Project Spotlight


50 MW / 100 MWh
Improving grid reliability and sustainability

Unlocking the UK's path towards net-zero

Stabilising an increasingly renewable grid

To help scale renewable energy capacity, Wärtsilä delivered a 50 MW / 100 MWh energy storage system to SSE in Salisbury, Wiltshire. It supports access to clean, reliable energy by balancing the intermittency of renewables.

The Salisbury energy storage system provides grid services such as wholesale market trading, which helps balance renewable energy generation throughout the day.

The facility utilises Wärtsilä’s GridSolv Quantum, a fully integrated and modular energy storage system, as well as Wärtsilä’s GEMS Digital Energy Platform.

Main Data

Customer SSE
Site size 50 MW / 100 MWh
Site locations Salisbury, Wiltshire, UK
Applications Storage+
Scope of services Engineering, procurement and construction (EPC)
Delivery 2022
Aerial photo of empty meandering road in between forest.

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 £25bn 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.

Advancing the track record in the UK

Fostering collaborative customer relationships

Wärtsilä has a longstanding history supporting renewable energy integration and decarbonisation across the UK.

While this is the first partnership between Wärtsilä and SSE for a standalone energy storage system, the two companies have worked closely to scale up the UK’s power system flexibility over the past decade.

In 2021, Wärtsilä delivered an 8 MW / 6 MWh energy storage system to Scottish and Southern Electricity Networks Distribution, the distribution subsidiary of SSE plc, at the Lerwick Power Station on the Shetland Islands to provide grid balancing services and reserve power.


Wärtsilä's Solution


Maintain frequency on the UK grid as fossil fuels come offline

Wärtsilä's GridSolv Quantum energy storage system is the most innovative, safe, and cost-effective offering on the market today

Add grid stability with instantaneous frequency regulation services

Facilitate wholesale market trading to balance renewable energy generation

Wärtsilä's GEMS Digital Energy Platform allows SSE to remotely monitor, operate, identify, and diagnose equipment with unrivalled safety, reliability, and flexibility

Enable more British energy consumers to access secure, low-cost renewable energy

Assist sustainability goals

Improve sustainability of SSE's energy services and add more renewable energy on the grid