Australian federal energy regulator has approved a South Australian (SA) state government bid to temporarily change regulations, ordering two diesel-fired generators in the state to remain available for back-up electricity supply.
French utility Engie last year said it would mothball the 63MW Snuggery and 75MW Port Lincoln generators. The SA's Labor energy minister opposed this, and last month wrote to the Australian Energy Market Commission (AEMC) to request the Australian Energy Market Operator (Aemo) be given powers to direct this capacity into the market if supply is threatened.
The rule change will be enforced until 31 March, and will help secure SA's electricity supply this summer, the AEMC said on 23 January. SA could face load-shedding during cases of reliability shortfalls, especially during extreme weather, without sufficient backup reserves. No objections were received during the fast-tracked process, the AEMC said.
SA is highly dependent on renewable power such as solar and wind, especially after closing its last coal plants in the last decade. Its sole connection to the national electricity market is via links to Victoria state. The 800MW EnergyConnect electricity transmission link to New South Wales is still under construction and has been delayed until July 2027, from an original guidance of 2023.
About 72pc of SA's power consumption was from renewable sources last year, with gas contributing 24pc and imports from Victoria making up 10pc, leaving the state vulnerable to outages if this connection is damaged.
But backup generators are costly to maintain as cheap renewable energy floods the grid, leaving governments stuck between subsidising fossil-fuelled plants or facing politically and economically damaging interruptions to supply.