Finds and declares that offset contracts and other greenhouse gases mitigation efforts are a recognized utility purpose that confers a direct benefit on the utility's ratepayers. The legislature declares that sections 2 and 3 of this act are intended to reverse the result of Okeson v. City of Seattle, No. 77888-4 (January 18, 2007), by expressly granting municipal utilities and public utility districts the statutory authority to engage in mitigation activities to offset their utility's impact on the environment.