Batteries are moving from technology component to energy-system infrastructure. In Batteries and Secure Energy Transitions, the IEA says battery storage was the fastest-growing commercially available energy technology in the power sector in 2023, with 42 GW added globally — more than double the previous year.
The reason is structural. As more solar and wind enter power systems, storing electricity during periods of abundant generation and releasing it later becomes more valuable. Batteries do not replace grids or other forms of flexibility, but they make the system more adaptable.
From 42 GW of annual additions to a different scale
In the IEA Net Zero Emissions scenario, total energy storage reaches around 1,500 GW by 2030 to support the tripling of renewables while maintaining electricity security. Batteries deliver roughly 90% of that growth, reaching 1,200 GW.
That would require battery-storage deployment to continue increasing by around 25% per year on average through 2030. Batteries have one advantage over many large energy assets: projects can often be built within months and in many different locations.
Costs keep falling
The IEA projects a further 40% decline in average global lithium-ion battery costs between 2023 and 2030. Sodium-ion chemistries may provide alternatives in applications where energy density and weight matter less.
This broadens use cases across utility-scale storage, behind-the-meter batteries, microgrids, home systems and electric vehicles. One industrial ecosystem is therefore serving several rapidly growing markets.
Supply-chain concentration
The boom also creates an industrial-security issue. China has almost 85% of global battery-cell production capacity and a very large share of processing for materials such as lithium and cobalt.
Europe, the United States and Korea are trying to expand domestic manufacturing. Diversification is difficult because competitiveness depends on scale, material access, skills and energy costs.
Not only electric cars
Batteries are often associated with vehicles, but in power systems they perform specific functions: shaving peaks, absorbing surplus generation, providing grid services and easing local congestion.
Their value rises as variable generation increases. A battery does not generate electricity, but it can make existing electricity more useful by shifting it through time.
One technology, many dependencies
The future of storage therefore depends on two parallel trends: continued improvement in cost and performance, and more resilient supply chains. The global battery market is set to expand rapidly, making it one of the central industrial battlegrounds of the energy transition.
The choice is not batteries versus grids. Both are needed. Storage is one of the technologies that lets a high-renewables power system operate with greater flexibility and security.
