The Canadian utility hoping to take over Emera Maine wouldn’t raise Maine customers’ distribution rates before April 2021 and would keep the utility’s workforce intact. Those are two of the pledges from ENMAX, the Calgary, Alberta, utility proposing to buy Emera Maine from its Nova Scotia-based parent, Emera Inc., as it seeks regulatory approval for the transaction. The pledges are part of an agreement released Monday that lays out the proposed terms of the sale.