Oil supermajor Total’s energy storage unit Saft said it will build the largest lithium-ion battery system in the Nordics at a wind farm in Finland.

The 5.6MW/6.6MWh storage facility will be deployed at a 21MW wind project in the Finnish northwest developed by TuuliWatti, a statement said.

Saft said the Finnish deal is an early deal for its latest storage system, launched this year and targeting renewable, grid and on-site industrial deployments.

The news comes a day after Tesla announced it will boost by half the capacity of the world's largest battery storage system, also linked to a wind farm, to 150MW in Australia.

Total bought France-based Saft in 2016 as part of an energy transition strategy that has also seen it enter wind power, adding to its long-standing position in solar via US group SunPower.

Total is far from alone in seeing energy storage as a key plank of its future portfolio. Fellow oil giant Shell bought Germany’s Sonnen earlier this year.