An act including tagum city, the island garden city of samal, and the municipalities of asuncion, kapalong, new corella, san isidro, and talaingod in the province of davao del norte, and the municipalities of compostela, laak, mabini, maco, maragusan, mawab monkayo, montevista, nabunturan, new bataan, and pantukan in the province of davao de oro to the franchise arera of the davao light and power company, inc., amending for the purpose republic act no. 11515, entitled "an act extending for another twenty-five (25) years the francise granted to the davao light and power company, inc., under republic act no. 8960, entitled 'an act further extending the term of the francise granted to davao light and power company, inc. to construct, operate and maintain an electric light, heat and power system in davao city and the municipalities of carmen, panabo, dujali, and santo tomas, province of davao del norte, for a period of twenty-five (25) years and for other purposes'"