However, Frederic Lefort, head of business and administrative clients at Engie, one of the main power suppliers, told an event on Thursday that "we don't expect any red alert until the end of 2022".
The government has sent binding instructions to regional government officials, seen by Reuters, which provide details on how to prioritize power allocation. It also urges them to meet local authorities and businesses to make sure all emergency power generators are working.
"Any scheduled outages should not affect more than 4 million users simultaneously," the government said in the instructions, adding that local load shedding measures should not last longer than two hours and will be flagged by RTE at 5 p.m. local time the previous day.
Critical sites such as hospitals can be exempted, the instructions said, while schools should close on days when there are insufficient supplies.