The Australian Energy Market Operator (AEMO) was forced to intervene in South Australia's electricity market on Anzac Day to guarantee security of the grid as the state recorded record levels of wind energy production.

Wind power peaked at a new high of 1,540 megawatts close to midnight on Tuesday, more than meeting the state's public holiday electricity demand.

The wind production was so high that earlier in the day AEMO took steps to ensure two gas generators remained on.

"A combination of high wind generation and low demand had resulted in the de-commitment of synchronous plants below the required levels," an AEMO spokeswoman said.

AEMO would not confirm which gas generators were subject to AEMO's directions, but the ABC understands they were AGL's Hallett Power Station and one unit at Torrens Island.

A requirement for two large synchronous power stations to remain online at all times was put in place in the aftermath of the September 28 statewide blackout.

In that instance, when South Australia unexpectedly separated from the rest of the National Electricity Market, there were too few synchronous generators operating to keep the grid frequency in balance, forcing lights out across the state.

Synchronous generation is typically provided by gas, coal and hydro power plants. None of the wind farms currently operating in South Australia provide synchronous characteristics.

AEMO's decision to order on two gas generators means their owners will be compensated under special rules, as opposed to taking the prevailing wholesale price for the electricity produced.

The direction for one of the generators remained in place until midday today.

The decision meant AEMO was also forced to constrain the output of two other generators to keep supply and demand in balance.

The market operator would not reveal whether those constrained generators were wind farms.