The franchise granted to NUVELCO the authority to operate an electric light and power service for a period of FIFTY (50) years from June 28, 1979 in the following areas, as follows:
- Ambaguio
- Aritao
- Bagabag
- Bayombong
- Bambang
- Diadi
- Dupax del Norte
- Dupax del Sur
- Kasibu
- Kayapa
- Quezon
- Santa Fe
- Solano
- Villaverde
- Lamut, Ifugao
In later years the municipality of Lamut was waived in favor of the province of Ifugao where it rightfully belongs. Alfonso Castañeda, a new municipality created in honor of a deceased former governor of the province of Nueva Vizcaya and in whose name the new town was named, was included in the franchise area. The municipality is situated in the southeast portion of Nueva Vizcaya. The inclusion of Alfonso Castañeda was made possible by virtue of special request(s) and strong representation of high government officials.
