Participation in utility green power programs continues to grow across the USA with a number of states and utilities leading the way. According to NREL, the top three utilities in terms of gross kWh sold were:
1. Austin Energy (334,446,101 kWh/year)
2. Portland General Electric (262,142,564 kWh/year)
3. PacifiCorp (191,838,079 kWh/year)

In terms of overall customer participation rates, two utilities could boast 10% of their customer base as being “green power” customers:
1. Lenox Municipal Utilities (14.5%)
2. City of Palo Alto Utilities (10.9%)

It should also be noted that both of these utilities only began offering an option to purchase green power in 2003.

Premiums for green electricity range from about 0.33¢/kWh to 17.6¢/kWh with a median of 2.5¢/kWh.