UK Energy Storage: Battery Farm Boom Transforms Electricity Grid Balancing

Grid-scale battery energy storage has expanded rapidly in the United Kingdom over the past two years, with the total installed capacity growing significantly as developers commission projects across England, Scotland and Wales to provide the electricity system flexibility that becomes increasingly essential as variable renewables — wind and solar — comprise a growing proportion of generation. The storage systems can absorb surplus generation when output exceeds demand and discharge it when renewable output is low, reducing the need for gas-fired peaking plants and enabling higher proportions of clean generation to be accommodated on the grid.

The economics of battery storage have improved dramatically as lithium-ion battery cell prices have fallen following the scaling of electric vehicle manufacturing globally. Lower cell costs have reduced the capital expenditure required per megawatt-hour of storage capacity, improving the revenue per unit of capacity needed to justify the investment. The combination of falling costs and multiple revenue streams available in the electricity market — including capacity market payments, frequency response services and arbitrage between high and low price periods — has made storage projects commercially viable without subsidy for many developers.

National Grid Electricity System Operator has been an active supporter of storage development, identifying flexibility as one of the most valuable system services it needs to procure as the clean power transition progresses. The operator’s modelling suggests that very large amounts of storage will be needed to achieve the 2030 clean power target, creating a long-term pipeline of demand that gives investors confidence in committing capital to projects with operational lifetimes of 15-20 years.

Community benefit funds have been attached to many of the larger battery farm projects, recognising that storage facilities — while low-impact in terms of noise and traffic — do occupy land and represent a change in the visual character of rural areas where many sites are located.