The firm has been one of the key players in the German grid-scale BESS market in the past few years. As a huge power firm present across technologies and regions, it likely has a significant degree of in-house system integration capabilities. IPP Kallista enlists Envision Energy for France BESSClean energy technology firm Envision Energy will supply BESS to independent power producer (IPP) Kallista for its Neuilly-en-Thelle 193MW/386MWh project in Hauts-de-France, France. Power firm EDF’s Agregio Solutions will optimise its dispatch in the electricity market. The largest BESS project currently online in France is a 240MW/480MWh one from TagEnergy, supplied by Tesla.