Increases energy efficiency and the use of renewable fuels that reduce the amount of greenhouse gas emissions in the state and provides a public utility tax credit against the taxes owing by utilities for the incentives provided for the implementation by eligible building owners of energy efficiency and renewable energy measures.

Requires the department of commerce to: (1) Establish by rule a state energy performance standard for covered commercial buildings; and

(2) Establish a state energy performance standard early adoption incentive program.

Requires each qualifying utility to administer incentive payments for the state energy performance standard early adoption incentive program.

Allows a light and power business or a gas distribution business a public utility tax credit against certain taxes due.

Requires each gas company to identify and acquire all conservation measures that are available and cost-effective.

Requires the utilities and transportation commission to establish a schedule of annual minimum renewable natural gas acquisition targets for each gas company as a percentage of the company's total quantity sales to retail customers.

Permits a city, town, or county to adopt additional residential energy code requirements as developed by the state building code council.

Requires the state building code council to adopt certain optional efficiency appendices and include them in the state energy code for residential buildings.