Six Lessons from Three Decades of Renewable Energy Investing
Authored by: Marcus Wolter and Lukas Kratochvil
China’s Belt and Road programme pushed green energy financing to a record $20.1bn in the first half of 2026, exceeding the whole of 2025 in just six months.1 The immediate catalyst was the war in Iran: oil and gas prices spiked, renewables looked cheaper by comparison, and capital moved. Nothing about the economics of a wind turbine changed in the meantime. However, that has long been one of the defining features of the sector: renewable energy investment has repeatedly been pulled and pushed by geopolitics, policy shifts and macroeconomic shocks, producing an investment landscape that often bears little resemblance to the underlying economics. So the pattern is familiar; the details change, but the lessons do not. Here are some consistent conclusions we can draw.
1. Underwrite the asset, not the subsidy.
A feed-in tariff is a political instrument with a political lifespan. Spain proved it: generous support introduced in 2007 made the country responsible for roughly half the world’s new solar capacity in 2008, before the framework was dismantled retroactively from 2013.2 More than fifty intra-EU Energy Charter Treaty claims followed, seeking over $10bn. By the 2024 compliance report, Spain had become the most non-compliant state in the world in respect of investment treaty awards: twenty-four remained unpaid, with at least $1.5bn outstanding, in addition to approximately $350m in interest and legal fees.3
A favourable award and a paid award turned out to be different things; a distinction rarely encountered in treaty arbitration. Investors therefore need to undertake the difficult exercise with their advisors of pricing regulatory and political risk explicitly. Treaty protections can no longer be assumed to provide a reliable backstop.
2. Predictability is cheaper than generosity.
The UK’s fifth Contracts for Difference allocation round in 2023 set an administrative strike price of £44/MWh, based on cost modelling that pre-dated the inflation in steel, turbine manufacturing and interest rates. It received no offshore wind bids.4 The seventh round, announced in January 2026, secured a record 8.4GW, a remarkable outcome given that approximately 16.5GW had been procured across all six previous rounds combined.5 The single change most widely credited with the turnaround was extending the contract term from fifteen years to twenty, which improves debt cover and lifts project IRR without raising the headline subsidy.6 Governments procuring generation capacity should note which lever made the difference.
3. Most renewable energy “crashes” are de facto interest rate repricing.
The economics of renewable energy projects are unusually sensitive to the cost of capital. The costs are overwhelmingly incurred upfront, making valuations heavily dependent on discount rates.
When interest rates rose from near zero to restrictive levels between 2021 and 2023, portfolios were repriced accordingly. The markets interpreted this as a verdict on renewable energy technology. It was, in reality, a verdict on financing assumptions.
4. Markets reward consistency not direction.
Some of the strongest corporate performers of the past decade occupy opposite ends of the energy transition debate.
ExxonMobil never abandoned its hydrocarbons strategy, earning $28.8bn in 2025 while distributing $37.2bn to shareholders.7 Iberdrola has pursued the same networks-and-renewables strategy since 2001 and reports total shareholder return of 340% over the decade to 2025, compared with 210% for the three largest US utilities and 165% for the IBEX 35.8 TotalEnergies likewise held its course, doubling electricity output since 2021, lifting return on average capital employed within Integrated Power to around 10%, and delivering close to a tenth of group operating cash flow from that business.9
The weaker performers have generally been the companies that repeatedly changed direction BP has executed effectively the same strategic U-turn twice in twenty-five years: “Beyond Petroleum” in 2001, net zero in 2020, and a strategic reset in February 2025.10 From 1 July 2026 it replaced its three reporting segments with two, Upstream and Downstream, while moving solar and offshore wind into its Technology function as it pursues a more capital-light model in those areas.11 Its chairman had been dismissed weeks earlier, less than a year into the role, over governance and conduct concerns.12
Equinor halved renewables investment in February 2025 and recorded a $1.6bn renewables operating loss for the year, including $1.4bn of impairments largely related to Empire Wind.13
Both expanded aggressively near the top of the cycle before retreating near the bottom. The market did not penalise a direction; it charged for strategic uncertainty - twice!
5. Consistency only matters if it earns returns.
Ørsted has arguably been the most strategically consistent operator in the sector and yet has been punished the hardest: its share price is down around 85% from its January 2021 peak,14 having raised roughly €8bn in a rights issue priced at a 66.7% discount.15
China’s solar champions tell the same story from the other side of the value chain: JinkoSolar, Longi, Trina and JA Solar all posted net losses in the first quarter of 2026, with Longi running a negative gross margin, after two decades of unwavering state backing.16
Consistency compounds where it builds a durable position: a lower cost of capital, an installed base, a regulated earnings floor. It destroys value where it simply means continuing to spend.
6. The fundamentals move in a straight line.
The International Energy Agency (IEA) expects global energy investment of around $3.4tn in 2026, with around $2.2tn allocated to clean energy compared to $1.2tn for oil, gas and coal.17 Electricity supply and infrastructure alone account for $1.6tn, rising to around $2tn (including end-use electrification),18 while solar investment is running at roughly $1bn a day and oil supply spending is set to fall for a third consecutive year.19
Over the past decade, the costs of solar photovoltaics (PV), battery storage and electric vehicles have fallen by around 80%. Building 1GW of solar capacity now requires about $0.7bn of investment compared to $3bn in 2015.20 In 2025, renewables generated 33.8% of global electricity, overtaking coal at 33.0% for the first time in roughly a century.21
Learning curves do not reverse when market sentiment does.
The practical implication for investors, lenders and advisers is straightforward: the cycle is where the opportunities emerge. Farm-downs, distressed disposals, terminated leases and distressed manufacturing capacity tend to arrive simultaneously, transferring assets from companies abandoning a strategy to those prepared to maintain one.
Renewable energy will almost certainly fall in and out of political favour again.
Commodity prices, elections and interest rates will continue to drive sentiment. The underlying economics, however, are considerably more durable. Those able to distinguish between cyclical dislocation and structural change are usually the ones buying from those who cannot.
References
1. Financial Times, “China pours funding into green energy deals as Iran war hits oil demand”, 26 July 2026, reporting the China Belt and Road Initiative Investment Report 2026 H1 (C. Nedopil Wang). Underlying report series: greenfdc.org — Belt and Road Initiative reports
2. EU Reporter, “Spain’s refusal to settle arbitration in renewables…”, on the 2007–08 support scheme and the retroactive cuts of 2013. eureporter.co
3. N. Lavranos, “Spain Tops the Ranking as the Most Non-compliant State”, Kluwer Arbitration Blog, on the 2024 Report on Compliance with Investment Treaty Awards. legalblogs.wolterskluwer.com
4. Energy UK, “Allocation Round 6 and the UK’s energy security goals” (AR5 administrative strike price and zero offshore wind bids). energy-uk.org.uk
5. Energy UK, “Allocation Round 7 offshore wind results”, January 2026 (8.4GW secured; 16.5GW across the previous six rounds). energy-uk.org.uk
6. Renewable Energy Institute, “UK CfD Allocation Round 7: Reassessing the Results” (extension of the CfD term from 15 to 20 years as the decisive factor). renewable-ei.org
7. ExxonMobil, “ExxonMobil Announces 2025 Results”, 30 January 2026 ($28.8bn full-year earnings; $37.2bn distributed). corporate.exxonmobil.com
8. Iberdrola, 2026–2028 Transformation Plan (total shareholder return 2015–2025: Iberdrola 340%, US utilities 210%, Euro STOXX Utilities 208%, IBEX 35 165%). Company-reported figures. iberdrola.com
9. Wood Mackenzie, “Power moves: TotalEnergies’ Integrated Power strategy assessed” (electricity output doubled since 2021; ROACE lifted to 10%; near a tenth of group operating cash flow). woodmac.com
10. R. Rapier, “Why Big Oil Is Backing Away From Renewables”, Forbes, 21 June 2026 (BP’s February 2025 reset; Shell’s selective retreat toward LNG and trading). forbes.com
11. bp, “bp simplifies organizational structure and announces leadership appointments”, 9 June 2026 (two segments from 1 July 2026; solar and offshore wind moved into the Technology function; external reporting on the old three-segment basis until 31 December 2026). bp.com
12. Offshore Technology, “BP announces two-segment overhaul to simplify operations”, June 2026 (dismissal of chairman Albert Manifold after less than a year, over governance, oversight and conduct concerns). offshore-technology.com
13. reNews, “Equinor posts $1.6bn renewables operating loss”, March 2026 (including $1.4bn of impairments, mainly Empire Wind and the South Brooklyn Marine Terminal). renews.biz
14. Reuters via Baird Maritime, “Struggling Orsted prices rights issue at steep 66.7 per cent discount” (shares down 85% from the January 2021 peak). bairdmaritime.com
15. Ørsted, “Completion of rights issue and strong execution of business plan”, November 2025. orsted.com
16. pv magazine, “Chinese PV Industry Brief: JinkoSolar, Longi, Trina Solar, JA Solar post Q1 losses”, 8 May 2026 (all four lossmaking; Longi gross margin −1.19%; Trina’s loss narrowed 78.6%). pv-magazine.com
17. IEA, World Energy Investment 2026 — regional dashboards ($3.4tn total energy investment in 2026; $2.2tn clean energy, almost double fossil fuels). iea.org
18. IEA, World Energy Investment 2026 launch presentation, 28 May 2026 (electricity supply and infrastructure investment of $1.6tn in 2026, rising to $2tn including end-use electrification). iea.org (PDF)
19. TaiyangNews on IEA data, “IEA Projects $1bn/Day Global Solar Investment In 2026”. taiyangnews.info
20. IEA, World Energy Investment 2026 (full report): EV, battery storage and solar PV costs down around 80% over the decade; 1GW of solar PV now around $0.7bn against $3bn in 2015; a third consecutive year of lower oil supply spending. iea.org (PDF)21. Ember, Global Electricity Review 2026 (renewables 33.8% of global generation in 2025 against coal at 33.0% — the first time in around a century). ember-energy.org
Figures were checked against the primary source where one exists (company announcements, IEA, Ember, Energy UK). Iberdrola’s total shareholder return comparison is the company’s own presentation of the data. All sources accessed 26 July 2026.
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