One evening in March 2026, batteries stored on California’s grid covered 40% of the state’s electrical load. This is not an experiment. This is not an isolated record. Over the entire first quarter, batteries ensured a significant share of hourly ramp-up capacity in California — that is, the ability to increase power when demand surges or the sun disappears. The argument that has structured energy policy debate for twenty years — renewables don’t work when the wind doesn’t blow and the sun doesn’t shine — has just been rendered factually obsolete, not by a promise, but by operational data from a large-scale grid. California has changed regimes. The problem is no longer technical: it is geopolitical and industrial.
The Essentials
- In Q1 2026, batteries ensured a significant share of hourly ramp-up capacity on California’s grid and covered 40% of the state’s load one evening in March (CAISO data).
- China accounts for approximately 60% of global storage capacity additions in 2025 according to the IEA, and controls 90% of LFP cell manufacturing, the chemistry that dominates the market.
- Europe has multiplied its installed capacity tenfold in four years, reaching 77.3 GWh by end of 2025, but its annual additions remain approximately six to seven times lower than China’s.
- The 2023 Battery Regulation and the Net-Zero Industry Act set the right targets, but the recycled content thresholds planned for 2031 assume a European cathode supply chain that does not yet exist.
What California Built Since 2020
To understand what the March 2026 evening represents, we must go back to 2020. That summer, California experienced two consecutive days of rolling blackouts following an extreme heat wave. The grid could not hold. Governor Gavin Newsom launched an emergency plan to deploy additional storage capacity within weeks. The promise seemed excessive. It was fulfilled.
This first shock triggered a public-private investment dynamic that the figures make legible. California exceeded 10 GWh of installed capacity in 2023. It exceeds 15 in 2025. And most importantly, the form of use has changed: batteries no longer serve to eliminate spikes of a few minutes — they manage ramps lasting several hours, structurally replacing peak gas in daily cycles. It is this functional shift, documented by the operational data of the California Independent System Operator (CAISO), that makes these Q1 2026 figures something more than a record: it is a modification of the grid’s mode of operation.
The economic logic followed. The cost of lithium-ion batteries fell 90% between 2010 and 2023 according to the IEA, and large projects in the United States now sign contracts below $100 per MWh stored in certain configurations — a level that makes them competitive with open-cycle gas turbines, used precisely for ramp-up. The California demonstration is not a subsidized laboratory case; it is the result of a combination of deliberate public policy, capacity markets that value storage, and structural cost reductions.
What California Data Implies for Europe
The intermittency argument has long served to defer investments in solar and wind. The reasoning was simple: an energy source that does not produce continuously requires double investment — in the source and in the backup. This additional cost made the economic balance unfavorable and justified maintaining gas, even coal, as the foundation of the system.
This reasoning is not wrong. It is now outdated.
When batteries cover a significant share of ramp-up capacity on a California grid — which supplies 40 million people in a state whose GDP exceeds that of France — the additional cost in question is no longer theoretical: it is measurable, and it is becoming lower than the cost of fossil fuel alternatives. The IEA, in its early 2026 commentary on the rise of storage, notes that stationary batteries now represent the fastest-growing source of investment in flexible capacity in the world, ahead of gas turbines.
For Europe, which aims for 45% renewables in its electricity mix by 2030 under REPowerEU, this is both good and bad news. Good, because the technical solution exists and works at large scale. Bad, because Europe doesn’t manufacture it.
China Manufactures What Europe Installs
The industrial geography of battery storage is simple and uncomfortable. China controls 90% of global LFP (lithium iron phosphate) cell production, the chemistry that has become dominant in stationary storage due to its thermal stability, long lifespan, and declining cost. CATL and BYD alone represent a dominant share of global cell production capacity. According to the IEA, China accounted for approximately 66% of global installed storage capacity additions in 2024; this figure reaches ~60% for additions in 2025.
Europe has made real progress. The 77.3 GWh of installed capacity by end of 2025 represents a tenfold increase in four years, driven by Germany, the United Kingdom, Italy, and Spain. This deployment is real. But Chinese additions in 2025 (~167 GWh) are approximately six to seven times higher than European additions (~27 GWh) over the same period. And the cost differential is structural: a large battery costs between 30 and 45% more in Europe than an equivalent battery in China according to IEA and BloombergNEF analyses, a gap that reflects both the economies of scale enjoyed by Chinese manufacturers and the absence of a cathode material supply chain on European territory.
This recalls the dynamic described around critical raw materials: resources and technology exist, but the distribution of gains across the industrial chain remains highly unequal. The energy transition structurally depends on value chains that Europe does not control, and storage is a striking illustration.
What the 2023 Battery Regulation Can and Cannot Do Alone
The European Union is not without answers. The 2023 Battery Regulation, entering progressively into force, is one of the most ambitious regulatory texts ever adopted on an industrial product. It imposes requirements for material traceability, a digital passport for each battery, and minimum thresholds for recycled content: 16% recycled cobalt, 85% lithium recovered at end-of-life by 2031, with progressive interim targets. The Net-Zero Industry Act, adopted in 2024, for its part sets an objective of 40% of clean technology demand being covered by European production by 2030.
These texts make the right diagnosis. Europe cannot depend on imports for infrastructure this central to its transition. And regulation via recycled content is an intelligent way to create demand for European materials without explicit protectionism. But they have a limit: the 2031 thresholds assume a European cathode supply chain is operational by then. It does not exist today at the required scale.
Lithium deposits exist in Europe — in Spain, Portugal, the Czech Republic, Finland. Refining and cathode precursor production projects are underway at Umicore, Northvolt before its 2024 financial difficulties, and a few newer players. But the complete chain — from extraction to processed lithium salts, to precursors, to active cathodes, to cells — is not assembled. And Northvolt, the player that was supposed to be its pivot, experienced a painful 2024 restructuring that underscored the difficulty of building heavy industry from scratch in a context of high European costs.
The Battery Regulation thus creates regulatory demand. Industrial supply remains to be built.
Ongoing Bets and the Actors Making Them
Several dynamics merit being named rather than drowned in pessimism about European delays.
The European Commission has equipped the European Battery Alliance, launched in 2017, with IPCEI (Important Projects of Common European Interest) funding that enables coordinated state aid between member countries — an exceptional mechanism in European state aid law. The IPCEI Batteries II project, launched in 2023, mobilizes public and private investments across a dozen member states, along the entire value chain: active materials, cells, systems.
On the production site front, ACC (Automotive Cells Company, a joint venture of Stellantis, TotalEnergies, and Mercedes) is building gigafactories in France and Germany, targeting 120 GWh capacity by 2030. Verkor, a French project supported by EDF and Renault, aims for its first factory in Dunkirk to be operational in 2025-2026. FREYR, a Norwegian company, is developing a site in Norway. These projects are underway, not merely promised.
On the usage side, several European grid operators are making progress integrating batteries into capacity markets. RTE in France has launched specific calls for tenders for short-duration storage. The United Kingdom, whose grid has distinguished itself as one of Europe’s most advanced in terms of flexibility, has seen its batteries contribute significantly to grid frequency management since 2023. Germany is advancing on long-term contracts for industrial storage under its Energiespeichergesetz.
These bets do not guarantee catching up with China. But they indicate that something concrete is happening, not just regulatory paperwork.
The Open Question: Who Sets the Price of Storage in 2030?
The real question raised by California data is not “Do batteries work?” It is: “Who will manufacture the batteries that will power European grids in ten years, and at what price?”
The answer to this question will have significant economic consequences. If 80% of batteries installed in Europe in 2030 are Chinese — as solar panels are 95% today — Europe will have solved its intermittency problem but created a new industrial dependency at precisely the moment when geopolitical tensions make such dependencies strategically vulnerable. If, conversely, the gigafactories under construction reach their 2030 targets, the cost of European batteries could converge with Asian prices through economies of scale — reducing the current cost gap without requiring outright protectionism.
California provided technical proof. It did not provide the industrial model. The state of Los Angeles deployed batteries, a significant portion of which are manufactured in China, in a context of an American market beginning to close via tariffs and the IRA. Europe, meanwhile, wants both to deploy quickly and to produce domestically — two objectives that create real tension in timelines. Deploying Chinese batteries now accelerates the transition; building European batteries now prepares sovereignty. The two are not incompatible, but they require distinct policies with different time horizons.
What Q1 2026 data settled is the technical question. The debate that remains open is that of sharing gains from a transition whose key components are still manufactured too far from Europe for Europe to be safe.
Sources
- IEA — Battery storage is scaling up and taking on a larger system role: https://www.iea.org/commentaries/battery-storage-is-scaling-up-and-taking-on-a-larger-system-role
- SolarPower Europe — EU Market Outlook for Battery Storage 2025-2029 (no link — report available on SolarPower Europe website)
- California Independent System Operator (CAISO) — grid operational data Q1 2026 (no link — CAISO dashboard opower.caiso.com)
- Regulation (EU) 2023/1542 of the European Parliament and of the Council on batteries — Official Journal of the European Union
- Net-Zero Industry Act — European Commission (no direct link — consolidated text available on EUR-Lex)
- IEA — World Energy Investment 2024: https://www.iea.org/reports/world-energy-investment-2024
- IEA – Batteries and Secure Energy Transitions (2024): https://www.iea.org/reports/batteries-and-secure-energy-transitions/executive-summary
- IEA – Global Energy Review 2026: https://www.iea.org/reports/global-energy-review-2026/technology-battery-storage
- SolarPower Europe – EU Battery Storage Market Review 2025: https://www.solarpowereurope.org/press-releases/new-report-eu-installs-27-1-g-wh-of-new-batteries-in-2025-as-utility-scale-storage-drives-record-growth
- CAISO – Special Report on Battery Storage 2024: https://www.caiso.com/documents/2024-special-report-on-battery-storage-may-29-2025.pdf
- IEA – Global EV Outlook 2024 (LFP production): https://www.iea.org/reports/global-ev-outlook-2024/trends-in-electric-vehicle-batteries
- EU Battery Regulation 2023/1542 – 2031 recycled thresholds: https://www.batterydesign.net/legislation-rules-and-regulations/eu-battery-regulation/
- BloombergNEF LCOE Report 2026 – battery vs gas competitiveness: https://about.bnef.com/insights/clean-energy/battery-storage-costs-hit-record-lows-as-costs-of-other-clean-power-technologies-increased-bloombergnef/
- CPUC – August 2020 Heat Wave: https://www.cpuc.ca.gov/industries-and-topics/electrical-energy/summer-2021-reliability/august-2020-heat-wave