Meanwhile, households who do sign up but fail to meet the 270-day feed-in deadline will be given an extra 90 days to supply their solar surplus.
Failure to meet the second deadline will result in cancellation of their contracts, Komkrit said.
He said the new announcement also applied to households who submitted applications to sell solar electricity to the MEA and PEA last year but have not started operations yet.
The two state firms will invite applicants to sign contracts within 30 days, Komkrit added.
He said the policy is aimed at cutting the use of fossil fuel to generate electricity after the Russia-Ukraine war caused energy prices to skyrocket.