Battery Storage
Reviewed by Maria Coronado Robles, Sustainability Content Principal at xUnlocked · Last updated July 2026 Battery storage is the use of large-scale batteries to store electricity when it's generated and release it later, when it's needed. It's become one of the fastest-growing technologies in the energy system because it solves the central problem of variable renewables — solar only generates by day and wind only when it blows — by holding surplus power for use during gaps in generation or peaks in demand. Growth has been rapid: 108 GW of new battery storage capacity was installed worldwide in 2025 alone, 40% more than the year before, and total installed capacity is now eleven times higher than it was in 2021, according to the IEA.
What are the key drivers of battery storage growth?
Falling costs. Battery pack prices for stationary storage dropped to $70 per kilowatt-hour in 2025 — 45% lower than in 2024 and the sharpest price drop of any battery segment, making grid storage the cheapest use case for batteries for the first time, per BloombergNEF. Cheaper batteries make storage viable at a scale that simply wasn't economical a few years ago.
Lithium iron phosphate (LFP) adoption. LFP batteries — cheaper and better suited to frequent daily cycling than the nickel-based chemistries common in electric vehicles — now account for around 90% of new storage deployments, up from well under half just five years ago.
Renewables integration. As solar and wind supply a growing share of electricity generation, grid operators need flexible capacity to balance variable output — storage increasingly plays that role alongside, and in some cases instead of, gas peaker plants.
Manufacturing scale in China. China accounted for around 60% of global battery storage additions in 2025, reflecting its dominant position in cell manufacturing and the resulting cost advantages that flow through to project economics worldwide.
What are the main types of battery storage?
Utility-scale storage. Large battery installations connected directly to the grid, typically co-located with or near renewable generation or substations — this made up around four-fifths of new capacity in 2025.
Behind-the-meter storage. Smaller systems installed by commercial and residential consumers, often paired with rooftop solar, used to shift self-consumption or provide backup power.
Duration. Most projects still store around two hours of output, but an increasing share are being built for four hours or more as the value of longer-duration flexibility grows in grids with rising shares of solar.
What are the challenges facing battery storage?
Duration limits. Most deployed storage today covers hours, not days — it's well suited to daily solar/demand mismatches but doesn't yet solve longer seasonal or multi-day gaps in renewable output, which still require complementary solutions.
Critical mineral supply chains. Like other clean energy technologies, batteries depend on lithium, cobalt and nickel, whose extraction and processing are geographically concentrated and carry their own environmental and social risks.
Grid integration and market design. In many markets, electricity market rules and grid codes were built around conventional generation and haven't fully caught up with how storage actually operates, which can slow deployment even where the economics are favourable.
For a broader look at how battery storage fits alongside the other technologies driving the shift to clean energy, see Why Clean Energy is Inevitable I, a video module presented by Richard Black, Renewable Energy Expert and Director of Policy and Strategy at Ember.
Frequently asked questions
How does battery storage help renewable energy?
Solar and wind generate electricity only when the sun shines or the wind blows, which doesn't always match when demand is highest. Battery storage closes that gap by storing surplus renewable generation and releasing it later, reducing reliance on fossil-fuel backup plants and helping grids absorb a higher share of variable renewable generation without compromising reliability.
What is LFP and why does it matter for battery storage?
LFP (lithium iron phosphate) is a battery chemistry that's less energy-dense than the nickel-based chemistries commonly used in electric vehicles, but cheaper and more durable under frequent charge-discharge cycling — exactly the pattern grid storage batteries experience. That combination has made it the dominant chemistry for stationary storage, accounting for around 90% of new deployments in 2025.
Is battery storage the same as a battery electric vehicle battery?
They use overlapping chemistries but are optimised differently. EV batteries are designed to maximise energy density and range within a constrained size and weight, since they need to move with the vehicle. Stationary storage batteries face no such constraint, so cost and cycle life tend to matter more than energy density — which is part of why cheaper, less energy-dense LFP chemistry has become the default choice for storage specifically.
