The East African nation is Switching to the longer payment period from settlement on delivery, to remove the need for importers to spend hundreds of millions of dollars every month.
The deals were signed on March 10, Energy Minister Davis Chirchir told a news conference, after these two firms were picked from seven bidders.
Foreign currency traders have cast doubt on the ability of the plan to stem the pressure on the shilling currency, saying it merely amounts to a postponement of demand.
The plan is also being challenged by some private petitioners at the High Court. The court is expected to give its initial directions on the case on Tuesday.
