ACC News Brief
Clean Energy Solar-growing regions worldwide
El Niño can turn solar variability into a grid-planning problem
What happened
Four decades of reanalysis found sustained solar-potential deficits during strong El Niño events in several fast-growing photovoltaic regions. Storage, transmission, demand response, and cleaner firm capacity can reduce the grid risk created when season-scale weather patterns affect several regions together.
Why it matters
Renewable planning must account for more than daily variability as solar's share of electricity grows. The study examined only three canonical super El Niños and used monthly ERA5 solar potential rather than measured plant output; its future emissions estimates depend on assumed photovoltaic growth and backup generation.
What to watch
- Validation against real plant generation and updates as the next El Niño develops.
- Regional storage, transmission, demand-response plans, and the emissions intensity of backup resources.
Sources & evidence
- Photovoltaic power response to El Niño–Southern OscillationPeer-reviewed Article, Communications Earth & Environment 7 (2026), published March 2, 2026. ERA5 reanalysis covers 1982–2024; future grid and emissions implications are modeled rather than observed.
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