BRUSSELS — Europe’s dreams of becoming an artificial intelligence superpower are bumping into the cold realities of power supplies and public opinion. The European Commission is set to unveil in May plans to triple the bloc’s data center capacity within seven years. Brussels wants to close a gap with the U.S. and China on artificial intelligence and it needs to force a rapid expansion in cloud computing capacity to do that. Amid a public backlash against data centers in the U.S. because of