,000/km² |
| Option Fee | One-off lump-sum = Applicant Valuation × Option Agreement Area, paid at execution of the Option Agreement. Not an annuity (contrast R4: £/MW/year). Not a recurring rent (contrast Lease rent below) |
| Award criterion | Four-input ranking waterfall applied successively: (1) Coarse Grade (Band 1/2/3 — Band 1 = automatic fail), (2) Applicant Valuation £/km² (higher = higher rank), (3) Detailed Numerical Score (0–450, higher = higher rank), (4) Random Number allocated at Registration (higher = higher rank). Top of ranked list iterated in order, with each candidate gated by aggregate seabed cap, per-Plan-Option cap, and 5 km competing-interest filter |
| Tiebreak chain | The four-input waterfall itself is the tiebreak — there is no separate tiebreak procedure. If two applications tie on the higher input, the next input is used. The terminal random-number input ensures deterministic rank order even on full-stack ties |
| Capacity target | No explicit MW or GW target — the round was capped by area (8,600 km² aggregate) rather than capacity. Capacity outcome was an emergent property of bidders' density choices |
| Tender launch (initial) | June 2020 — original Offer Document published with £10,000/km² option-fee cap |
| Tender re-launch (revised) | April 2021 — revised Offer Document published with option-fee cap raised 10× to £100,000/km², following Aurora Energy Research Rapid Review (March 2021) commissioned in response to Crown Estate Round 4's February 2021 results |
| Application window | 04 June 2021 (intention to apply invitations) → 16 July 2021 (Closing Date for applications, application fee £20,000 + VAT) |
| Initial-cohort results | 17 January 2022 — 17 projects awarded (out of 74 applications), £699.2m option fees, 24,826 MW, ~7,000 km² of seabed |
| Initial-cohort agreements signed | April 2022 |
| Clearing process opened | April 2022 — opened for Band 2/3 unsuccessful Applicants who had been out-competed for site, with the NE1 area east of Shetland made specifically available |
| Clearing-cohort results | 22 August 2022 — 3 floating projects awarded (out of 14 Clearing applications), £56m option fees, 2,800 MW, ~560 km² (all in NE1) |
| Clearing-cohort agreements signed | 02 November 2022 — concludes the leasing round |
| Final round totals | 20 projects · 27.6 GW · £755m total option fees · ~7,560 km² · ~£28.8bn initial Scottish supply-chain commitments (£1.4bn/project / £1bn/GW) |
| Lease term (post-Option-exercise) | Long-term Lease (tens of years; see model-form-lease for exact term and break clauses) |
| Lease rent | £1.07/MWh CPI-indexed, payable quarterly based on offshore wind farm output. Distinct from a fixed annual fee — the rent scales with generation |
| Annual operational guidance | ~£4m/GW/year post-COD (per CES Aug 2022 Clearing release) — a working estimate at typical capacity factors and CPI-base year, not a contractual rate |
| Disposal Premium | 100% of the disposal price exceeding the Option Fee at the start of the Option Period, declining linearly to 75% at Year 3, then 0% thereafter — anti-flipping mechanism |
| Financial security | Option Cap £5m, Lease Cap £7m / £10m / £15m by capacity band (100–500 MW / 500–1,000 MW / 1,000+ MW). Forms accepted: Parent Company Guarantee (BBB- or 20× net assets), LoC/Bond (A-grade bank), or cash deposit |
| Supply chain mechanism | Supply Chain Development Statement (SCDS) — mandatory for application completeness but explicitly NOT used in scoring. Initial SCDS Commitments are nonetheless incorporated into Option Agreement Schedule Part 6 and become contractual; updated periodically through the development period |
| Revenue mechanism (Axis 6) | Null — ScotWind is a pure leasing auction; winners must compete separately in CfD Allocation Rounds (or pursue PPA / merchant routes) for revenue. CfD pairing is commercial dependency, not legal prerequisite |
| Downstream pairing | UK CfD Allocation Rounds (AR4 onwards). To date AR7 (Jan 2026) awarded a CfD to one ScotWind asset (Pentland Floating, 92.5 MW, Highland Wind / CIP) |
| Headline significance | First competitive offshore-wind seabed leasing round under devolved Crown Estate Scotland authority; the world's largest commercial floating-wind round (10 of the initial 17 projects + all 3 Clearing projects floating); pioneering use of contractually binding supply-chain commitments via SCDS; established the £100,000/km² option-fee cap as the reference price for Scottish offshore-wind seabed |
Sources (14 primary documents, all mirrored to local corpus): see §13 below. Two Offer Documents (original 2020 + revised April 2021), Guidance Notes (April 2021), Model Form Option Agreement (June 2021), Model Form Lease, SCDS Summary, Aurora Rapid Review (March 2021), CES Briefing (Nov 2023), Scottish Government SMP (Oct 2020), four CES press releases / SCDS rollup, and the Scottish Government Net Zero Secretary's parliamentary statement (18 Jan 2022).
2. What makes ScotWind structurally different from CE R4, AR6, Thor, DE N-12.1, and US NY Bight
This is the point of running ScotWind as a sixth pilot — it differs from all five earlier cases on several axes simultaneously, most starkly from CE R4 which is the closest analogue.
| Dimension | UK CE R4 | UK AR6 | DK Thor | DE N-12.1 | US NY Bight | UK ScotWind |
|---|---|---|---|---|---|---|
| Awarding authority | The Crown Estate (E&W&NI) | DESNZ + LCCC + NESO | Danish Energy Agency | BNetzA | BOEM | Crown Estate Scotland (devolved 2017) |
| Scope | Seabed lease + AfL | Offtake only | Combined concession + offtake | Seabed right + concession | Federal lease only | Seabed Option Agreement → Lease (single-instrument seabed-only; no offtake) |
| Bid-format pattern | Multi-cycle daily sealed-bid | Sealed bid pay-as-clear | Sealed single bid + lottery fallback | Sealed → dynamic ascending | Ascending multi-round English | Single-stage scored application (no per-cycle bidding, no descending or ascending price discovery) |
| Bid variable | £/MW/year annuity | £/MWh strike price | DKK øre/kWh CfD premium | € cents/kWh stage-1 → €/MW stage-2 | $ bonus bid (lump sum) | £/km² lump-sum valuation, chosen by bidder from pre-defined levels (£2k–£100k cap) |
| Bid range | Free above £250/MW/yr reserve | Bounded by Administrative Strike Price | Unbounded above floor | Unbounded above zero | Unbounded above $100/acre minimum | Discrete pre-defined levels within £2k–£100k/km² band — bidders pick a level, do not write a free price |
| Price-payment timing | 10-yr annuity during AfL | 15-yr CfD post-COD | 20-yr CfD post-COD | One-time + 20-yr tail | One-time at lease execution | One-time lump sum at Option Agreement execution |
| Award criterion | Highest £/MW/yr above reserve, gated by cascading caps | Lowest strike price clearing pot/Maxima | Lowest CfD premium (state-aid bounded) | Lowest premium → highest concession | Highest bonus bid | Four-input ranking waterfall — quality coarse-grade gate, then valuation, then detailed score, then random number |
| Multi-criteria scoring? | No — pure £/MW/yr after PQQ pass/fail | No — pure £/MWh after qualification | No — pure premium | No — pure premium / pure concession | No — pure bonus bid | Yes — four-input waterfall with quality coarse-grade and 0–450 detailed numerical score as 2 of the 4 ranking inputs, with valuation as 1 of the 4 |
| Quality dimensions | Pass/fail PQQ + ITT-1 | Standalone qualification gates | Pre-qualification (binary) | Pre-qualification (binary) | BOEM Qualification (binary) | Coarse Grade (3-point band scale derived from all questions ex A7/G2) AND Detailed Numerical Score (0–450 from a subset) — both are continuous scoring inputs, not pass/fail gates |
| Site model | Pre-defined Bidding Areas (4) | n/a (offtake) | Single named site | Single named site | 6 federally-defined leases | 15 SMP Plan Option polygons + bidder-defined sub-areas within — bidder draws their preferred application boundary |
| Eligibility caps at award | Cascading (cash/3GW/3-projects/3.5GW area/5km overlap) | Pot budget + Maxima | Single-site | Single-site | Per-bidder one-lease | Aggregate 8,600 km² + per-Plan-Option Realistic Maximum + 5 km competing-interest + 5-applications-per-org-with-WFD-Responsibility |
| Number of cohorts | 1 (single bidding window) | 1 | 1 + lottery | 1 stage-1 + 1 stage-2 | 1 (3-day ascending) | 2 cohorts: initial + Clearing — Clearing is a structured second-window for unsuccessful Band 2/3 Applicants who were out-competed for site, requiring revised applications and 35 km consent from prior winners |
| Tiebreak | None explicit | Closest envelope fit then random | Highest capacity → physical lottery | Lottery on equal intra-round bids | Maximise total bid value then pseudorandom | The four-input waterfall itself is the tiebreak — terminal random-number input guarantees deterministic order |
| Revenue mechanism (Axis 6) | Null | CfD 2-way | CfD 2-way + caps | Statutory feed-in premium @ zero | Null | Null (paired with CfD Allocation Rounds for revenue, as per R4) |
| Mandatory-but-non-scored bid component | None | None | None | None | None | Supply Chain Development Statement (SCDS) — see §6.4 below. Unique to ScotWind in the pilot set — competition does not score on it, but contract is conditioned on it via Schedule Part 6 |
| Supply-chain commitments | Project-by-project but no contractual SCDS framework | n/a (offtake) | Limited | Limited | Limited | Contractually binding SCDS Commitments table written into OA Schedule Part 6, periodic updates required, CPS (Contracted Position Statement) reporting through development period — first contractual supply-chain accountability framework in UK offshore wind |
| Lease rent | £/MW/year × CPI during AfL, then post-exercise rent | n/a | n/a | n/a | $3/acre + 2% operating fee | £1.07/MWh CPI-indexed quarterly — a generation-linked rent, not a fixed-time payment |
The single most important structural difference is ScotWind is not really an "auction" in the price-discovery sense. There is no descending or ascending bid mechanic, no per-cycle clearing, no head-to-head price competition. Bidders pick a valuation from a discrete menu (10 levels between £2k and £100k/km²), submit it as Question A7 of a single application, and the entire competitive layer reduces to a four-input ranking waterfall in which the chosen valuation is one of four ordered inputs. Most winners selected the maximum valuation (£100,000/km²) — the design is essentially "pay-the-cap to get into the top tranche" rather than "discover the market-clearing price". The Aurora Rapid Review (§5 below) explicitly anticipated this: at any plausible market valuation, the cap binds; the binding cap shifts competitive pressure away from price toward the Detailed Numerical Score (the quality dimension) and ultimately toward the random number (a pure lottery element).
3. Political and legal context
3.1 Devolution of Crown Estate Scotland
ScotWind exists because of the Scotland Act 2016, which devolved management of the Scottish Crown Estate's economic assets (including seabed in Scottish waters and the Scottish portion of the UK Renewable Energy Zone) from the UK-wide Crown Estate to a new Scottish public body. The transfer was effected by the Crown Estate Transfer Scheme 2017 (SI 2017/524) and the Crown Estate Scotland (Interim Management) Order 2017, with the permanent body Crown Estate Scotland taking over assets on 1 April 2017. Scottish Ministers direct CES on policy; CES retains operational independence on leasing decisions.
ScotWind is therefore the first competitive offshore-wind seabed leasing round held by Crown Estate Scotland in its own right, and the first held in Scottish waters since the Scottish Territorial Waters round (2010), run pre-devolution by The Crown Estate, which allocated 11 sites including Inch Cape, Neart na Gaoithe, Seagreen, and Moray East. ScotWind's 12-year gap from 2010–2022 reflects the attrition and consenting cycle of those Scottish Territorial Waters projects rather than a deliberate moratorium.
3.2 Sectoral Marine Plan as the spatial framework
ScotWind is statutorily anchored to the Scottish Government's Sectoral Marine Plan for Offshore Wind Energy (SMP), adopted in October 2020 by Marine Scotland (then part of the Scottish Government, now the Marine Directorate). The SMP defines 15 Plan Options — pre-screened spatial polygons within Scottish waters deemed suitable for commercial-scale (≥100 MW) offshore wind development, with environmental and stakeholder considerations incorporated.
The SMP set a National Limit of 10 GW of generating capacity (arrived at via the Sustainability Appraisal as a mitigation measure against cumulative environmental impact) and assumed a deployment density of 1 MW per 0.86 km², yielding the upper-bound lease area of ~8,600 km² that CES could award via the first ScotWind cycle. Each Plan Option also carries its own "realistic maximum development scenario" (1–3 GW), which translates back to a per-Plan-Option seabed cap (lower of Plan Option extent or scenario-derived area).
The Plan Options are listed in offer-document.md Table 1:
| Plan Option | Realistic max GW | Plan Option area (km²) | Max area available for OAs (km²) |
|---|---|---|---|
| E1 | 3 | 3,742 | 2,580 |
| E2 | 2 | 1,287 | 1,287 |
| E3 | 1 | 474 | 474 |
| NE1 | 2 | 751 | 751 |
| NE2 | 1 | 345 | 345 |
| NE3 | 1 | 265 | 265 |
| NE4 | 1 | 440 | 440 |
| NE6 | 2 | 699 | 699 |
| NE7 | 3 | 684 | 684 |
| NE8 | 1 | 339 | 339 |
| N1 | 2 | 1,163 | 1,163 |
| N2 | 2 | 561 | 561 |
| N3 | 2 | 1,106 | 1,106 |
| N4 | 1 | 200 | 200 |
| W1 | 2 | 754 | 754 |
NE5 was excluded from the Plan Options, hence the gap in the NE-series numbering. The W1 Plan Option (West coast, the Hebrides shelf) was included but received no winning bids.
3.3 Statutory authority
CES's leasing authority derives from the Crown Estate Act 1961 (as
amended) read with the Scotland Act 2016 transfer. The auction
itself is not a statutory auction under any specific Act — it is
a commercial leasing process administered by a public body, run
under general procurement principles, but explicitly not subject
to the Public Contracts (Scotland) Regulations 2015 because (per
offer-document.md §7.4):
"This is a competition for each of the bidders to achieve an interest in land by way of a lease. Therefore it is not a contract to which the Public Contracts (Scotland) Regulations 2015 apply."
This excludes ScotWind from PCR procurement remedies; bidders' recourse against process is general public-law judicial review, not contracting-authority remedies.
3.4 Policy targets
The Scottish Government's Net Zero Secretary statement (scotgov-statement-jan-2022.md)
frames ScotWind against:
- Net zero emissions by 2045 (Scottish target, set by the Climate Change (Emissions Reduction Targets) (Scotland) Act 2019)
- 5 GW renewable and low-carbon hydrogen by 2030, 25 GW by 2045
- At least 8 GW offshore wind in Scottish waters by 2030 (per SMP)
ScotWind's outcome materially over-delivered against the 8 GW 2030 target, with 27.6 GW of awarded capacity option-rights — though realised installed capacity by 2030 will be a small fraction of this given typical offshore-wind development lead times of 8–12 years from seabed award to COD.
4. Auction design — the four-input ranking waterfall
ScotWind's evaluation methodology is set out in offer-document.md §5
(and elaborated in guidance-notes.md). The structure has two
phases:
4.1 Phase 1 — Coarse Grading (qualification-equivalent gate)
Every application is scored to a 3-point coarse grade:
- Band 1 (lowest) = "the response does not meet Crown Estate Scotland's minimum level of acceptable response" → automatic fail, no Option Agreement offered
- Band 2 = acceptable, but not strong
- Band 3 (highest) = strong
The Coarse Grade is derived from all responses except Q A7 (Applicant Valuation) and Q G2 (Preparedness) considered in detail. This is the qualification surface — but unlike CE R4 (where PQQ is binary pass/fail) or AR6 (where qualification gates are independent of scoring), in ScotWind the qualification result is one of the four ranking inputs (Band 2 ranks lower than Band 3, even when both pass).
4.2 Phase 2 — four-input ranking waterfall
After Band 1 applications are removed, the surviving applications are
ranked using four inputs successively (per offer-document.md §5.4.1):
"Following the coarse grading, which results in the removal of those applications scoring Band 1, applications are set in overall ranking order considering four scoring inputs successively:
- A coarse grading which can be Band 2 or Band 3, with Band 3 being highest ranked.
- An Applicant Valuation, as per the pre-defined levels set out in the Application Form, that range from £2,000/km² to £100,000/km². Higher valuations are higher ranked.
- A detailed numerical score, which will be between 0 and 450. Higher scores are higher ranked.
- Random number allocation at Registration (described in Section 4.1). Higher number is higher ranked."
The waterfall is lexicographic: input N is only consulted to break ties on inputs 1…(N-1). Two applications with the same Coarse Grade are then sorted by Applicant Valuation; if still tied, by Detailed Numerical Score; if still tied, by Random Number. The Random Number ensures the rank is always strictly ordered — there is no ambiguity at the bottom of the waterfall, no separate tiebreak procedure, and no human discretion once the ranking is set.
The illustrative ranking table from offer-document.md Table 4
clearly shows this in action: Projects A, B, C all have Band 3 +
£100,000/km² + 448/406/406 detailed scores (B and C tied on detailed)
→ B and C separated by Random Number (71 vs 65 → B ranked above C).
4.3 Phase 3 — top-down award with cap and competing-interest filtering
Applications are considered for offer in rank order from the top, with each candidate gated by:
- Aggregate seabed cap — would awarding this Option Agreement take the cumulative total above 8,600 km²? If yes → discount.
- Per-Plan-Option cap — would awarding it take the cumulative awarded area in this Plan Option above the Plan Option's max (Table 1)? If yes → discount.
- 5 km competing-interest filter — does this application's boundary come within 5 km of an already-awarded application's boundary, or overlap it? If yes → out-competed → removed from ranking (the lower-ranked application loses to the higher-ranked).
Each successful application's Bidder pays the Option Fee, arranges financial security, and signs the Option Agreement by a CES-defined deadline. Failures produce withdrawals; CES then runs a second batch of offers drawing from those previously discounted by caps or out-competed by withdrawn winners. No third batch.
After both batches, surviving Band 2/3 unsuccessful Applicants (those out-competed for site, not those discounted by caps alone) become eligible for the Clearing process (§4.4).
4.4 The Clearing process — second cohort
Per offer-document.md §5.4.3, Clearing is a structured second
opportunity for "capable Applicants (achieving a coarse grade higher
than Band 1) who do not receive an offer of an Option Agreement
through the process described in 5.4.1". Three conditions must be met
for Clearing to commence:
- At least one Applicant entitled to make a Clearing request
- That Applicant confirms intention to make one
- Scope for further Option Agreements within SMP restrictions
Clearing entitles eligible Applicants to submit a revised Application Form for an area of seabed within the SMP. Critically, the new area "need not overlap with, or be located in the same Plan Option, as was the initial application" — Clearing is a chance to re-target a different polygon entirely. Two new constraints attach to Clearing applicants:
- 5 km consent rule (as for initial round): consent from any adjacent pre-existing offshore-wind agreement holder within 5 km.
- 35 km consent rule (new for Clearing): consent from any ScotWind initial-cohort Option Agreement holder within 35 km of the Clearing application.
This 35 km rule is a notable feature: it gives the initial cohort veto rights over Clearing applicants in their broader vicinity. The geographic effect was to push Clearing applications into areas distant from the initial cohort — and in practice CES made the NE1 area east of Shetland specifically available for Clearing, where no initial-cohort awards had been made.
The Clearing scoring methodology is the same as the initial round — coarse grade + four-input waterfall — applied to the revised applications.
4.5 Why this is a "scored application" not an "auction"
Standard auction-theoretic taxonomy (sealed-bid first-price, sealed-bid second-price, English ascending, Dutch descending, multi-round clock, etc.) requires bidders to submit prices that aggregate into a clearing mechanism — either in a single round (sealed) or across rounds (dynamic). ScotWind has neither:
- Bidders pick a valuation level from a discrete menu as one question on a single application form. There is no per-round price resubmission, no opportunity to revise downward in response to competitor signals, no clearing mechanism that aggregates the collective bids into a single market price.
- The Applicant Valuation is one input of four in the ranking, not the dispositive variable.
- The dominant strategy for any seriously-competing bidder is to pick the £100,000/km² maximum, since the cap binds and the next-most important variable (Detailed Numerical Score) is determined by application quality, not by valuation. (Aurora's analysis predicted this; the published Applicant Valuations confirm it post-hoc.)
The closest taxonomic analogue is a beauty contest with a discrete optional fee uplift, or a graded scoring round with a price input. The Bond R5 floating round (in concept) and several pre-2010 European seabed allocations used similar structures. CE R5 (Celtic Sea floating, 2025) is a distant cousin in spirit — both prioritise deliverability and quality over pure price.
5. Why the £100,000/km² cap, and why it binds — the Aurora Rapid Review
ScotWind's most consequential design parameter is the option-fee cap of £100,000/km². The original 2020 launch had a cap of £10,000/km²; the April 2021 re-launch raised it 10×.
The driver was the Crown Estate Round 4 results published in early February 2021. R4's six winning option-fee bids ranged from £76,203 to £154,000/MW/year (annuity over up to 10 years) — far above market expectations and translating to upfront-equivalent valuations for a 1.5 GW project with typical density of ~5 MW/km² of approximately £500,000–£800,000/km² in present-value terms. CES commissioned Aurora Energy Research to assess the implications for ScotWind, which published the Rapid Review in March 2021.
Aurora's findings, per aurora-rapid-review.md:
- "The R4 results suggest SWL would likely see a lot of interest with most bids at the option fee cap" — i.e. the original £10,000/km² ScotWind cap was almost certainly below market value, which would mean nearly all serious bidders would pick the cap and the competitive layer would collapse onto the Detailed Numerical Score and Random Number alone.
- "There is potentially room for the SWL price cap to increase. An increase by a factor of 10 would still allow Scottish projects to compete favourably against English projects with R4 lease options" — quantitative modelling showed Scottish-project economics could absorb a 10× cap uplift without putting Scottish CfD bids out of the money relative to English R4 winners.
- "The current SWL price cap would allow the best Scottish projects to succeed in floating-only CfD tenders. Increasing the cap by 10-fold will not likely change the relative competitiveness between English and Scottish floating projects" — the floating technology pot in CfD AR4+ would not be materially distorted by the higher cap.
- Recommendations: (i) raise cap to £100,000/km²; (ii) retain the discrete-levels structure (vs free-write bid) but introduce "evenly-spread intermediate price points with moderate size gaps" between the original £2k/£6k/£10k anchors and the new £100k cap; (iii) a separate fixed-vs-floating valuation ladder is "not required as long as the new price cap is not raised too high".
CES adopted recommendations (i) and (ii) in the April 2021 Offer
Document (and did not introduce a separate floating-vs-fixed
valuation ladder, per (iii)). The resulting pre-defined valuation
levels were £2,000 / £6,000 / £10,000 + intermediate steps up to
£100,000 — see offer-document.md §5.4.1 and the worked example in
Table 4.
Why this matters for the ranking: even at £100,000/km², the cap likely still binds for top-tier projects, which means the Applicant Valuation input largely separates "willing to pay top dollar" from "valuation-constrained" Applicants, but does not finely discriminate between top-tier projects. The competitive battle therefore plays out on the Detailed Numerical Score (quality of the application, 0–450) and ultimately on the Random Number (pure lottery between equally- strong Band 3 / £100k applications). This explains why ScotWind's results show several winners with identical valuations and similar detailed scores — the design intentionally allocates the residual discrimination to chance once project quality is at the top tier.
6. Prize composition
6.1 The instrument: an Option Agreement leading to a Lease
ScotWind awards an Option Agreement (OA), per model-option-agreement.md,
which entitles the Tenant Organisation to develop the project (consents,
surveys, FID) during the Option Period and then serve an Option
Notice to convert the OA into one or more Leases (per phase) over
the eventual lease area. The OA and Lease are the legal instruments;
together they constitute the seabed prize.
6.2 Option Period
The Option Period is requested by the Applicant in Question A8 of
the Application Form, up to a maximum of 10 years (per
offer-document.md Table 2). After Option Period expiry, no Lease
can be requested → no construction → project ends. There are two
development milestones during the Option Period (both relate to
submission of key project consent documents); failure to meet a
milestone reduces the Option Period; meeting the second after missing
the first restores the previously-reduced Option Period.
6.3 Option Fee — the one-off lump sum
The Option Fee is paid at the time the Option Agreement is entered, calculated as:
Option Fee = Applicant Valuation (£/km², chosen from menu) × Option Agreement Area (km²)
The Option Fee is one-off — there is no annual repeat payment. This is structurally different from CE R4's annual £/MW/year annuity spread across up to 10 years. ScotWind's "lump-sum at execution" is closer to US NY Bight's bonus bid mechanic, except ScotWind's "bid" is constrained to a discrete menu and is just one input of four in the ranking.
Bidder cash exposure timing (R4 vs ScotWind): a 1.5 GW R4 winner at £100,000/MW/year spreads ~£150m/year × 10 = £1.5bn nominal across the AfL period. A ScotWind winner with a 500 km² Option Area at £100,000/km² pays a single £50m at execution. The R4 model pushes the cash burden into the development period (when developers have spending in flight); the ScotWind model concentrates it at award (when developers are still raising capital).
6.4 Supply Chain Development Statement (SCDS) — mandatory but not scored
The SCDS is the most distinctive — and contentious — design element of ScotWind's prize structure.
The mechanism (offer-document.md §3.6, scds-summary.md,
model-option-agreement.md Clause 24, model-form-lease.md Clause 11):
every Applicant must submit, as Question A13 of the Application Form,
a Supply Chain Development Statement consisting of:
- SCDS Outlook — a ≤1,000-word public summary of supply-chain intent across the project lifecycle (development → construction → O&M)
- SCDS Ambition table — anticipated Expenditure (set at Applicant's discretion, not contractually binding, never written into the OA)
- SCDS Commitments table — Expenditure that will be committed to (also set at Applicant's discretion, but incorporated into Option Agreement Schedule Part 6 as binding commitments)
- SCDS Narrative — explanation of how the tables are calculated
Critically, per offer-document.md §3.6.1:
"The ScotWind Leasing process does not impose any requirement on the level or the location of supply chain Expenditure that is set out by applicants in the SCDS. The SCDS information will not be used in the assessment or scoring of applications, and will not be compared with the budget information provided in Part E of the application form. If the SCDS is not provided in response to Question A13 then the application will be deemed incomplete and will not be evaluated."
This is a two-handed mechanism: the SCDS is non-evaluative at auction (no scoring weight, no comparison with budget) but fully contractual post-award (initial Commitments incorporated into OA Schedule Part 6, periodic updates required, CPS — Contracted Position Statement — reporting through the development period).
Scottish Government framing: the Net Zero Secretary's parliamentary
statement (scotgov-statement-jan-2022.md) explicitly cast the SCDS
as "an excellent tool to ensure that, working with the sector, Scottish
communities reap the maximum possible economic benefits from ScotWind
projects. These statements are not only an indication of what
Scotland can achieve, they are our expectation of what the winners
will deliver for Scotland."
Outcome: post-Clearing roll-up (per clearing-confirmed-nov-2022.md)
gave aggregate initial SCDS Commitments of £28.8bn across the 20
projects (£1.4bn/project, £1bn/GW). Subsequent updates in 2023 (per
the CES briefing) revised the per-project average upward to £1.5bn
per project, indicating early developer commitment escalation
even before construction.
Pilot-set significance: this is the first instance in the AgentZero auction pilot set of a mandatory-but-non-scored bid component that nonetheless becomes contractually binding post-award. AR6/AR7's Clean Industry Bonus is a separate non-price competition (it generates its own contracts and budget), not a non-scored mandatory submission with contractual carry-through. This is a candidate for a v0.7 schema revision (see §14).
6.5 Lease rent — output-linked, CPI-indexed
Per offer-document.md Table 2:
"Rent will be payable quarterly based on the offshore wind farm output at a rate of £1.07/MWh indexed to CPI."
This is a generation-linked rent, not a fixed annual payment. At a typical offshore wind capacity factor of 45–55% applied to a 1 GW project, £1.07/MWh × 1,000 MW × 8,760 h × 0.5 (CF) ≈ £4.7m/year — consistent with the ~£4m/GW/year working estimate CES gave in the August 2022 Clearing release. The rent only kicks in post-COD (once the project is generating); during the Option and pre-COD Lease period, no rent is paid (only the one-off Option Fee).
6.6 Disposal Premium — anti-flipping
Per offer-document.md Table 2 (continued):
"The Disposal Premium will be based on the amount that the disposal price exceeds the Option Fee paid on initial award of the agreement, after allowing for the value of development expenditure since the Option Agreement commenced. The Disposal Premium will be calculated according to the time of the disposal — it will be 100% of the amount disposal price exceeds the Option Fee at the start of the Option Agreement and will reduce on a daily basis to 75% to the date three years following Option Agreement signature. There is no Disposal Premium payable on disposals occurring more than three years into the Option Period."
This is a time-decaying tax on flipping: a Tenant who sells the project to another developer in Year 0 owes 100% of the upside; in Year 3 owes 75%; after Year 3 owes nothing. The mechanism is calibrated to discourage speculative bids that would never have intended to develop, while permitting legitimate corporate restructuring after the developer has demonstrated genuine commitment via 3 years of development expenditure.
6.7 Financial security — option and lease caps
Per offer-document.md §3.5.4 Table 3:
| Intended Installed Capacity | Option Cap | Lease Cap |
|---|---|---|
| 100 to 500 MW | £5m | £7m |
| 500+ to 1,000 MW | £5m | £10m |
| 1,000+ MW | £5m | £15m |
The Option Cap is uniform at £5m regardless of project size — reflecting that during the Option Period, the financial exposure CES needs to secure against (decommissioning of survey equipment, etc.) is relatively small. The Lease Cap scales with project size (£7m–£15m) to cover decommissioning of larger constructed assets.
Acceptable forms: PCG (BBB- credit-rated guarantor or 20× net assets), LoC/Bond (A-grade bank), or cash deposit. Joint-and-several where multiple guarantors.
7. Qualification surface
7.1 Single-stage application — no separate PQQ
ScotWind has no separate prequalification stage. All qualification information is embedded in the single Application Form across Parts A–G:
- Part A — Applicant Identity (Lead and Sole Applicant / Lead Applicant + Project Partners, Capability and Experience Roles, the £/km² Applicant Valuation, requested Option Period, Project Team)
- Part B — Site (location within Plan Options, area, boundary)
- Part C — Project description (intended capacity, technology, installed-capacity density)
- Part D — Capability and Experience (project / corporate / individual experience, evidence)
- Part E — Funding (financial standing, funding capability)
- Part F — Health and Safety
- Part G — Preparedness (preparedness for the development period)
Each question is graded as part of the overall coarse grade (Band 1/2/3) and a subset contributes to the Detailed Numerical Score (0–450). Questions A7 (Valuation) and G2 (Preparedness) are excluded from coarse grading specifically because they have separate roles in the ranking waterfall.
7.2 Hard-edged eligibility limits
Beyond the scoring surface, several hard limits exclude an application outright:
- Plan Option containment — application area must be wholly within a single Plan Option (no straddling, no out-of-Plan)
- Single continuous boundary — no donut shapes, no multi-polygon
- Maximum 860 km² per application
- Minimum 100 MW intended capacity (per SMP commercial-scale definition)
- Minimum density ≥ 1 MW/km² of OA Area (ensures efficient seabed use)
- Maximum 5 applications per organisation in a Wind Farm Delivery Responsibility role (anti-portfolio-concentration)
- 5 km exclusion from existing pre-ScotWind offshore wind farm agreement boundaries unless consent obtained
Wind Farm Delivery Responsibility ("WFDR") is defined in
offer-document.md §4.4.7: an organisation listed as a Project
Partner, with direct or indirect equity ownership of the Tenant
Organisation, AND with a Capability and Experience role. A pure-
funding partner (no capability contribution) does not have WFDR.
At least one WFDR organisation must appear in every application
(rule §4.4.9.3-1) — the Applicant cannot be a vehicle that contributes
neither equity nor capability.
7.3 Capability and Experience — the qualitative core
Part D evaluates Relevant Experience contributed by the Lead/Sole Applicant or Project Partners across three categories:
- Project experience — up to 8 projects in the last 10 years (across all team organisations combined, not 8 per organisation)
- Corporate experience — gained within the last 5 years
- Individual experience — for individuals listed in the Question D5 Resource Plan; experience from any time period counted
Question D1 sits at the centre of the Detailed Numerical Score and is where the major scoring competition plays out between Band 3 / £100k applications.
7.4 Anti-double-counting on funding
offer-document.md §3.4 records:
"Whilst there is no specific limit on the number of applications that an organisation fulfilling an exclusively funding role may be involved with, the Guidance Notes highlight situations where a Funding Organisation which puts forward the same funding capacity or evidence of financial strength in support of more than one application will not have that aspect of its funding capability recognised in any application."
Practical effect: a major financial sponsor (e.g. an infrastructure fund) named on multiple applications cannot use the same balance sheet to cover total exposure across all of them. This forces applicants to demonstrate that funding capacity is genuinely separable across the portfolio — anti-paper-balance-sheet measure.
8. Scoring dimensions — what makes up the 0–450 Detailed Numerical Score
The Detailed Numerical Score is the competitive layer that does the
real work of separating Band 3 / £100k applications. Per the
worked example in offer-document.md Table 4, scores in the 200–448
range are typical for Band 2/3 applications that survive coarse
grading.
The detailed allocation across questions is set out in guidance-notes.md
(57 pages, mostly per-question rubric). The high-level structure:
- A subset of questions across Parts B, C, D, E, F, G feed into the Detailed Numerical Score
- Each scored question carries question-level weights set by CES (not bidder-selected)
- The 0–450 ceiling implies ~9 to ~15 weighted questions averaging 30–50 points each, depending on the exact rubric
- Coherence and consistency checks (
offer-document.md§5.2.6) test that responses "hang together" across the application — internal contradictions can drag scores down even if individual questions are strongly answered
Critically, the Detailed Numerical Score does not include either the SCDS (Question A13) or the Applicant Valuation (Question A7). It is essentially a deliverability and quality score focused on the team's ability to bring the project to construction-readiness within the Option Period.
The 0–450 score is high enough resolution to discriminate finely between strong applications (e.g. the worked example shows projects with scores of 448, 406, 406, 395, 347 — sufficient granularity to break ties between strong Band 3 applicants).
9. Tiebreak chain — the four-input waterfall is the tiebreak
There is no separate tiebreak procedure. The four-input ranking waterfall (§4.2) is the tiebreak, with the terminal Random Number guaranteeing a deterministic order even on full-stack ties.
Practical consequence: ScotWind has built chance into the award mechanism as a structural feature, not a fallback. For any two applications that both reach Band 3, both pick £100,000/km², and both score the same Detailed Numerical Score (e.g. on the 5-mark discretisation scale common to band-rubric scoring), the winner is determined by which Bidder happened to be assigned the higher Random Number when they registered. This is explicitly an ex-ante random allocation, not ex-post lottery — the Random Number is generated at Registration (which precedes application submission) and is invariant to bid strategy.
The contrast with US NY Bight's pseudorandom tiebreak (after maximising aggregate bid value) and Thor's physical lottery (between identical sealed bids on capacity-bounded site) is that ScotWind's tiebreak is systemic and continuous: every application's rank incorporates a random component, not just those that tie. The auction theory framing is the random number is the tiebreak only for ties on the higher inputs, but it is also a final ranking input for everyone — the rank is fully determined.
10. Revenue mechanism — null
ScotWind awards no revenue-support instrument. The Option Agreement and Lease confer site rights and obligation to pay Option Fee (one-off) + Lease rent (output-linked CPI-indexed); they do not confer a Contract for Difference, a feed-in premium, or any other regulated price-support contract.
Downstream pairing: ScotWind winners must compete in the UK Contracts for Difference Allocation Rounds (administered by DESNZ, contracted with LCCC, delivery body NESO) for revenue. This pairing is commercially essential, legally optional: a ScotWind winner can in principle hold the lease indefinitely, selling output via merchant routes or PPAs, without ever bidding for a CfD. In practice, the economics of UK offshore wind require CfD revenue support to reach FID, so ScotWind → CfD is a near- universal pipeline.
As of AR7 (results 14 January 2026): one ScotWind asset has won a CfD — Pentland Floating, 92.5 MW (Highland Wind, CIP-led) in Pot 4 (floating offshore wind) at £155.37/MWh (2012 prices) / £216.49/MWh (2024 prices). Pentland sits in Plan Option NE7 (the Pentland Firth area) and was one of the earlier-progressing ScotWind projects. Other ScotWind projects are still progressing through consenting and have not yet bid into CfD rounds.
11. Authorities and jurisdiction
| Function | Authority | Statutory basis |
|---|---|---|
| Seabed leasing | Crown Estate Scotland | Crown Estate Act 1961 (as devolved by Scotland Act 2016 + Crown Estate Transfer Scheme 2017) |
| Spatial planning | Scottish Government — Marine Directorate (formerly Marine Scotland) | Marine (Scotland) Act 2010 |
| Sectoral Marine Plan adoption | Scottish Ministers | Marine (Scotland) Act 2010 |
| Sponsoring government | Scottish Government — Cabinet Secretary for Net Zero, Energy and Transport | (Cabinet Secretary at award: Michael Matheson MSP) |
| Marine licensing (post-OA) | Marine Scotland Licensing Operations Team (now Marine Directorate Licensing) | Marine (Scotland) Act 2010 |
| Onshore consenting | Scottish Ministers via the Energy Consents Unit (s36 Electricity Act 1989) | Electricity Act 1989 |
| Grid connection | NESO (transmission); SP Transmission / SSE Transmission (Scottish TOs) | Electricity Act 1989; Energy Act 2013 |
| Downstream revenue contracts | DESNZ + LCCC + NESO (CfD) | Energy Act 2013 |
ScotWind's process is single-authority at the leasing stage (CES runs everything from Offer Document publication through Option Agreement execution), with multi-authority handoff at the post-award consenting stage (Marine Scotland for offshore licences, Scottish Ministers for s36 consent, NESO for grid).
12. Process and timeline
| Date | Event |
|---|---|
| 2017 | Crown Estate Scotland created (Crown Estate Transfer Scheme 2017) |
| 2018–2019 | Pre-launch consultations, design iteration |
| September 2019 | "ScotWind Leasing — Responses to Pre-Launch Feedback" published |
| June 2020 | Original Offer Document published (option-fee cap £10,000/km²) |
| March/April 2020 | Engagement document on proposed Supply Chain Development Statement |
| October 2020 | Sectoral Marine Plan for Offshore Wind Energy adopted by Scottish Ministers (the spatial framework for ScotWind) |
| 2020 (late) | Crown Estate Scotland statement on ScotWind leasing and COVID-19 — process delayed |
| January 2021 | Application window for registered Applicants opens |
| February 2021 | The Crown Estate Round 4 results published — option-fee bids £76k–£154k/MW/year revealed market exceeded ScotWind's original £10k/km² cap |
| March 2021 | Aurora Energy Research Rapid Review delivered (aurora-rapid-review.md) |
| April 2021 | Revised Offer Document published (option-fee cap raised 10× to £100,000/km²); Guidance Notes (April 2021) published; Model Option Agreement and Model Lease finalised |
| 3 June 2021 | Final Model Option Agreement issued |
| 04 June 2021 | Non-binding Intention to Apply messages sent via leasing portal |
| 11 June 2021 | Deadline for Intention to Apply responses |
| 18 June 2021 | Application fee invoices issued (£20,000 + VAT) |
| 25 June 2021 | Final clarification questions accepted |
| 09 July 2021 | All clarification responses released |
| 16 July 2021 | Closing Date for applications |
| 23 July 2021 | Confirmation to Registered Applicants of receipt + evaluability |
| August 2021 – January 2022 | Evaluation phase (~6 months) |
| 17 January 2022 | Initial-cohort results announced — 17 projects, £699.2m option fees, 24,826 MW |
| 18 January 2022 | Net Zero Secretary parliamentary statement (scotgov-statement-jan-2022.md) |
| 19 January 2022 | First Minister + Net Zero Secretary summit with successful applicants |
| April 2022 | Initial-cohort Option Agreements signed (per clearing-confirmed-nov-2022.md: "in April 2022") |
| 27 April 2022 | SCDS Outlooks for initial 17 projects published — £1.5bn/project initial commitment |
| April 2022 | Clearing process opens — NE1 area east of Shetland made available |
| 22 August 2022 | Clearing-cohort results announced — 3 floating projects (Ocean Winds, Mainstream, ESB), £56m option fees, 2,800 MW, ~560 km² |
| 02 November 2022 | Clearing-cohort Option Agreements confirmed signed — concludes ScotWind leasing round. Final totals: 20 projects, 27.6 GW, £755m option fees, £28.8bn aggregate Scottish supply-chain commitments |
| 2023 | SCDS updates published (per CES Aug 2023 SCDS update news); per-project average revised to £1.5bn |
| November 2023 | CES Briefing on ScotWind Leasing published (briefing-nov-2023.md) |
| 14 January 2026 | First ScotWind project wins a CfD: Pentland Floating (92.5 MW) clears AR7 Pot 4 at £216.49/MWh (2024 prices) |
13. Results
13.1 Initial cohort (17 January 2022, 17 projects)
Per results-jan-2022.md:
| Map ref | Lead applicant | Option Fees (£) | Technology | Capacity (MW) |
|---|---|---|---|---|
| 1 | BP Alternative Energy Investments | £85,900,000 | Fixed | 2,907 |
| 2 | SSE Renewables | £85,900,000 | Floating | 2,610 |
| 3 | Falck Renewables | £28,000,000 | Floating | 1,200 |
| 4 | Shell New Energies | £86,000,000 | Floating | 2,000 |
| 5 | Vattenfall | £20,000,000 | Floating | 798 |
| 6 | DEME | £18,700,000 | Fixed | 1,008 |
| 7 | DEME | £20,000,000 | Floating | 1,008 |
| 8 | Falck Renewables | £25,600,000 | Floating | 1,000 |
| 9 | Ocean Winds | £42,900,000 | Fixed | 1,000 |
| 10 | Falck Renewables | £13,400,000 | Floating | 500 |
| 11 | Scottish Power Renewables | £68,400,000 | Floating | 3,000 |
| 12 | BayWa | £33,000,000 | Floating | 960 |
| 13 | Offshore Wind Power | £65,700,000 | Fixed | 2,000 |
| 14 | Northland Power | £3,900,000 | Floating | 1,500 |
| 15 | Magnora | £10,300,000 | Mixed | 495 |
| 16 | Northland Power | £16,100,000 | Fixed | 840 |
| 17 | Scottish Power Renewables | £75,400,000 | Fixed | 2,000 |
| Totals | £699,200,000 | 24,826 |
Aggregate seabed: ~7,000 km² (out of 8,600 km² maximum — i.e. the National Limit was not the binding constraint). Applications received: 74.
13.2 Clearing cohort (22 August 2022, 3 projects, all in NE1)
Per clearing-results-aug-2022.md:
| Map ref | Lead applicant | Option Fees (£) | Technology | Capacity (MW) |
|---|---|---|---|---|
| 18 | Ocean Winds | £10,000,000 | Floating | 500 |
| 19 | Mainstream Renewable Power | £36,000,000 | Floating | 1,800 |
| 20 | ESB Asset Development | £10,000,000 | Floating | 500 |
| Totals | £56,000,000 | 2,800 |
Aggregate seabed: ~560 km² (out of 751 km² NE1 cap — partial use). Applications received: 14.
13.3 Final round totals
- 20 projects (17 initial + 3 Clearing)
- 27,626 MW total capacity (24,826 initial + 2,800 Clearing)
- £755,200,000 total option fees (£699.2m + £56m)
- ~7,560 km² total seabed (~7,000 km² + ~560 km²)
- £28.8bn aggregate initial Scottish supply-chain Commitments (per
clearing-confirmed-nov-2022.md) — average £1.4bn/project, £1bn/GW. Updated 2023 figure: ~£1.5bn/project average
13.4 Technology mix
- Floating-only: 12 of 20 projects (10 of 17 initial + all 3 Clearing) — accounting for ~14.6 GW of the 27.6 GW total
- Fixed-only: 7 of 20 projects (~12.6 GW)
- Mixed (fixed + floating): 1 project (Magnora, 495 MW)
This made ScotWind by some margin the world's largest commercial floating-offshore-wind round to that date — explicitly emphasised in the Net Zero Secretary's parliamentary statement: "ScotWind is by far the world's largest commercial round for floating offshore wind and breaks new ground in putting large-scale floating wind technology on the map at GW scale."
13.5 Successful Applicants — corporate concentration
- Falck Renewables: 4 projects (3, 8, 10, plus shared in others) — the most-awarded developer in initial cohort
- Northland Power: 2 projects (14, 16)
- Scottish Power Renewables (Iberdrola): 2 projects (11, 17)
- DEME: 2 projects (6, 7)
- Ocean Winds: 2 projects (9 initial + 18 Clearing)
- BP Alternative Energy Investments, SSE Renewables, Shell New Energies, Vattenfall, BayWa, Offshore Wind Power, Magnora, Mainstream Renewable Power, ESB Asset Development: 1 project each
The 5-applications-per-WFDR-organisation cap did not bind in the results (no organisation reached 5). The largest single award was SPR's 3,000 MW Project 11 (£68.4m option fee at floating technology).
14. Post-award developments
ScotWind project trajectories are still early — only ~4 years post- award as of 2026. Notable milestones:
- April 2022: Initial cohort signs Option Agreements
- 27 April 2022: SCDS Outlooks for initial 17 published (£25bn+ aggregate)
- August 2022: Clearing cohort offered Option Agreements
- November 2022: Clearing cohort signs Option Agreements; round closes
- 2023: SCDS updates published; per-project average revised upward to £1.5bn — consistent with intra-development tightening rather than slippage
- August 2023: CES "ScotWind Leasing Supply Chain Development Statements Updated" news release — confirms refined commitments
- AR7 (Jan 2026): First ScotWind project secures a CfD — Pentland Floating, 92.5 MW (Highland Wind / CIP) at the Pot 4 floating clearing price of £216.49/MWh (2024 prices). Pentland is in Plan Option NE7 (Pentland Firth) and was one of the smaller early-progressing initial-cohort awards (Map ref not directly matched — likely associated with Northland Power's Project 14 or 16, but the AR7 results document attributes the bid to a separate SPV; verify against AR7 writeup §13)
The dominant post-award narrative is slow consenting velocity vs the option-period clock. ScotWind awards have a maximum 10-year Option Period; first OAs were signed April 2022, so the latest permissible OE-to-Option-Notice deadline is April 2032. Most projects need 4–6 years from OA to consents-complete and 2–3 years from FID to COD, so the 10-year Option Period is comfortable for floating but borderline for the larger fixed-bottom projects (BP 2,907 MW at Map ref 1, Shell 2,000 MW floating, SPR 3,000 MW floating, etc.). Capacity-density commitments (1 MW/km² OA, 3 MW/km² Lease, with 500 MW initial-phase floor for >500 km² projects) constrain the build-up phasing.
There is no public record of any ScotWind Option Agreement having been terminated or surrendered as of April 2026, but several ScotWind projects appear in candidate-cancellation discussions (e.g. SSE's Berwick Bank decision impacts adjacent ScotWind projects, floating costs have escalated post-2022). This is the area of greatest near-term volatility.
15. Schema implications — what ScotWind adds beyond CE R4 / AR6 / Thor / DE / NYB / CE R5
Preliminary observations (to be sharpened in the validation summary and potentially drive v0.7 sketch revisions):
15.1 The "scored application with bidder-chosen capped valuation" pattern
ScotWind is not a sealed-bid auction in the textbook sense (no price discovery via competitive bidding); it is not a beauty contest in the textbook sense (price is one of the ranking inputs); it is not a hybrid auction-then-scoring like DE N-12.1 (where sealed price comes first, then dynamic ascending). The closest taxonomic label is "single-stage scored application with bidder-chosen capped valuation as one of N ranking inputs" or, more casually, "capped pay-the-cap-to-rank-high allocation".
v0.7 candidate revision: introduce a competition_mechanism enum
value covering this pattern explicitly. Current AuctionCompetitionMechanism
options (per the v0.6 sketch) include SEALED_BID, MULTI_ROUND_DYNAMIC,
APPLICATION_PROCESS, FIRST_COME_FIRST_SERVED, HYBRID. ScotWind
fits poorly under all of these:
- Not
SEALED_BIDbecause there is no price-discovery sealed bid; the £/km² is one input of four with a hard cap. - Not pure
APPLICATION_PROCESSbecause the discrete-level valuation IS a competitive scoring input. - Not
HYBRIDin the DE-N12.1 sense because there is no second stage.
Candidate new value: SCORED_APPLICATION_WITH_BIDDER_VALUATION or
MULTI_INPUT_RANKING_WITH_CAPPED_BID.
15.2 The four-input ordered ranking waterfall
This is a lexicographic ranking with explicit terminal random-number input. Axis 5 (tiebreak chain) in v0.6 supports an ordered list of tiebreak inputs, which can express ScotWind, but the schema currently treats Axis 4 (scoring dimensions) and Axis 5 (tiebreak chain) as separate sub-structures. ScotWind shows that the tiebreak chain IS the scoring: there is no separate "primary scoring" with "tiebreak fallback" — the four inputs are the ranking, full stop.
v0.7 candidate revision: clarify that an auction can populate Axis
4 with a single composite scoring expression OR populate Axis 5 with
the full ordered ranking expression (in which case Axis 4 is
applicability_status: not_applicable). ScotWind would populate
Axis 5 only.
15.3 The mandatory-but-not-scored-yet-contractually-binding bid component
The SCDS pattern (mandatory submission, not used in scoring of the auction itself, but written into the contract as binding obligations) is new in the pilot set. AR7's CIB is structurally different: CIB is a separate non-price competition that generates its own contracts and budget envelope. ScotWind's SCDS is a single component of the main bid that has dual treatment.
v0.7 candidate revision: extend Axis 1 (prize composition) to permit
non-scored contractual obligations as a sub-component of the
prize, distinct from the scored components and from Axis 4
(scoring dimensions). Could be expressed via a new
bid_components field on the Auction model carrying (component, mandatory_for_completeness, included_in_scoring, contractually_binding, update_cadence_post_award) for each component.
15.4 Two-cohort award structure (initial + Clearing) within a single auction
ScotWind's Clearing process is not a paired-auction relationship (no separate auction event with its own framework documents); it is not a re-run (the Clearing applications are revised, not re-scored unchanged); and it is not reaching back to first-round ranking (the Clearing methodology is the same scoring waterfall applied to revised applications). It is best characterised as a structured second-window within the same auction event, drawing only from previously-unsuccessful Band 2/3 Applicants and operating under the same evaluation methodology on a freshly-defined Clearing area.
v0.7 candidate revision: extend Axis 8 (process and timeline) to
permit multiple structured award rounds within the same auction
slug (auction.cohorts[]), each with its own cohort-level results,
cohort-level constraints (e.g. the 35 km consent rule that ScotWind
applied to Clearing), and cohort-level applicant-eligibility
restrictions. Distinct from paired_auctions (which is for separate
auction events).
15.5 Output-linked rent rather than fixed annual
ScotWind's lease rent is £/MWh of generation, not £/MW of capacity
per year. This is a third class of post-award payment structure beyond
"per-area" (CE R4 lease rent) and "per-time" (CE R4 AfL annual fee,
NY Bight $3/acre). v0.6's LeaseTermStructure supports the per-time
case; for ScotWind we may need an output_linked_rent_per_mwh
field with optional indexation parameters.
15.6 First Crown Estate Scotland pilot
AgentZero now has CE R4 / R5 (E&W&NI) and ScotWind (Scotland) as the three UK seabed-leasing pilots. The leasing-authority distinction matters for downstream analysis: ScotWind revenue flows to Scottish Government (Crown Estate Scotland is fully devolved), while CE R4/R5 revenue flows to the UK Treasury via The Crown Estate. Authority field on Auction model already supports this — but the parent organisation relationship between Crown Estate Scotland and the Scottish Crown Estate (the asset itself) may need a separate authority sub-record for full lineage. Also: ScotWind's spatial framework (the SMP) is adopted by Scottish Ministers, distinct from CES — a third authority in the chain.
15.7 Bidder-defined site polygon within a state-defined region
Per R24 (state_site_designation, v0.7), ScotWind clearly fits
region rather than specific_site: the 15 Plan Options are
state-defined polygons LARGER than a single bid unit, and bidders
draw their own application boundaries within them (subject to area,
density, and 5 km exclusion constraints). This is the same pattern
as CE R4 (Bidding Areas → developer-defined sub-projects), confirming
the region value applies cleanly across multiple pilots.
15.8 Coupled market-wide revenue instrument
Per R21 (v0.7), ScotWind's coupled_market_wide_revenue_instrument
is not populated — ScotWind winners must compete in CfD
Allocation Rounds (specific paired auctions, not a market-wide
automatic instrument like the Renewables Obligation). The Auction
model should populate paired_auctions with the relevant CfD ARs
(with cardinality "many" since ScotWind winners can in principle
bid into multiple AR rounds over the development period).
16. Open questions and verification queue
Items for the validation summary to confirm against primary sources:
- Lease term length —
model-form-lease.mddefines this. Need to extract from the Lease Term clause specifically (likely 60-year-equivalent, comparable to CE R4 Wind Farm Lease, but should not assume — the model lease document is in the corpus for verification). - Discrete valuation levels — confirm the exact pre-defined
menu of Applicant Valuation levels (£2,000 → £100,000 with
intermediate steps). The Aurora Rapid Review recommended "evenly-
spread intermediate price points with moderate size gaps"; need
to confirm what CES adopted (likely £2k, £6k, £10k, £20k, £40k,
£60k, £80k, £100k or similar — see the worked example in
offer-document.mdTable 4 which references £20k, £60k, £100k tiers). - Detailed Numerical Score weights — the per-question contribution
to the 0–450 score (across Parts B, C, D, E, F, G).
guidance-notes.mdhas the per-question rubric; need to extract the weights table. - Coarse Grade rubric — what specifically defines Band 1 vs Band 2 vs Band 3 across the question set.
- Reference to per-Applicant Valuations in published results —
confirm whether CES has published the actual Applicant Valuation
chosen by each winner (per
offer-document.md§7.3: CES "intend to publish the Applicant Valuations submitted for those applications which result in an Option Agreement being entered into" before the start of the second cycle of ScotWind Leasing). If published, this would let us verify which winners selected which valuation level — a strong test of the "everyone picks the cap" hypothesis. - Sectoral Marine Plan amendment status — the SMP is iterative (a Draft Updated SMP for OWE was consulted on in May 2025); need to flag whether the 2020 SMP that ScotWind ran against is still the operative version for any second-cycle leasing.
- Pentland Floating attribution — the AR7 results attribute Pentland Floating to "Highland Wind" (CIP-led). Confirm which of the 20 ScotWind projects (likely Northland Power's Project 14 or the Magnora Mixed Project 15) feeds Pentland Floating, including the corporate transfer history if any (Northland → Highland Wind? or original CIP/Highland project?). This is the link to Pentland in the AR7 winners list.