Part of the soon-to-be vacated Holden factory in Adelaide is about to be transformed into a temporary power station to help stave off load-shedding blackouts this summer.

But the car industry's closure will help the authorities manage the risk of blackouts in another way.

The exit of a once powerful manufacturing sector will see the state using less electricity, particularly during the all-important summer peak.

The information is contained in the latest Electricity Forecasting Insights published by the Australian Energy Market Operator (AEMO).