IN Brief:
- GlobalData forecasts cumulative BESS capacity rising from 224.8GW in 2025 to around 1,300GW in 2030.
- The outlook implies compound annual growth of approximately 42%.
- Britain has reached 7.5GW of grid-scale battery power but retains substantially more projects than projected system need.
GlobalData expects worldwide battery energy storage system capacity to rise from 224.8GW at the end of 2025 to approximately 1,300GW by 2030.
The forecast represents almost sixfold growth over five years and a compound annual increase of approximately 42%. China and the United States are expected to remain the largest markets, while Europe, the Middle East, Latin America, and the wider Asia-Pacific region continue to expand utility-scale pipelines.
Expressed in gigawatts, the forecast describes power capacity rather than the quantity of energy stored. That distinction is becoming more important as projects move from short-duration frequency applications towards batteries designed to discharge for two, four, or more hours.
A 1GW fleet of one-hour batteries provides a different system resource from 1GW of four-hour systems, despite sharing the same power rating. The longer-duration fleet can deliver four times the energy before recharging, changing its ability to cover extended demand peaks, renewable shortfalls, or network outages.
Britain’s grid-scale battery power capacity reached approximately 7.5GW by the end of 2025 after a record 2.3GW was energised during the year. The Clean Power 2030 plan identifies a requirement for between 23GW and 27GW of grid-scale batteries by the end of the decade.
Projects already within the development and connection pipeline exceed the upper end of that range. Connection reform is intended to prioritise schemes aligned with system requirements and capable of meeting delivery milestones rather than preserving speculative positions indefinitely.
Deployment volume shifts attention towards system value
Falling equipment costs and standardised containerised products have accelerated construction, although installed megawatts do not provide a complete measure of network contribution. Location, duration, efficiency, availability, control performance, degradation, and connection conditions determine which services an individual project can supply.
Early battery fleets concentrated heavily on fast frequency response, but growing competition reduced revenues in several of those markets. Newer projects increasingly combine wholesale arbitrage, balancing actions, reserve, capacity-market income, and network services rather than relying on one dominant contract.
Proposals for an EU storage target of 200GW by 2030 place regional ambitions within a much larger global build-out. Accelerating demand will increase competition for battery cells, power-conversion systems, transformers, switchgear, and experienced system integrators.
Grid-forming capability is also becoming more prominent as synchronous generation operates less frequently. Suitably designed batteries can support voltage, frequency, inertia-like response, fault behaviour, and system restoration, but those services require appropriate inverter hardware, control algorithms, protection coordination, and compliance testing.
Fire safety and emergency planning remain central to deployment. Cell chemistry, propagation barriers, ventilation, detection, suppression, separation distances, access, water management, and coordination with emergency services must be considered throughout design, construction, and operation.
Battery capacity and efficiency decline through calendar ageing and cycling, with the rate influenced by temperature, state-of-charge range, depth of discharge, power demand, and operating strategy. Revenue optimisation must account for degradation rather than treating every dispatch as having no future cost.
Supply chains are evolving as lithium iron phosphate becomes common in stationary storage and sodium-ion systems enter early commercial deployment. Equipment selection must balance safety, energy density, footprint, cost, warranty terms, efficiency, and long-term component availability.
In mature markets, connection availability may become a greater limitation than battery supply. Britain already has more proposed capacity than projected national requirements at several future dates, placing greater emphasis on whether projects are located where they can relieve constraints or provide required services.
A battery behind a congested transmission boundary may absorb renewable output that would otherwise be curtailed, whereas one connected in a saturated area could add little value or increase competing import demand. Planning will therefore need to move beyond national capacity totals towards locational and temporal system requirements.
A global fleet approaching 1,300GW would establish batteries as a routine element of electricity infrastructure rather than a specialist balancing technology. Reaching that scale will require continued development of connection rules, safety standards, recycling, market access, and operating practices alongside manufacturing growth.
