Copperbelt Energy Corporation (CEC), Zambia’s largest supplier of power to the mining sector, is seeking to extend its long-term power supply agreement with Zesco before the current deal expires next year.According to sources close to the transaction, Zesco is reluctant to extend the 20-year Bulk Power Supply Agreement (BSA), creating uncertainty over the future of CEC. Zesco would prefer short-term agreements of about five years, with other clauses that make the deal more favourable to CEC to be renegotiated.