Utility EWS and developer MW Storage expand Swiss BESS to 28MW

LinkedIn
Twitter
Reddit
Facebook
Email

Utility EWS AG and developer MW Storage have completed the expansion of a battery energy storage system (BESS) project in Switzerland from 20MW to 28MW, making it the country’s largest.

The companies inaugurated the newly expanded project last week in a ceremony last week (24 May), which adds 8MW to a 20MW/18MWh BESS that MW Storage originally commissioned in 2020.

The announcement didn’t reveal the MWh energy storage capacity of the expanded project. Prior to the expansion it was the joint-largest BESS in the country by megawatts along with a 20MW/20MWh system owned by independent power producer (IPP) Axpo.

EWS’ BESS project has primarily been deployed to help transmission system operator (TSO) Swissgrid keep the grid stable, via the provision of frequency response services to maintain a 50hz frequency.

This article requires Premium SubscriptionBasic (FREE) Subscription

Enjoy 12 months of exclusive analysis

Not ready to commit yet?
  • Regular insight and analysis of the industry’s biggest developments
  • In-depth interviews with the industry’s leading figures
  • Annual digital subscription to the PV Tech Power journal
  • Discounts on Solar Media’s portfolio of events, in-person and virtual

Or continue reading this article for free

It is being monetised in the Swiss electricity market by both CKW, part of Axpo, and utility Alpiq, the announcement said. The BESS is part of a network of power plants, consumers and batteries, it added.

The large-scale BESS market in Switzerland has been relatively quiet with renewable penetration on the country’s grid still relatively low. Axpo commissioned its BESS in February this year while utility Thurplus commissioned a 3MW system in September last year.

But Switzerland was the location for one of the largest energy storage projects commissioned in recent years, a 20GWh pumped hydro energy storage (PHES) unit which started operations in June 2022 in the Canton of Valais.

MW Storage is a developer of BESS projects which is also active in the German market, with a 100MW/200MWh project underway that it claimed is the country’s largest.

Read Next

Premium
October 2, 2025
Investor-owned utility (IOU) Southwestern Public Service Company (SPS) is seeking approval from the New Mexico Public Regulation Commission (NMPRC) to construct a new eight-project portfolio of self-build energy assets.
October 2, 2025
The TSO of Italy has completed its first MACSE auctions for energy storage, procuring 10GWh of capacity at what the NHOA CEO called ‘exceptionally competitive prices’.
September 29, 2025
Advances in sodium-ion battery energy storage systems come from Peak Energy in the US, deploying its sodium-ion system in Colorado, and Phenogy, deploying Europe’s largest sodium-ion system in Germany.
Premium
September 25, 2025
Northern California Power Agency (NCPA) has negotiated the terms of an energy storage services agreement (ESSA) with Aypa Power, relating to offtake from a 400MW standalone BESS destined for the County of San Bernardino. 
September 25, 2025
Although the government in Poland has taken steps to open up its energy storage market, regulatory challenges remain.

Most Popular

Email Newsletter