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Q4 2026  |  Develop, Sell or Hold · Part 1 of 4  |  Solar & Storage

Where Projects Stall: The Solar and Storage Bottlenecks That Got Worse

In the United States the binding constraint has moved from the grid to Washington. In Europe it is the grid itself, and the shrinking revenue a crowded grid leaves behind. What changed over the last two years, and what it means for how projects are valued.

Odette CapitalOctober 20269 min read
97 GWU.S. solar and storage across 445 projects at risk from federal permitting reviewSEIA, Jul 2026
>5 yrsMedian U.S. wait from interconnection request to commercial operationBerkeley Lab, Jul 2026
211 GWBattery connection requests at German TSOs, against 41 GW of storage needed by 2037Modo Energy, Apr 2026
12%Share of Spain’s 2025 grid-access requests that were approvedAelec, Dec 2025

Two years ago, a developer asked where its utility-scale solar or battery project was most likely to stall would have given the same answer on both sides of the Atlantic: the interconnection queue. That answer no longer holds in the United States, and in Europe it understates the problem.

The U.S. bottleneck is now political and legal, and could reverse with a ruling or an election. Europe’s is physical and economic, and will take a grid build-out cycle to clear. Higher interest rates since September 2026 are a new headwind for both.

This first part of our series looks at six constraints on utility-scale solar and storage development — interconnection, permitting, equipment and trade, tax-credit qualification, construction cost, and financing and revenue — and asks which have deteriorated most since late 2024. Parts 2 to 4 follow the consequences through to asset sales, pipeline valuation and the decision to hold rather than sell.

Scorecard: what got worse, and where

ConstraintUnited StatesEurope
PermittingWorsened sharplyFederal sign-off regime since July 2025; 97 GW at riskNot bindingAcceleration areas lag, but permits are not the scarce input
Grid accessChronicQueue down 10%, but waits now exceed 5 yearsWorsened sharplyQueues have become hard caps in Spain, Germany, Poland and Italy
Tax creditsWorsenedSolar construction deadline passed; FEOC rules raise storage costsNot applicableSupport runs through auctions and contracts for difference
Equipment & tradeWorsenedNew duties, Section 232 floor prices, FEOC premiumImprovedStorage capex down sharply; modest module uptick in 2026
Construction costWorsenedSystem prices rising despite cheaper modules; transformer lead times over two yearsMixedCheaper equipment offset by connection and installation costs
Financing & revenueWorsened lateFed hike in Sept 2026; ERCOT battery revenue down 85% since 2023Worsened sharplySolar cannibalisation, falling battery revenue, ECB hikes

Odette assessment of direction of change from Q4 2024 to Q4 2026, based on the sources cited below.

United States

Permission, not the queue, became the binding constraint

The largest new obstacle for U.S. developers is federal permission. A July 15, 2025 Interior Department directive requires the Secretary’s personal sign-off on nearly 70 permit and action types for solar and wind. A secretarial order in August 2025 added a “capacity density” test, and in September 2025 the Army Corps deprioritised Clean Water Act Section 404 permits for both technologies. Any project with a federal nexus — public land, a wetlands permit, a protected-species consultation — now runs through that process.

The effect has been close to a freeze. Only one renewable project on Bureau of Land Management land advanced between July 2025 and January 2026. By July 2026, SEIA counted 445 solar and storage projects totalling 97 GW at risk from the review regime. A federal court enjoined the five Interior and Army Corps actions on April 21, 2026, but the injunction covers only the plaintiffs and their members, and Interior has said it will appeal.

Local opposition is adding to the attrition rather than replacing it. Columbia’s Sabin Center counts 888 state and local restrictions on renewable projects. Contested projects totalling about 9.8 GW were cancelled in 2025, three times the previous annual high, although the pace of new local restrictions has slowed since 2023.

The tax credit is now a compliance exercise

The One Big Beautiful Bill Act, signed July 4, 2025, required wind and solar projects to begin construction by July 4, 2026, or be placed in service by the end of 2027, to claim the technology-neutral credits. Treasury then tightened what “begin construction” meant, before a court reversed it weeks before the deadline.

From the OBBBA to the placed-in-service cliff

Key federal tax and trade dates for U.S. solar and storage developers

  1. Jul 4, 2025OBBBA signed. Solar and wind must begin construction by July 4, 2026, or be in service by December 31, 2027. Storage keeps the full credit for construction starting through 2033.
  2. Aug 15, 2025Notice 2025-42 removes the 5% cost safe harbor for solar above 1.5 MW, leaving only the physical work test.
  3. Feb 12, 2026Notice 2026-15 sets interim FEOC “material assistance” thresholds: at least 40% non-prohibited cost share for generation and 55% for storage, rising to 60% and 75%.
  4. Jun 6, 2026A federal court vacates Notice 2025-42, restoring the 5% safe harbor 27 days before the deadline. The government did not appeal by August 5.
  5. Jul 4, 2026Begin-construction deadline for solar and wind.
  6. Dec 4, 2026Section 232 polysilicon tariff takes effect, with minimum import prices of $0.38/W for modules and $0.22/W for cells.
  7. Dec 31, 2027Placed-in-service cliff for solar and wind projects that did not begin construction in time.
Sources: Arnold & Porter; Vinson & Elkins; EY; Norton Rose Fulbright; Clifford Chance; GHY International.

The near-term build is protected. Wood Mackenzie estimates that 216–240 GWdc of utility-scale solar was safe-harboured between mid-2024 and the deadline, and SEIA and Wood Mackenzie expect safe-harboured pipelines to support about 44 GW of installations a year through 2030. The pressure falls on what comes after: solar projects that did not start in time, and storage projects that must now prove their supply chain.

For storage, the foreign-entity rules have become the main cost driver. Anza estimates that FEOC-compliant battery systems carry a premium of $70–80/kWh, and up to $150–200/kWh for some configurations, and some developers are choosing to forgo the investment tax credit rather than comply. The credits themselves have also lost value. Transfer volumes fell 12.5% year on year to $21 billion in the first half of 2026, and investment tax credits for solar and storage now trade at 90–93 cents on the dollar, with technology-neutral credits at 88–91 cents.

Equipment and construction: higher costs, higher floor

Turnkey battery storage system prices, 2025

US$ per kWh, BloombergNEF annual survey

United States $219 Europe $177 China $73
Source: BloombergNEF energy storage system cost survey, December 2025. The global average was $117/kWh, down 31% year on year.

U.S. projects pay a structural premium for equipment, and trade policy is raising the floor. Final anti-dumping and countervailing duty determinations on cells and modules from India, Indonesia and Laos, issued on September 11, 2026, set combined rates as high as 268%. The Section 232 polysilicon proclamation adds a 15% tariff and minimum import prices from December 4. Module prices are already high: Anza’s Q1 2026 U.S. median was $0.28/W, and $0.46/W for modules built with U.S.-made cells.

Tariff policy also remains unsettled. The Supreme Court struck down the IEEPA-based tariffs on February 20, 2026. A temporary 10% tariff under Section 122 replaced them, the President announced plans to raise it to 15%, and further action under Sections 232 and 301 has been signalled. For imported Chinese battery systems, the all-in tariff stack is therefore uncertain, and developers are pricing that uncertainty into procurement.

Balance-of-system costs are rising too. SEIA and Wood Mackenzie put single-axis tracker system prices at $1.06/W in Q2 2026, up 2% year on year even though modules got cheaper, with logistics costs up about 15% on higher oil and gas prices. Lead times are about 128 weeks for power transformers and 144 weeks for generator step-up units, and power transformer prices are up 77% since 2019.

Interconnection: chronic, not newly worse

The U.S. queue has passed its peak. Berkeley Lab’s Queued Up 2026 counts 2,061 GW of active requests at the end of 2025, down 10% on the year, after more than 750 GW withdrew. But time to market keeps lengthening: the median project now waits more than five years from request to commercial operation. The mix is also shifting away from solar. Queued solar fell 19% in 2025, while queued gas rose 86%.

PJM’s first reformed queue cycle

Capacity submitted to Cycle 1 by technology, GW (total about 220 GW across 811 projects)

Gas 105.8 Standalone storage 66.5 Solar 14.8 Solar + storage 8.9
Source: POWER Magazine, April 30, 2026, on PJM Cycle 1 submissions (deadline April 27, 2026). Remaining capacity is wind and other technologies. Final agreements for this cohort are expected around 2028.

Financing and revenue: the late-breaking deterioration

Until mid-2026 the financing story was benign. Construction loans priced around SOFR plus 150 basis points, and Norton Rose Fulbright reported spreads about 12.5 basis points tighter year on year going into 2026. The change has come through base rates. The Federal Reserve raised its target range by 25 basis points to 3.75–4.00% on September 16, 2026, its first increase since 2023, and the 10-year Treasury yield stood above 5.2% in mid-October.

ERCOT battery revenues

US$ per kW-year, fleet average

$193 $56 $29 2023 2024 2025
Source: Modo Energy, February 2026. Ancillary service prices fell as more batteries entered the market, pushing revenue toward energy arbitrage.

Revenue risk is concentrated in merchant storage. ERCOT shows what happens when a fast-growing battery fleet meets a thin ancillary services market. Revenues fell 85% in two years as batteries moved into energy arbitrage. Solar PPA prices are also softening: LevelTen’s North American solar index fell 4.8% quarter on quarter in Q2 2026, to $61.40/MWh, its first fall in two years.

Europe

The queue has become a cap

In Europe the grid is no longer a waiting line that projects move through, slowly. In the busiest markets there is simply no capacity left to allocate.

Battery connection requests versus system need

GW

GERMANY TSO requests 211 Need by 2037 41 UNITED KINGDOM Gate 2 batteries 83 CP30 need ~30
Sources: Modo Energy, April 2026 (Germany, TSO requests as of September 2025); Knight Frank, December 2025, on NESO connections reform results (UK). DESNZ and Ofgem put the UK surplus at 14.8 GW above the upper end of the Clean Power 2030 range, after later attrition.
MarketState of grid access
Spain4.5 GW of about 40 GW of 2025 access requests approved (12%). REE reports 99% of roughly 200 GW of grid capacity blocked, with access now allocated by tender.
GermanyOnly 39 of 426 transmission nodes accept batteries, all with dates after 2030. TSOs replaced first-come-first-served with a maturity-based procedure in 2026.
ItalyTerna held 268 GW of standalone storage requests and 144 GW of solar requests at March 31, 2026.
PolandAvailable capacity reads zero at every 110 kV substation. The queue exceeds 240 GW against 33 GW in operation.
UKConnections reform gave Gate 2 status to 283 GW of generation and storage from a 722 GW queue. Government and Ofgem now aim to push surplus batteries out.
NetherlandsNon-firm contracts are the workaround: TenneT says they have unlocked 9.1 GW.

A widely quoted figure of 1,700 GW for Europe’s total grid backlog has no identifiable primary source. Ember’s more conservative count is almost 700 GW of renewables in connection queues across eight reporting countries, plus more than 340 GW across eleven countries that holds agreements but is not yet online.

Revenue: a crowded grid pays less

Where the grid is full of solar, solar earns less. Spain recorded 397 hours of negative wholesale prices in the first quarter of 2026 alone, compared with 48 in the same quarter of 2025 and 555 in the whole of 2025. Spain does not compensate technical curtailment. In Germany, solar captured 29.7% of the average market price in May 2025, a record low, and new German PV earns no feed-in support in any interval with a negative price.

Negative-price hours in Spain

Hours

48 555 397 Q1 2025 Full-year 2025 Q1 2026
Source: pv magazine, June 17, 2026. One quarter of 2026 produced more than 70% of all the negative-price hours seen in 2025.

The contract market has moved accordingly. Pexapark reports that standalone solar PPA volumes fell 42% in the first half of 2026, while flexibility contracts such as battery tolls and revenue floors rose 182%. In Spain, DLA Piper reports lenders facing coverage-ratio breaches and cash lock-ups, and renewable M&A deal count fell 30% in 2025.

Batteries are not immune. German battery revenue was €191k/MW-year in August 2026, 15% below a year earlier, as secondary reserve (aFRR) capacity prices fell by about half. Lenders now haircut merchant revenue forecasts by up to 30% and push for tolls or floors, and a draft regulatory proposal of August 2026 would add a grid fee of about €5/kW-year for batteries that miss grandfathering. Where storage is contracted, prices are competitive: Italy’s first MACSE auction awarded 10 GWh at an average €12,959/MWh-year, about a third of the reserve price.

Rates have risen here too. The ECB raised its deposit rate in June and again in September 2026, to 2.50%, and the 10-year Bund reached 3.55% on September 16, its highest since 2009.

What is not the problem in Europe

Two constraints that dominate the U.S. debate matter less in Europe. Permitting is slow but is not the scarce input: in Spain, Italy and Poland the queue problem is too many permitted or speculative projects, not too few permits. EU-mandated renewables acceleration areas are behind schedule, with none of eleven member states tracked by CAN Europe having designated them ahead of the February 2026 deadline.

Equipment has become cheaper. BloombergNEF’s turnkey storage system price for Europe fell from about $275/kWh in its 2024 survey to $177/kWh in 2025. Module prices rose in 2026 from record lows after China removed its export VAT rebate on April 1 and silver prices climbed, with the pvXchange high-efficiency index up from €0.115/Wp in January to €0.150/Wp in May, but that does not change the direction of travel.

What it means for valuation and M&A

The bottlenecks that worsened most are the ones buyers now underwrite first. In the U.S., value has concentrated in projects that are permitted, safe-harboured and hold signed interconnection agreements; solar projects starting construction after the deadline carry a policy discount. In Europe, the grid connection itself has become the scarce asset, and a firm connection date before 2030 is often worth more than the project’s other attributes combined. Part 2 looks at what buyers are paying for each.

In the model

  • Run a separate case for losing the credit, with the FEOC cost premium and higher equipment prices included.
  • Price U.S. storage equipment under more than one tariff stack until the Section 122, 232 and 301 position settles.
  • Haircut European merchant solar revenue with capture rates and negative-price hours that reflect the 2026 run rate, not 2023.
  • Test battery cases against saturating ancillary markets, using ERCOT and German aFRR as the reference path.

In diligence

  • Does the project have a federal nexus (BLM land, Section 404, species consultation) that routes it through Interior review?
  • What evidence supports the begin-construction position, and does it survive the continuity requirement?
  • Can the supply chain be documented to the FEOC material-assistance thresholds?
  • In Europe, is the connection firm or non-firm, and what is the contracted energisation date?

Bottom line. U.S. developers face a policy bottleneck that could ease as quickly as it arrived, but until it does, permission and tax-credit status decide value. European developers face a structural one: full grids and falling capture prices that only grid investment and flexible capacity will fix. On both sides, higher rates now make every delay more expensive.

Data as of October 15, 2026. Figures are from the public sources listed below; where sources conflict, we use the more conservative figure. Market characterisations are directional and change with each rule cycle and court decision. This piece is for informational purposes only and does not constitute investment, tax or legal advice.

Sources
  1. SEIA estimate of projects at risk from Interior review (July 2026), via TaiyangNews, Aug 24, 2026. Link
  2. Canary Media, “22 GW of renewables under Trump blockade,” Jan 16, 2026. Link
  3. McGuireWoods, preliminary ruling blocking wind and solar restrictions, May 14, 2026. Link
  4. Heatmap, Interior appeal statement, May 13, 2026. Link
  5. Sabin Center data via pv magazine USA, Sept 8, 2026. Link
  6. Arnold & Porter, “From IRA to OBBBA,” July 2025. Link
  7. Vinson & Elkins on Notice 2025-42, Aug 2025, and on its vacatur, June 8, 2026. Link
  8. Clifford Chance, Notice 2025-42 appeal deadline, Sept 4, 2026. Link
  9. EY Tax News on Notice 2026-15, Feb 17, 2026. Link
  10. Wood Mackenzie, “The state of safe harbouring,” Apr 1, 2026. Link
  11. SEIA/Wood Mackenzie Solar Market Insight Q3 2026, via pv magazine, Sept 11, 2026. Link
  12. Energy-Storage.news on developers forgoing the ITC (Anza data), June 2, 2026. Link
  13. Crux transfer market data via PV Tech, Aug 18, 2026. Link
  14. Utility Dive on tax credit pricing (RCM Q3 2026), Sept 16, 2026. Link
  15. BloombergNEF storage system cost survey via Energy-Storage.news, Dec 16, 2025, and Feb 5, 2025. Link
  16. PV Tech on final AD/CVD determinations for India, Indonesia and Laos, Sept 2026. Link
  17. GHY International on the Section 232 polysilicon proclamation, Aug 7, 2026. Link
  18. Anza Q1 2026 module pricing via pv magazine USA, Apr 3, 2026. Link
  19. Ropes & Gray on the Supreme Court IEEPA ruling, Feb 2026; Morgan Lewis on storage tariff risk, Mar 2026. Link · Link
  20. SEIA/Wood Mackenzie system pricing via Now.Solar, Sept 24, 2026. Link
  21. POWER Magazine, “Transformers in 2026,” Jan 2, 2026. Link
  22. Berkeley Lab, Queued Up 2026 release, July 1, 2026. Link
  23. POWER Magazine on PJM Cycle 1, Apr 30, 2026. Link
  24. Norton Rose Fulbright, Cost of Capital: 2026 Outlook, Jan 29, 2026. Link
  25. Federal Reserve FOMC statement, Sept 16, 2026; FRED 10-year Treasury series. Link · Link
  26. Modo Energy on ERCOT battery revenues, Feb 3, 2026. Link
  27. LevelTen PPA indices via PV Tech, July 23, 2026. Link
  28. Modo Energy on German battery grid access, Apr 9, 2026. Link
  29. Knight Frank on UK connections reform, Dec 11, 2025; DESNZ and Ofgem open letter, Apr 2026. Link
  30. Aelec data via Forbes España, Dec 22, 2025. Link
  31. Ember, Crossed wires, Apr 1, 2026. Link
  32. pv magazine on Terna’s queue, Apr 16, 2026. Link
  33. Modo Energy on Poland’s grid queue, Apr 4, 2026. Link
  34. Renewable Energy World on the unsourced 1,700 GW figure, Aug 28, 2026. Link
  35. pv magazine on Spain’s negative-price hours, June 17, 2026. Link
  36. S&P Global on German solar capture prices, June 10, 2025. Link
  37. Pexapark, H1 2026 review. Link
  38. DLA Piper on distressed M&A in Spanish renewables, July 1, 2026. Link
  39. Modo Energy German BESS benchmark, Sept 11, 2026; Energy-Storage.news, Aug 11, 2026; HSF Kramer on German grid fee reform, 2026. Link · Link · Link
  40. ESS News on Italy’s first MACSE auction, Oct 1, 2025. Link
  41. ECB key interest rates; Trading Economics on the 10-year Bund, Sept 16, 2026. Link · Link
  42. CAN Europe acceleration areas tracker. Link
  43. pvXchange data via EMA Energiewelt, May 26, 2026; SolarQuarter on China’s export rebate changes, Jan 10, 2026. Link · Link

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