The battery gap: Europe only has 15mins of storage capacity

Europe has been pouring billions into building green energy generating capacity and half of all its electricity was generated by renewables last year. On one day in April, Spain generated all of its energy needs from renewables for the first time ever. It now has by far the lowest power costs on the Continent. Yet Europe has not solved the basic problem with renewables: when the sun goes down or the wind stops blowing solar panels and windmills stop working – the “baseload problem.”

A battery revolution is underway to fix that. As the price of batteries tumble and production ramps up, it is now possible to build vast arrays of grid-level batteries to store cheaply made solar power in the day and release it in the evening when demand spikes. New technologies like the sodium-ion batteries and the sand battery that are being developed now promise to drop prices even further.

The Holy Grail in this process is the eight-hour grid-level battery that can last all night, but no one is anywhere near that. A huge gap remains between the renewable generating capacity and the battery storage capacity from even the greenest of the green energy champions. In Europe the average storage is currently only enough to cover 15 minutes of demand during the peak period.

Only when battery storage becomes large enough to cover the entire period between sunset and sunrise will the green revolution be complete.

Europe still at the start

There is a number that captures the gap between Europe's clean energy ambitions and the physical reality of its power grid more starkly than any other.

The EU installed a record 27.1 gigawatt-hours of new battery storage capacity in 2025 — its twelfth consecutive record year. Total installed capacity reached 77.3 GWh. But that remains a fraction of average EU electricity demand that runs at roughly 300 GWh. Do the math. The answer emerges: the EU battery goes flat after only15 minutes.

The world is in the midst of a transformation that is simultaneously one of the most impressive industrial scale-ups in history and at the same time right at the start of the process before renewable energy can genuinely replace fossil fuels around the clock.

It all boils down to a simple question: how many hours of power can each major grid actually store in its batteries?

The answers range from seconds to weeks — depending entirely on how you define storage as batteries are not the only option.

Grid smoothers

It will take years to build up enough storage capacity to cover the whole night and to make it more complicated, that is a moving target as demand for power keeps growing. At this stage the increase in battery storage capacity is increasing at about 50-70% a year, whereas demand for power is rising at a far more modest 2-4% a year.

Batteries are growing exponentially, but from a very low base. The global battery fleet is about 600 GWh whereas global power demand is orders of magnitude larger at 3,000 GWh. So, like the EU, globally there is also only 15 minutes of stored power as well.

In advanced economies like the EU that growth is slower, and currently thanks to the deindustrialisation caused by the various wars and crises, demand is actually falling. However, in the rapidly emerging Global South economies, growth is much faster and the demand for power in these countries runs even faster than that. In India for example, demand growth for power easily out runs the roll out of new batteries. And even in advanced economies the additional batteries being added are still only adding minutes to the storage coverage not hours.

No country has reached storage at national scale. But the trajectory from where each grid sits today to that target reveals something important about which economies are making the right bets, and which are still building from a base so small that any headline growth figure, however impressive, is mostly a measure of how little existed before.

The EU’s 15 minutes and counting

The EU's battery story is genuinely impressive in historical terms. Battery storage capacity stood at just 7.8 GWh across the entire bloc in 2021. By end-2025 it had reached 77.3 GWh — a tenfold increase in four years.

Grid-scale systems accounted for 55% of new additions in 2025, with 15 GWh installed at grid scale — a clear structural shift toward the large, grid-connected projects that actually matter for power system stability. Germany led installations in the EU, followed by Italy, Bulgaria and Spain.

But the context is brutal. EU electricity demand averages around 300 GW continuously. Even the grid-scale portion of the battery fleet — roughly half of 77.3 GWh, or perhaps 40 GWh — covers around eight minutes of average demand. The full fleet, residential and commercial included, buys fifteen minutes. And that residential component is important; in Germany most of the battery storage capacity is residential batteries connected to roof top solar panels.

The EU needs to reach approximately 750-780 GWh by 2030 to support a fully flexible renewable system, according to consultants SolarPower Europe — the number of batteries has already increased ten-fold in the last four years, but it needs to increase by another ten-fold in the next four years – and that is going to be much harder.

"Europe's battery storage market is growing fast and delivering the flexible capacity our energy system urgently needs," said Walburga Hemetsberger, chief executive of SolarPower Europe. "But we must now dramatically accelerate deployment."

European champions

Germany is Europe's largest battery market by installed capacity. As of October 2025, Germany had 2.4 GW of grid-scale battery power and 3.2 GWh of grid-scale storage, with the German Federal Network Agency expecting total capacity to grow to approximately 41 GW by 2037 — almost twice the level projected just two years earlier.

Including residential systems, total battery storage approaches 24 GWh. Germany's average electricity demand is approximately 60 GW. Its total battery fleet therefore covers roughly 24 minutes of average demand. But the grid-scale alone covers only three minutes.

The average duration of grid-scale batteries in Germany is 1.4 hours — meaning individual projects can deliver peak shifting for over an hour, but the national fleet is far too small to cover evening demand consistently.

Predictably what is holding back the roll out of more batteries is not the lack of projects or cost, but Germany’s heavy bureaucracy. The pipeline of battery storage connection requests is extraordinary - over 500 GW have been submitted to German grid operators, but grid connection delays and bottlenecks are legion, slowing the expansion to a crawl.

Italy is Europe's second-largest battery market by utility-scale deployment, with ambitious targets. Italy has set a target of 58 GWh of grid-scale storage by 2030, with a capacity market that has proven effective at driving investment. Current installed capacity sits at approximately 8-10 GWh total. Against Italian average demand of around 35-40 GW, that represents roughly 15 minutes of coverage.

The UK is Europe's most mature battery market in terms of market design and project execution. The UK awarded 18 GWh through its capacity market auctions in 2025 and has set a Clean Power 2030 target of 23-27 GW of battery storage — one of the most ambitious national targets in the world.

Current installed capacity is approximately 6-8 GWh of grid-scale storage. UK average demand is around 35 GW, giving a coverage ratio of roughly 10-14 minutes. Individual projects and regional clusters are more advanced, with some areas of the UK grid seeing battery coverage approaching one hour — but at national scale, the gap remains vast.

France, despite being Europe's largest electricity exporter and having ambitions to export renewables at scale, has less than 1 GWh of new battery installations annually and remains significantly behind its peers. Spain has accelerated through EU recovery fund support and is approaching 5 GWh of total capacity, covering perhaps 5-7 minutes of its approximately 30 GW average demand.

A little is better than nothing

In the case of batteries, a little is a lot better than nothing. Batteries are not yet electricity supply, but even the limited capacity is transforming electricity pricing.

Without batteries what happens when the sun goes down is most countries have back up generating capacity that kicks in to meet evening demand – typically a gas-fired power plant. And as that fossil fuel is more expensive – especially since the Gulf war got underway in February – there is typically a price spike in the cost of power in the early evening. While 15 mins of stored power doesn’t seem like a lot, that extra “free” power has a disproportional effect on flattening the peak price spike.

The stand out example is Australia, which is well ahead of the rest of the world. Its battery network is already enough to provide almost an hour of coverage – one of the longest periods of any country. As IntelliNews reported, this power is enough to almost completely cover the initial peak demand period and has flattened out the price spike almost completely.

In Australia’s National Electricity Market, grid-scale batteries now amount to roughly 15–20 GWh of energy capacity, against an average system load of about 25 GW. That equates to 35–50 minutes of average demand. By charging during the midday solar glut — when wholesale prices frequently collapse towards zero or even become negative — and discharging into the early evening peak, batteries are slowly taking over from gas as the swing provider and setting marginal prices in key intervals and flattening the so-called “duck curve” spike after sunset.

This effect brings the goal posts significantly closer for governments grappling with high power costs. The UK and Germany already have some of the highest costs for power in Europe and way above those in the rest of Europe. But if they can triple or quadruple their batteries capacity, rather than increase it ten-fold, these countries can already significantly reduce the cost of electricity with only 60 minutes of coverage. The effect of batteries on power costs are already being felt, falling by 40% in 2024 and 31% in 2025 in India, which has embraced the transition to green energy.

Batteries not the only option

Most countries are reaching for batteries to store their renewable energy, but they are not the only option. Norway has little need for large-scale batteries because it already possesses one of the most powerful storage systems in the world – huge reservoirs of water. Around 90–95% of Norway’s electricity comes from hydropower, much of it stored in vast mountain reservoirs that function as natural batteries.

With installed hydro capacity of roughly 33–35 GW against average demand of only 12–15 GW, the system can ramp output up and down at will and store energy over days, weeks or even seasons, far beyond the few hours that lithium batteries can provide. In effect, Norway can already “store the day for the night” — and even “store the summer for the winter” — making additional battery deployment largely redundant except for niche grid services.

Globally, pumped hydro storage, as it is known, remains the dominant form of energy storage, accounting for about 90% of installed storage capacity worldwide. But it only works well in countries with suitable geography: large elevation differences, access to water, and space for reservoirs. This makes it ideal for mountainous or high-relief systems such as China (the world leader), the United States, Japan, Switzerland, Austria and the Nordic countries, as well as parts of Spain and Italy.

Nuclear power plays the same game changing role, providing system level emissionless power for entire countries, although it does come with a fuel dependency on uranium, with Russia one of the largest producers. In the interests of diversifying their power sources, many countries are opting to build nuclear power capacity in parallel with rolling out more renewables, with China’s policy of becoming the world’s leading electrostate being the leading example.

By contrast batteries, for now, are primarily short-duration tools for shifting power within the day for flat countries with lots of sun and wind.