US renewable natural gas (RNG) producer Archaea Energy, a BP plc (<a href="https://www.londonstockexchange.com/stock/BP./bp-plc/company-page" target="_blank">LON:BP</a>) company, and GFL Environmental (<a href="https://www.nyse.com/quote/XNYS:GFL" target="_blank">NYSE:GFL</a>) on Monday announced the opening of their RNG plant in Wisconsin.