SECTION 1. Section one of Republic Act Numbered Sixteen hundred and ten is hereby amended to read as follows:
"SECTION 1. Subject to the provisions of the Constitution and to the terms and conditions established in Act Numbered Thirty-six hundred and thirty-six, as amended, and insofar as the latter law is applicable to, and not inconsistent with this Act, there is hereby granted to Negros Electric Power Corporation, hereinafter known as the grantee, for a period of twenty-five years from the approval of this Act, the right, privilege and authority to develop, construct, maintain and operate a hydroelectric power plant and/or thermal units at suitable places for the purpose of generating and distributing electric light, heat, and power for sale within the Province of Negros Occidental."