The new base factor rate is expected to take effect in 2022.
He added that it was too early to tell if power bills would fall or rise after the revision, which was triggered by a change in power-generation technology.
The ERC revises the base factor every three to five years and the fuel tariff (Ft) rate every four months. The base factor is based on the capital expenditure, cost of plant construction, cost of transmission line construction, power distribution and operating costs of the state electricity agencies.