NUMSA said the interdict prevents power utililty Eskom from concluding the outstanding renewable energy power purchase agreements. : In a statement on Tuesday morning, NUMSA said the interdict prevents power utililty Eskom from concluding the outstanding renewable energy power purchase agreements. “This is likely to lead to the closure of the coal fired power plants and the impact will be that at least 30 thousand working class families will suffer because of job losses.” New SA energy minister Jeff Radebe was set to sign the 27 independent renewable energy contracts, including power purchase agreements, in Centurion on Tuesday morning.