Section 7
SEC. 7. The 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 under the supervision and subject to the approval of the electrical engineer of the Public Service Commission and in accordance with the plan, specifications, and estimate previously approved by said Public Service 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 commotion 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 the time during which such grantee has been prevented by any of the causes above referred to from carrying out the terms and conditions of this franchise, shall be added to the time granted by this franchise for the fulfillment of its conditions: Provided, further, That in case of the lease, conveyance, sale, assignment, or giving in usufruct of this franchise and all the property and rights acquired thereunder to any person, association, company, or corporation, the assignee shall pay quarterly into the municipal treasury of Isabela, Occidental Negros, two per centum of the gross earnings of its electrical business during the remainder of the life of this franchise.