Section 8
SEC. 8. Said grantee shall file its acceptance of this franchise with the Secretary of Commerce and Communications within one hundred and twenty days from the date when it obtained the certificate required by section one of this Act, and shall commence work, which shall be carried on under the supervision and subject to the approval of the electical engineer of the Public Utility Commission, in accordance with the plans, specifications and estimates previously approved by the Public Utility Commission, within six months' time from and after the date of filing such acceptance, unless prevented by act of God or force majeure, usurped or military power, martial law, riot or civil comotion or other inevitable cause, and shall complete the system and have the same in operation within eighteen months from the date of such acceptance, and shall thereafter maintain a first-class electric light, heat, and power service: Provided, That in consideration of the franchise hereby granted, the grantee shall pay quarterly into the municipal treasury of Jagna, one per centum of the gross earnings of its electrical business during the first twenty years, and two per centum during the remaining thirty years of the life of this franchise.