The biggest union at South Africa’s Eskom is demanding a wage increase of as much as 15% ahead of negotiations that are set to begin. The National Union of Mineworkers, representing about 15 000 employees at the State-owned utility, has submitted demands before the central bargaining forum, according to Khangela Baloyi, energy sector coordinator for the labour group. The wage demand, which is more than four times the rate of inflation, follows Eskom’s stabilisation of the power grid after years of record blackouts. The utility last week reported its first profit in eight years and plans to raise debt after relying on billions of dollars of government bailouts. South African inflation stood at 3.3% in August.