
A detailed financial analysis reveals that investment costs can soar above $100 million, depending on the specifications and intended use of the facility.Investment breakdown may include equipment purchase, installation costs, operational expenses, and potential incentives.For instance, lithium-ion battery systems tend to be more expensive upfront but offer higher energy density and efficiency, while other alternative storage technologies may require a different financial evaluation. [pdf]

According to the data of the National Energy Administration, from the perspective of investment scale, since the "14th Five-Year Plan", the new new energy storage capacity has directly promoted economic investment of more than 100 billion yuan, driven the further expansion of the upstream and downstream of the industrial chain, and become a "new driving force" for China's economic development. [pdf]

For example, the average revenue of an Electric Reliability Council of Texas (ERCOT) battery in 2023 was $182 per kilowatt per year, but the best-performing asset in the same region was closer to $300 per kilowatt per year, a 60 percent increase. 4 Similar dynamics—where there is a large spread between the best and worst performers—are observed in other grid-scale battery markets, such as the United Kingdom. 5 A variety of factors, including design choices such as battery duration and commercial strategy, can affect these outcomes. [pdf]
The efficiency of this pumped storage power station will be "90% ". Thus the above answer is appropriate.
While energy storage is already being deployed to support grids across major power markets, new McKinsey analysis suggests investors often underestimate the value of energy storage in their business cases.
Evaluating potential revenue streams from flexible assets, such as energy storage systems, is not simple. Investors need to consider the various value pools available to a storage asset, including wholesale, grid services, and capacity markets, as well as the inherent volatility of the prices of each (see sidebar, “Glossary”).
The revenue potential of energy storage is often undervalued. Investors could adjust their evaluation approach to get a true estimate—improving profitability and supporting sustainability goals.
Ancillary services that stabilize the power grid typically represent 50 to 80 percent of the full storage revenue stack of energy storage assets deployed today. This is observed across multiple mature storage markets but is expected to decrease to less than 40 percent by 2030.
The use of stochastic models, coupled with innovative commercial strategies, could help operators better assess the potential of these assets—enhancing business cases and supporting the continued acceleration of the energy transition.

The project will provide four medium speed, four stroke, heavy fuel oil (HFO) driven generators with a capacity of 15 MW each; a power station building; two 1000 cubic metre tanks for the storage of HFO; and one 132 Kv substation for connection of the power plant to the existing electricity grid belonging to the Central Electricity Board (CEB), the State owned electricity utility in Mauritius. [pdf]
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