State-owned electricity producer Eskom sought to demonstrate the economic prudency of running the diesel-fuelled open-cycle gas turbines (OCGTs) harder to mitigate load-shedding during the fourth day of National Energy Regulator of South Africa (Nersa) public hearings into its latest allowable revenue application. Eskom is seeking allowable revenue of R293.4-billion for 2022/23, which would result in a 20.5% tariff hike from April 1 if granted.