Nuku'alofa, Tonga 1 July 2026 - Electricity gets noticeably cheaper from today. The Tonga Energy Commission has approved a lower electricity tariff from 1 July 2026, bringing the Regulated Tariff applicable to Tonga Power Limited down from 125.02 to 111.57 seniti per kilowatt-hour (seniti/kWh). That is a fall of 10.8 per cent.