U.S. grid build‑out in 2025 is unambiguous: solar and batteries are doing the heavy lifting. The Energy Information Administration expects 63 GW of new utility‑scale capacity this year, with solar and storage providing 81% of the total—an acceleration from 2024’s record pace. (U.S. Energy Information Administration)
That outlook is tracking to reality. Developers installed 12 GW of utility‑scale solar in 1H 2025 and reported plans for another 21 GW in 2H, a cadence that would set a new annual high for large‑scale PV. On the storage side, the market posted a record 5.6 GW in Q2, underscoring batteries’ central role in absorbing midday solar and firming evening supply. (U.S. Energy Information Administration)
Nowhere is the structural shift clearer than California. The state reports ~17 GW of grid‑scale batteries online as of mid‑November, roughly one‑third of what regulators estimate is needed by 2045. Early‑year dispatch patterns show the fleet is already trimming curtailment as a share of solar generation: for Jan–May 2025, CAISO data indicate the curtailment share fell ~12% year over year even as total solar output grew. The absolute MWh curtailed still vary by month, but the trajectory is the point—storage is chipping away at the midday oversupply problem. (California Energy Commission)
Execution risk hasn’t vanished, but it’s improving at the margin. EIA’s latest tally shows fewer solar projects reporting delays—about 20% of planned capacity in Q3 2025, down from 25% a year earlier—suggesting supply chains and interconnection scheduling are stabilizing from 2023–2024 turbulence. That matters for sponsors racing the clock on tax‑credit windows and offtake milestones. (U.S. Energy Information Administration)
What this means: The center of gravity in U.S. capacity growth is now solar‑plus‑storage, with batteries proving their worth in real‑time operations, not just pro formas. Curtailment will persist in shoulder months and congested pockets, but the direction of travel is constructive: more flexible capacity, better capture of PV output, and a clearer runway for utility‑scale additions through 2026. Sponsors should keep leaning into storage‑paired designs and interconnection nodes where batteries shift rather than spill midday megawatt‑hours.
Sources
- EIA — Today in Energy: “Solar, battery storage to lead new U.S. generating capacity additions in 2025” (expects 63 GW, 81% solar+storage). (U.S. Energy Information Administration)
- EIA — Today in Energy: “Developers added 12 GW of utility‑scale solar in 1H 2025; plan 21 GW more in 2H.” (U.S. Energy Information Administration)
- ACP/Wood Mackenzie — U.S. Energy Storage Monitor: Q2 2025 set a 5.6 GW quarterly record. (Wood Mackenzie)
- California Energy Commission / Governor’s Office: California reaches ~17 GW of grid‑scale battery storage (Nov. 2025). (California Energy Commission)
- pv magazine USA: Curtailment share down ~12% in Jan–May 2025 vs. prior year, per CAISO data. (pv magazine International)
- EIA — Today in Energy: “Fewer U.S. solar projects are reporting delays in their timelines” (delay rate ~20% in Q3 2025 vs. 25% in Q3 2024). (U.S. Energy Information Administration)
