State-owned power utility Eskom has raised its salary increase offer to trade unions to 5.5% from the 3.5% it proposed last year, a document seen by Reuters showed, though it remains well below what unions are demanding. Eskom has been a long-term drag on Africa’s biggest economy through its electricity cuts and financial woes. But a sharp improvement in the performance of its coal-fired power stations has allowed it to stop implementing nationwide blackouts. It reported its first full-year profit in eight years last financial year.