Until recently, batteries on the European grid were a rounding error. That changed in 2024–2025. Large-scale batteries in Europe now total around 10 GW of installed power capacity - roughly three times the level of two years earlier - and credible sector forecasts put the number at 40 GW by 2030. The shift is no longer something the industry projects. It is something the transmission operators are already planning around.
What the numbers actually show
Ember’s European Electricity Review 2025 (covering 2024 data) records that wind and solar together produced 30% of EU electricity for the first time, narrowly edging past the 29.8% coming from the three main fossil fuels (coal, gas, oil). Coal fell to 9.2% of generation, the lowest on record. Gas briefly ticked up 8% year-on-year, mostly because 2024 was a dry year for hydro and demand rose, but the structural trajectory for fossil fuels is clearly down. Into that picture, large-scale batteries are growing rapidly: national pipelines are consistent with a 40 GW European total by 2030, up from around 10 GW at the start of 2025.
Rystad Energy’s 2026 Energy Storage report puts the same shift in global context. Cumulative global BESS capacity passed 250 GW in 2025, with 100 GW / 280 GWh added in that single year alone. Rystad’s forecast for 2026 is a further 130 GW / 350 GWh, with Europe and the US absorbing a material share. China remains the largest installer in absolute terms, but the European share has roughly doubled between 2023 and 2025.
Why 2024–2025 was the inflection point
Three things moved together. First, pack prices fell fast. BloombergNEF’s 2024 price survey put lithium-ion pack prices at around $115/kWh, down from $156/kWh in 2019 - the largest single-year drop since 2017. Chinese turnkey BESS systems reached $150/kWh in 2025 (Rystad), and NREL projects further pack-price declines through 2030. Second, grid-scale projects started clearing financeable thresholds at volume: ~15 tolling deals signed across Europe in 2025 versus 3 in 2024, and close to 24 GWh contracted under flexibility purchase agreements across the year. Third, regulatory frameworks converged: EU Regulation 2024/1747 on the Electricity Market Reform, the EU 15-minute trading go-live on 30 September 2025, and an Iberian capacity market framework published in mid-2025 all gave projects legible revenue signals they did not have before.
The emerging duty cycle
Europe’s new batteries are not doing what GB’s 2018–2020 fleet did. That first wave was overwhelmingly 1-hour, frequency-response-focused and ancillary-dominated. The 2024–2025 wave is mostly 2–4 hour and is increasingly cycled around wholesale arbitrage. Italy provides the cleanest illustration: Terna and Ember data show battery discharge typically equivalent to roughly 3% of peak gas-hour demand in 2025, up from near-zero two years earlier - a small share of dispatch but a meaningful share of peak flexibility. California’s CAISO shows what the mature phase looks like: in April 2025, batteries provided more than 20% of CAISO’s evening generation on a typical day. Europe is tracking toward the same destination on a 4–6 year lag.
What is still scarce
The binding constraint in 2026 is not battery supply. Pack prices continue to fall and the OEM queue is long. The binding constraints are grid connection and permitting. Across most European markets, new interconnection requests sit behind multi-year queues, and the fastest-growing category of connection approval is hybrid (solar-plus-storage or wind-plus-storage) inside an existing envelope. Germany, the Netherlands, Italy and Spain have all published regulatory or legislative changes specifically to accelerate storage behind existing connections, because that is the path with least friction in the next three years.
What to watch through 2026
Three numbers will tell whether the 40 GW trajectory holds. Italy’s MACSE auctions: Europe’s first large-scale, long-duration storage-specific capacity mechanism is clearing in 2025–2026 with contract terms up to 15 years. The Iberian first auction in 2026: price discovery for a 22.5 GW target. And the German Bundesnetzagentur’s inertia market, live from January 2026, which will be the first European revenue stream specifically engineered for grid-forming inverters. If any two of those three clear at volume, the Ember / Rystad trajectory for 2026–2030 is on track. If they clear badly, European battery deployment still grows - but the financing mix becomes more equity-heavy and the tail-end forecasts soften.