Facts

The electricity grid has to stay in constant balance: at every second, the amount of power being generated has to match the amount being used. Traditionally, that meant ramping power plants up and down all day to chase demand as it rises and falls. Energy storage adds a new option. It works like a “warehouse” for electricity that the system can fill when power is abundant and cheap (e.g. when the sun shines and the wind blows) and release when demand outstrips supply (e.g. the evening). It smooths the mismatch between when power is made and when it is needed: a process called “energy shifting”.

That is why energy storage can sit almost anywhere useful in the system: e.g. next to generation such as a wind or solar farm (banking surplus output), on the grid itself, at substations (easing congestion), or at home or the office (storing cheap or self-generated power).

Want to know more? Go to the Applications section of this website to explore the full range of services energy storage provides across the electricity system.

Textbooks often say electricity (a form of energy) has to be used the instant it is generated. But energy storage tackles this issue by converting energy into another form that is easier to hold, keeping it, then converting it back when needed. Energy Storage Europe groups the technologies into five categories:

• Mechanical storage (e.g. pumped-hydro storage)
• Electrochemical storage (e.g. batteries)
• Thermal storage (e.g. heat storage)
• Chemical storage (e.g. hydrogen)
• Electrical storage (e.g. supercapacitors)

No single technology wins, because they have different applications: fast, short bursts at one end and long, even seasonal storage at the other. A reliable, clean energy system draws on a combination of storage technologies.

Want to know more? Go to the Technologies section of this website to read about the different energy storage solutions and their characteristics.

Recent electricity price spikes were driven mainly by Europe’s dependence on gas-fired generation, whose price is set on volatile international markets and is highly impacted by geopolitical events. Gas-fired generation alone can increase the whole bill because of how the wholesale market works: to meet demand, the grid switches on power plants cheapest-first, adding more expensive ones until supply meets demand. Every generator is then paid whatever that last, most expensive plant costs to run. That plant is frequently a gas plant, so when gas prices jump, the price of all the electricity in that hour jumps with it. Gas plants set the price in 55% of hours in 2022 while producing just 19% of the electricity, so gas-price shocks passed straight through to bills.

By increasing energy storage, demand-side response, and interconnector deployment, we could avoid around €9 billion a year in EU gas-purchase costs by 2030. This reduces our exposure to fossil-fuel price shocks and helps keep electricity bills more stable.

Want to know more? Read our position paper The Electricity Market Design Revision Proposal, on how reforming Europe’s electricity market and scaling up non-fossil flexibility like storage can shield consumers from gas-driven price spikes.

Yes. Spain, for example, shows it is already happening. Its high clean energy output (from a wide array of sources) has begun breaking the link between volatile gas prices and the electricity price: the share of hours in which fossil power sets Spain’s price fell from 52% in 2021 to just 9% in early 2026, leaving Spanish wholesale prices significantly below the EU average (by a third in 2025). This decoupling saved typical Spanish households €10 per month (approximately a 20% reduction) on their electricity bills during the March–April 2026 price spike. In contrast, in highly gas-dependent Italy, where gas influenced power prices in 75% of hours, electricity prices averaged more than three times higher than in Spain in March 2026.

The full savings only reach consumers when the system can actually use the cheaply produced energy. In this sense, the European Commission concluded that growing wind and solar translate into lower, steadier prices only if matched by enough energy storage, flexibility and cross-border interconnection to capture their output instead of wasting it.

Want to know more? Read our position paper The Electricity Market Design Revision Proposal, on the market reforms needed so a cleaner, less gas-dependent system delivers lower, steadier prices to consumers.

A gas peaker plant is a power station that switches on only for a few hours a day when demand peaks, which makes the electricity it produces expensive. Energy storage is increasingly a cheaper, faster way to cover those same peaks: several storage technologies can be built in months, provide a wider array of services, and their cost has fallen dramatically. An analysis from the IEA found that grid-scale battery storage paired with renewables is already cost-competitive with new gas- or coal-fired power plants. Conservative estimates assess that, by 2030, battery energy storage cost will be 20% lower than new gas peaker plants. Recent estimates assess 30–40% lower costs. At the same time, costs for gas plant construction have recently tripled in the United States.

Want to know more? Read our position paper Policy Options to Anticipate Europe’s Long-Duration Energy Storage Deployment, on market reforms needed so storage can compete fairly with gas peakers and other conventional peaking capacity.

Energy storage earns money in several ways at once. This ability to stack revenue streams is a large part of why installed capacity in Europe has grown past 100 GW.

The main revenue streams for energy storage are:

• Arbitrage: Buying electricity when it is cheap and abundant (e.g. a sunny, windy midday) and selling it when it is scarce and expensive (e.g. the evening peak). The bigger the price swing, the more it earns.
• System services: Being paid by the grid operator to help keep e.g. the system stable second by second. Energy storage can now access these services across most of Europe.
• Capacity markets: Payments for committing to be available at moments when the grid is under strain, through a scheme that system operators use to secure enough reliable capacity; the energy storage asset earns for standing ready, even if it is never called on. Energy storage now competes for such payments alongside conventional plants.
• Avoided costs: For a home or business, a battery cuts the electricity bill by storing cheap or self-generated solar power and shaving expensive peak-demand charges.

Want to know more? Go to the Applications section of this website to read about the different services energy storage provides.

Energy storage technologies are often mature; but outdated regulation and market rules hold energy storage back:

• Barriers to revenues: Market rules often de facto limit energy storage’s participation in different energy markets, or prevent it from combining different revenue streams.
• Outdated tariff structures: Network tariffs are often not cost-reflective of the impact of energy storage in the grids, which means high charges that kill the business case; double taxation is also a key hindrance.
• Project development bottlenecks: Slow permitting and grid connection processes, often not tailored to energy storage, lead to lower returns on investments and slower deployment.
• Business-as-usual mindset: In several EU countries, energy storage is not yet fully integrated into energy system planning and regulatory frameworks. As a result, some rules continue to reflect traditional energy system models that favour conventional flexibility options such as gas over newer solutions such as storage.

Want to know more? See our Grid Fees and Network Tariffs paper on ensuring the rules let energy storage’s benefits reach consumers.

Significantly: energy storage is the fastest-growing cleantech in Europe. Europe’s total energy storage capacity is expected to roughly double, from around 100 GW in 2025 to over 200 GW by 2030. The fastest growth is in grid-scale batteries, forecast to rise from 18.5 GW / 34.4 GWh in 2025 to about 125 GW / 368 GWh by 2030. This represents roughly a sevenfold increase in five years. Home and business batteries are set to keep growing strongly too. Germany, Great Britain, Italy, Poland, and Spain are expected to lead the build-out, with almost every European country adding meaningful capacity.

In terms of technologies, most new projects are battery energy storage systems. The historically dominant pumped-hydro storage still represents more than 50% of the installed storage capacity. In the years to come, long-duration energy storage (at the grid level) and thermal energy storage (at the industrial level) are expected to significantly rise in terms of deployment rates.

Want to know more? Go to the Figures section of this website to access the latest energy storage market intelligence.

Europe is one of the world’s fastest-growing energy storage markets, on track to roughly double its capacity, from around 100 GW in 2025 to over 200 GW by 2030. But other parts of the world are growing as fast or faster: California’s energy storage deployment is still higher than any individual European country, according to Energy Storage Europe analyses. And China leads both in battery storage and in pumped-hydro storage. This data is a reason for Europe to keep removing the barriers to energy storage deployment, so its fast-growing market can convert into lasting industrial and system-wide strength.

Want to know more? Go to the Figures section of this website to access the latest energy storage market intelligence.

Germany, Italy, and Great Britain are Europe’s three biggest energy storage markets, and together they hold the bulk of the continent’s installed capacity. Germany leads overall, driven by both large grid-scale projects and strong home batteries deployment. Great Britain and Italy follow closely, each combining major grid-scale build-out with strong home and business markets. A second tier of fast-growing markets, including Spain, Poland, the Netherlands and Bulgaria, is rapidly catching up, in many cases powered by new government support schemes. By 2030, Germany, Great Britain and Italy are still expected to lead, but the gap will narrow as these newer markets scale.

Want to know more? Go to the Figures section of this website to access the latest energy storage market intelligence.

When renewable generation is low, energy storage can release electricity that was stored when renewable generation was abundant. This can provide clean peaker capacity, historically provided by gas. For longer periods of low wind and solar generation, long-duration energy storage is emerging as a key part of the flexibility toolkit, alongside cross-border interconnectors and demand-side response. Together, these flexibility solutions can provide reliable backup through extended or seasonal periods of low renewable generation.

Want to know more? Go to the Applications section of this website and see our Policy Options to Anticipate Europe’s Long-Duration Energy Storage Deployment paper on how longer-duration storage covers extended low-wind, low-sun periods.

In some places it already does, for stretches at a time. For example, solar alone has briefly covered more than 80% of peak-hour electricity demand in nine European countries, exceeding 100% of demand in the Netherlands and Greece. But the real challenge is keeping the lights on during longer periods of low renewable generation.

Making this the norm rather than the exception rests on a few things working together. Looking at flexibility, energy storage covers the gaps, discharging when generation drops so that the system does not need to fall back on fossil generation. And interconnection and demand-response also add flexibility.

But all in all, grid operators are proving the system can take far more clean energy output than once assumed: Ireland’s operator currently limits non-synchronous supply (wind, solar and interconnector imports) to 75% of demand at any moment; but it targets up to 95% by 2030.

So yes: a European grid running on clean energy around the clock is achievable with energy storage, and it is already being built.

Want to know more? See our Policy Options to Anticipate Europe’s Long-Duration Energy Storage Deployment paper, and our Ensuring System Stability in Europe: The Role of Energy Storage in Providing Inertia paper.

Curtailment happens when grid operators deliberately turn down or switch off (renewable) generation that could otherwise be producing, because the system cannot use or move that power at that moment. There are two typical situations in which this happens: sometimes there is simply more renewable power available than demand at that hour, so some has to be switched off to keep supply and demand balanced. By 2030, this surplus could reach 183 TWh a year across the EU, roughly equal to Poland’s entire annual electricity use. At other times the power is needed, but the grid cannot carry it to where it is needed: a separate problem known as grid congestion. Either way, electricity ends up wasted.

While some curtailment is inevitable, huge amounts of energy being wasted is a real and growing risk: the European Commission estimates that, without action, 100 to 310 TWh of renewable generation could be curtailed due to grid congestion alone by 2040, with the cost of managing that congestion reaching as much as €100 billion a year. Rising curtailment is a signal: the system needs more flexibility. Such flexibility can be provided by energy storage which captures the renewables’ surplus instead of letting it go to waste, and releases it later when demand catches up.

Want to know more? Read our position paper Policy Options to Anticipate Europe’s Long-Duration Energy Storage Deployment, on how long-duration storage can cut the billions in costs that curtailment and grid congestion impose on Europe’s energy system.

Grid congestion is the electricity version of a traffic jam. A wind or solar farm can be producing plenty of clean power, but the power lines that carry it only have so much room, and when they are already full, that extra electricity has nowhere to go. Just like a motorway at rush hour, there are not enough lanes for all the traffic. The clean power is there; the grid connecting it to homes and businesses is the bottleneck, and the result is one of the two ways renewable energy gets curtailed. Relieving congestion means using tools like energy storage that take pressure off crowded lines, sited close to where the bottleneck actually is, alongside expanding and modernising the network itself.

Want to know more? See our Services to Support Transmission Infrastructure briefing on how storage relieves congestion on crowded lines, and our position paper on Grid Connections.

Yes, and its effects are already being felt. As renewables keep breaking records, Europe’s grids are struggling to keep pace. Gridlock combines three problems: lines fill up (congestion), clean power has to be switched off (curtailment) and new renewable projects face long queues just to connect. But good policy and strong energy storage deployment can ease these three problems.

Want to know more? See our position paper on Grid Connections and our reply to the European Commission’s consultation on the European Grids Package, on treating storage as a standard tool to relieve grid bottlenecks.

A grid booster can be a battery placed at a busy point on the network to “squeeze” more capacity out of power lines that already exist; so, more wind and solar can connect without waiting years for new ones. Operators normally keep some spare room on a line as a safety margin in case another line fails. A battery can stand in for that margin: charging to absorb power when the line is full, discharging the moment it is needed, and letting the existing line run much closer to its real limit. German grid operator TenneT is already deploying two 100 MW battery grid boosters to free up transmission capacity and minimise the need for costly new lines.

Want to know more? See our Services to Support Transmission Infrastructure briefing on how storage squeezes more capacity out of the existing network.

Beyond climate action, clean energy brings strategic benefits:

• Reduces import reliance: Home-grown energy reduces Europe’s dependence on imported fossil fuels, limiting exposure to geopolitical risks and supply disruptions;
• Strengthens resilience: Clean energy and reducing fossil-fuel dependence make the European energy system less vulnerable to future fossil-fuel price shocks;
• Improves affordability: Growing renewables and energy storage are already pushing down power prices where they operate at scale;
• Supports jobs and growth: Clean energy alone supported more than 1.8 million jobs in the EU in 2024, while the global sector reached 16.6 million jobs.

All in all, clean energy can make Europe less dependent on imported fuels, more resilient to fossil-fuel shocks, and better positioned to improve affordability and capture new economic opportunities.

Want to know more? See our Dual-Value Electrification: Affordable Energy & New Revenues for EU Industries paper, on how storage-backed electrification strengthens Europe’s independence, resilience and competitiveness.

Energy storage helps Europe use more clean energy and reduce the role of fossil fuels in the power system:

Firstly, it integrates more renewables: energy storage absorbs surplus wind and solar and releases it when demand is higher, allowing renewable electricity to be used when it is needed rather than only when it is generated. This makes it easier to integrate higher shares of renewables.

Secondly, it displaces polluting fossil generation: by shifting renewable electricity to periods of higher demand, energy storage can reduce the need for gas- and coal-fired generation. Batteries, pumped hydro and other storage technologies can provide flexibility over different timescales.

Besides, energy storage technologies themselves are subject to strict environmental and sustainability requirements. For example, EU battery rules promote responsible sourcing, lower carbon footprints, reuse and recycling, helping make energy storage more circular and sustainable over its lifetime.

In short, energy storage helps Europe use more clean electricity and reduce fossil-fuel generation. At the same time, sustainability rules help ensure that energy storage technologies themselves become more circular and environmentally responsible.

Want to know more? See our Energy Storage Targets 2030 and 2050 report, on the storage build-out Europe needs to integrate renewables and hit its climate targets.

No. Utility-scale batteries are growing fast, but small systems in homes and businesses are common in Europe: behind-the-meter batteries accounted for 56% of the storage capacity added in Europe between 2016 and 2025, and by 2025 around 4.5 million European homes had a battery installed. The appeal for a household is direct: a home battery stores the electricity that solar panels make by day so one can use it in the evening, cutting grid electricity fees and lowering the bills. Germany leads Europe by a wide margin, driven largely by these small and decentralised systems.

Want to know more? See our Business Case and Taxonomy of Behind-the-Meter Battery Energy Storage Systems in Europe briefing and our EMMES 10.0 market monitor on the fast-growing home and business storage market.

AI and data centres are pushing up electricity demand fast, and energy storage is one of the key tools that helps the grid handle that new demand while keeping data centres reliably powered. Data centres are emerging as some of the largest and fastest-growing new electricity loads. In Europe, the IEA expects data-centre electricity demand to grow by more than 45 TWh (a 70% increase) by 2030, a smaller but still fast-growing share of the global increase led by the United States and China. Data centres require reliable, often round-the-clock power, but AI workloads can also cause significant swings in demand. Connecting new data centres is becoming harder, too, as networks face capacity constraints and growing connection queues.

Energy storage can help address these challenges by making data-centre demand more flexible and easier to integrate into the power system. It provides four key services: flexibility, backup power, power quality, and speed-to-power. These help data centres manage their load profile and ease pressure on constrained grids.

Want to know more? Go to the Applications section of this website, and see our EMMES 10.0 market monitor on how storage firms up new, flexible demand like data centres.