The construction of Changsha battery energy storage power station has a great significance on solving the large peak-to-valley load and serious lack of power supply capacity of Changsha power grid. This paper uses the economic benefit index as the criterion

comprehensively considering the direct and indirect economic benefits of peaking and frequency regulation

delaying the upgrading and transformation of power grids and reducing line losses

to analyse the economic benefits of the grid side of Changsha battery energy storage power station. Considering the possible government financial subsidies in the future

the economic benefits have been further measured. The results show that in terms of the peak-valley price policy and battery technical conditions

the economic benefit of the grid side of Changsha battery energy storage power station is slight loss. If the policy subsidies are considered

the Changsha battery energy storage power station can produce a small operating profit.