Scotland (1920 x 690 px)
Lerwick SSEN + Wärtsilä

Reference case

Energy storage solution to balance the grid for the Scottish Shetland Islands

A reliable electricity supply is essential to the local community living on the Shetland Islands, a subarctic archipelago in the Northern Isles of Scotland. The Lerwick Power Station is the main generator for the grid, with an obligation to deliver uninterrupted power to the island community.

The introduction of energy storage will enhance the islands’ security of supply and reduce operating hours on the diesel generators. Wärtsilä’s 8 MW / 6 MWh energy storage system and GEMS Digital Energy Platform are enabling an increased integration of existing renewable power into the power system, which will help lower CO2 emissions. A combination of flexibility solutions is setting the Scottish archipelago on a path towards a cleaner energy system.

What8 MW / 6 MWh energy storage system
WhereShetland Islands, Scotland
HowEPC (Engineering, procurement & construction)

This is what we are achieving

8 MW

and 6 MWh of energy storage capacity


tonnes of fuel savings 


tonnes of CO2 reductions

The Wärtsilä energy storage system will enhance the islands' security of supply, while at the same time lowering our carbon footprint.

Darren Hitchin Embedded Generation Manager, Lerwick Power Station

How we did it

Challenge icon


  • Ensure a balanced grid for the secure supply of (reserve) power.
  • Upgrade existing infrastructure.
  • Integrate renewables to support a reliable islanded grid.

Solution icon


  • Reduce the operating hours on current diesel generators and displace spinning power generation.
  • Modernise the grid by providing extra energy supply via the storage solution that can instantly deliver power if there are power supply interruptions.
  • Integrate and optimise penetration of wind turbine-generated electricity into the grid with the GEMS Digital Energy Platform.

Benefit icon


  • Enhanced security of power supply.
  • Improved utilisation of existing wind power into the system.
  • Further energy infrastructure stability, and reduced CO2 emissions and fuel costs.

The main details

Customer Scottish and Southern Electricity Networks Distribution (SSEN)
Site size 8 MW / 6 MWh
Site locations Shetland Islands, UK
Applications Island Grid+, Grid reliability, Renewables integration
Scope Engineering, procurement and construction (EPC)
Delivery 2021
Lifecycle solution 10-year service agreement
Shetland Islands, Scotland

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