SSE has resisted pressure from a combative American activist investor to break itself up through a separation of its renewable power division. The FTSE 100 energy group, which is being targeted by the hedge fund Elliott Management, insisted in a stock exchange announcement yesterday that “no decision” had been made to split itself in two. The Perth-based company was forced to issue the statement after The Daily Telegraph reported on Friday that SSE was close to revealing a plan for a demerger.