* China State Grid owns 25 pct of Portugal gird firm REN (Adds comments on EU regulatory and trade issues): LISBON/PARIS (Reuters) - Shares in Portuguese utility EDP (EDP.LS) jumped as much as 12 percent on Monday, topping the bid price offered by China Three Gorges (CTG), indicating that the market believes there could be a counter offer or a higher price could be extracted from the Chinese state-owned utility.