SSE Salisbury_light(1920 x 690 px)
SSE + Wärtsilä

Reference case

A 50 MW / 100 MWh energy storage system helping the UK to decarbonise

Wärtsilä’s partnership with low carbon energy company SSE, one of the UK’s largest utilities, marks an important step in the UK’s path towards net zero. To help scale renewable energy capacity, Wärtsilä is delivering a 50 MW / 100 MWh energy storage system to SSE in Salisbury, Wiltshire. The system is the first to be directly connected to the transmission network by SSE and supports access to clean, reliable energy by balancing the intermittency of renewables.

The Salisbury energy storage system will provide grid services such as wholesale market trading, which will help balance renewable energy generation throughout the day. The facility will utilise Wärtsilä’s GridSolv Quantum, a fully integrated, modular, and compact energy storage system, as well as Wärtsilä’s sophisticated energy management software, the GEMS Digital Energy Platform.

What50 MW / 100 MWh Energy storage system
WhereUnited Kingdom
HowEPC (Engineering, procurement & construction)

This is what we are achieving

50 MW

and 100 MWh of energy storage capacity 

258 MW

in total - in the UK, utility-scale energy storage projects

Battery storage has a key role to play in helping the UK to decarbonise by ensuring we make the most of the increasing levels of renewable energy coming onto the grid. SSE is investing £24bn over this decade (circa £7m a day) in low carbon infrastructure of this kind and we are delighted to be working alongside Wärtsilä to provide the balancing and flexibility services we need to help the UK get to net zero

Richard Cave-Bigley, Director of Solar and Battery at SSE

How we did it

Challenge icon


  • Maintain frequency on the UK grid as fossil fuels come offline
  • Facilitate wholesale market trading to balance renewable energy generation
  • Assist sustainability goals 
Solution icon


  • Wärtsilä’s GridSolv Quantum energy storage system is the most innovative, safe, and cost-effective offering on the market today
  • Wärtsilä’s GEMS Digital Energy Platform allows SSE Utility Solutions Ltd to remotely monitor, operate, identify, and diagnose  equipment with unrivalled safety, reliability, and flexibility
Benefit icon


  • Add grid stability with instantaneous frequency regulation services
  • Enable more British energy consumers to access secure, low-cost renewable energy
  • Improve sustainability of SSE’s energy services and add more renewable energy on the grid

The main details

Customer SSE
Site size 50 MW / 100 MWh
Site locationSalisbury, Wiltshire
Scope EPC (Engineering, procurement & construction)
Delivery 2022
The UK

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