MADRID (Reuters) -Spain is considering introducing a maximum price at which combined-cycle gas plants can sell power to the wholesale market as part of an effort to rein in sky-high consumer electricity bills, Energy Minister Teresa Ribera said on Tuesday. As global energy prices soar, exacerbated by Russia’s invasion of Ukraine, European governments are racing to find solutions ahead of a European Union summit later this week. “The simplest thing to do is to introduce a maximum price at which combined cycle plants can offer (to the market) then have some ex-post adjustment,” Ribera told repor…