By CATHY BUSSEWITZ
HONOLULU (AP) - The state Public Utilities Commission has approved a voluntary program for Hawaiian Electric customers to pay different rates for electricity based on the time of day.
Under the pilot program, customers will pay more for electricity at night when it's more expensive to produce. They'll be charged less during the day when the state's many solar panels reduce the cost of electricity.
Hawaii residents pay the highest electricity rates in the nation.
Delmond Won of the Public Utilities Commission says up to 5,000 customers will be allowed to participate.
Hawaiian Electric spokesman Darren Pai says the program will be available to customers in about a month.
Some solar advocates say the plan could encourage people to install solar systems that store energy for nighttime use.