Wärtsilä to supply and maintain two major interconnected energy storage systems for Texas grid services 3/15/2021 Wärtsilä 70 MW energy storage system in California The technology group Wärtsilä will supply its advanced energy storage technology for two major projects in southern Texas, USA. The interconnected stand-alone systems will have a combined rated capacity of 200 MW. Wärtsilä has also signed ten-year guaranteed asset performance agreements for the installations. The order was placed by Able Grid Energy Solutions, Inc. (âAble Gridâ), a utility-scale energy storage project development arm of MAP RE/ES, one of North Americaâs leading investors in modern energy projects. The order was booked by Wärtsilä in February 2021.