Unprofitable coal-fired power plants and uncertainty about electricity and natural gas prices and the cost of carbon emission allowances have forced Czech energy firm Sev.en to decide to close three coal plants by March 2027 at the latest. Sev.en, owned by Czech energy investor and billionaire Pavel Tykac, on Wednesday said it would close its coal-fired power plants at Pocerady, Chvaletice, and Kladno at the earliest possible legal deadline, December 2026, or in March 2027 at the latest. The closure of the three major coal plants will remove 2.4…