Voltstorage, a German company founded in Munich in 2016, is launching a vanadium-redox-flow (VRF) energy storage system aimed at the residential market.

While decreases in costs continue to make energy storage more and more competitive, financial advisory and asset management firm Lazard has highlighted just how variable project economics can be, citing examples of US projects with 9%, 11% and 21% IRR (internal rate of return).