
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 Middle East and Africa Battery Energy Storage System (BESS) Market Report is Segmented by Battery Type (Lithium-Ion, Flow Batter, and More), Connection Type (On-Grid and Off-Grid), Component (Battery Pack and Racks, Energy Management Software, and More), Energy Capacity Range (10 To 100 MWh, 100 To 500 MWh, and More), End-User Application (Utility, and More), and Geography (Saudi Arabia, United Arab Emirates, Qatar, and More). [pdf]

Recently, multiple energy storage battery and material projects have announced updated progress: CATL's 80 GWh project has entered steel structure construction, Shenzhen Pengcheng Infinite New Energy Co., Ltd. launched the building of a 27 GWh energy storage cell base, 3d (Longyan) Battery Technology Co., Ltd.'s 1 GWh solid-state lithium battery project officially broke ground, and Tianmulake Excellent Anode Materials Co., Ltd.'s lithium battery material project was signed and finalized. [pdf]

Since March 2024, CR Power* (25 MW/100 MWh, Hami, wind+ESS, string architecture) and CGDG* (50 MW/100 MWh, Golmud, Qinghai, multi-energy) have completed groundbreaking performance tests of 100 MWh grid-forming energy storage plants with the guidance and support of local energy bureaus, SGCC*, and China Electric Power Research Institute. [pdf]
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