German energy group RWE AG (<a href="https://www.boerse-frankfurt.de/equity/rwe-ag-adr-1" target="_blank">ETR:RWE</a>) will acquire a majority stake in a joint venture of US coal miner Peabody Energy Corporation (<a href="https://www.nasdaq.com/market-activity/stocks/btu" target="_blank">NYSE:BTU</a>) set up to develop 5.5 GW of solar and energy storage projects on reclaimed mining sites.