Gas sales (Gwh) Data as at 31 December 2017 Deregulated market: 46.578 GWh. International market: 24.523 GWh. Wholesale business sales: 7.361 GWh. Regulated market: 1.372 GWh. Total: 79.834 GWh.  Gas market customers (thousands) Data as at 31 December 2017 Deregulated market: 1.314 Regulated market: 246 Total: 1.560