Eday Flow Battery Project
Project: Eday Flow Battery Installation
Funder: The Scottish Government via Highlands and Islands Enterprise
Funding: £1.8 million
EMEC will deploy an Invinity Energy Systems (AIM:IES) 1.8 MWh flow battery at the tidal energy test site on the island of Eday in 2021. This unique combination of tidal power and flow batteries will be used to power EMEC’s hydrogen production plant, demonstrating the world’s first continuous hydrogen production from variable renewable generation.
Invinity’s vanadium flow batteries (VFBs) are a form of heavy duty, stationary energy storage which are deployed in high-utilisation, industrial applications. They provide hours of continuous power, one or more times per day, through decades of service. This makes them the perfect candidate for regulating the generation of tidal energy, an application where more conventional lithium-ion batteries would degrade and eventually wear out.
Tidal generation is predictable yet variable, with two high and two low tides occurring each day. This is an extremely heavy cycling application, requiring up to four cycles per day, compared to solar coupled energy storage projects which typically require just one charge and discharge each day.
At EMEC’s site, the system will store electricity generated by tidal turbines during high power periods, and discharge it during low power periods. This will ‘smooth’ tidal generation to create continuous, on-demand electricity to turn into hydrogen using EMEC’s 670 kW hydrogen electrolyser. This will optimise hydrogen production at the site to enable tonnes of green hydrogen generation each year.
- Invinity Energy Systems (AIM:IES)
- November 2020: Flow Batteries to combine with Tidal Power to produce World’s First Continuous Green Hydrogen