Clean Energy Hits a Wall—In India

India lost 300 GWh of renewable energy in the first quarter of 2026 due to transmission constraints —enough to power 5 million urban households for a day, according to Ember. Out of recently commissioned renewable capacity totaling 54.8 GW, only 33% of power was being evacuated as of May 2026 , rating agency ICRA reported. The country is building solar and wind farms faster than it can wire them to the grid, and the mismatch is starting to cost real money.

Around 20 GW of renewable projects expected in fiscal 2026-27 could face connectivity delays exceeding four months, with Rajasthan alone accounting for more than 12 GW of solar and wind projects facing such delays , Ember estimated. The problem is structural: India has delivered only about 80% of its annual transmission targets over the past five years, and the fiscal 2026-27 interstate transmission target has now risen to 25,146 circuit kilometres . One in four major transmission schemes is already delayed by at least a year.

Can Batteries Bridge the Gap?

Roughly 3 GW to 4 GW of two-hour storage could have absorbed most of the curtailed generation, against 236 GW of plug-and-play battery energy storage system headroom already available at major pooling stations , Ember's Duttatreya Das told PV Magazine. The technical pieces are in place; the regulatory framework is not. Proposed measures include allowing battery storage to function as a transmission asset and creating a government-backed intermediary to aggregate power from projects operating under temporary grid access .

The curtailment isn't just a technical inconvenience. Plants connecting under temporary general network access earn no compensation when curtailed, and a 6- to 12-month delay can cut project internal rate of return by 100 to 200 basis points . For developers, that's the difference between a viable project and a stranded asset.

Contrast that with the United States, where power plant developers plan to add 86 GW of new utility-scale electric generating capacity in 2026, with solar making up 51%, battery storage 28%, and wind 14% , the EIA reported. Developers plan to add a record 24 GW of utility-scale storage in 2026, a massive jump from the 15 GW added last year . Battery prices have fallen to $70 per kilowatt-hour, according to ENACT—a new record low that is accelerating deployment across residential, commercial, and utility-scale projects.

Why Nuclear Is Back in the Conversation

The AI boom is rewriting the rules for baseload power. Global data centers consumed about 415 terawatt-hours of electricity in 2024, enough to power all of Japan for a year, and this figure is forecast to grow to 800 TWh by 2026 , according to Carbon Credits. The team at Goldman Sachs forecasts 85 to 90 GW of new nuclear capacity would be needed to meet all of the data center power demand growth expected by 2030, but well less than 10% will be available globally by 2030 .

That hasn't stopped Big Tech from signing deals. Microsoft inked a 20-year agreement to restart the Three Mile Island nuclear plant, which has been offline since 2019, OilPrice.com reported. Amazon paid $650 million for a data center campus in Pennsylvania directly powered by the adjacent Susquehanna nuclear station. The Trump administration recently announced over $17 billion in federal loans to revitalize the nation's aging nuclear fleet, though OilPrice.com noted the move "won't fix what's really broken"—namely, the regulatory and construction timelines that stretch well into the 2030s.

This timing mismatch means that even as tech companies tout plans for nuclear power, they'll actually be relying largely on fossil fuels, keeping coal plants open, and even building new natural gas plants that could stay open for decades , MIT Technology Review warned. Natural gas is currently the biggest source of electricity for data centers in the United States with over 40%, and as demand growth is particularly rapid over the next five years, natural gas is the largest source of additional supply, adding over 130 TWh of annual generation until 2030 , the IEA reported.

Meanwhile, sodium-ion batteries are quietly entering the residential storage market. Unigrid launched first-generation sodium-ion residential energy storage systems this week, according to a PV Magazine headline. The technology uses abundant sodium instead of lithium, offering better thermal stability and lower fire risk, though energy density remains lower than lithium-ion equivalents. It's a hedge against supply chain concentration and a sign that the storage market is diversifying beyond a single chemistry.

What Changed This Week

India's renewable curtailment reached 33% of evacuated power as of May 2026, with curtailment under temporary grid access highest during solar hours and remaining in the range of 50 to 60% during the same period . The U.S. clean energy sector, by contrast, continues to add capacity at record pace, with the Global X Lithium & Battery Tech ETF trading at $73.80, down -1.05% on Tuesday, according to market data. The Invesco Solar ETF closed at $54.81, while the iShares Global Clean Energy ETF traded at $19.33, reflecting broader market volatility. WTI crude settled at $71.50/bbl, up +0.63%, as geopolitical tensions continue to support oil prices.

What to Watch

India's transmission capex is projected to reach $60 billion to $72 billion between fiscal 2026-27 and 2031-32, ICRA estimated. Whether that investment arrives in time to prevent further curtailment will determine if the country's 500 GW non-fossil capacity target for 2030 remains achievable. In the U.S., watch for EIA's next monthly generator inventory report in August, which will show whether the 86 GW capacity addition forecast for 2026 is on track. And keep an eye on sodium-ion battery deployments—if residential uptake accelerates, it could signal a meaningful shift in home energy storage economics by year-end.