Agence France-Presse: Belgian energy firm Electrabel launched a court challenge against a bid to levy hundreds of millions of euros (dollars) in windfall tax on nuclear power companies, a report said on Saturday. “The appeal was launched this week” in a Belgian constitutional court by Electrabel, a subsidiary of the French energy giant GDF Suez, the Belgian firm’s spokesman Fernand Grifnee was quoted as saying by the newspaper l’Echo. GDF Suez’s chief executive Gerard Mestrallet has described the …