Washington Idle Reduction Laws and Incentives

State Incentives

Idle Reduction Tax Incentives

Tax incentives are available for the infrastructure and services that support the use of auxiliary power for heavy-duty vehicles weighing more than 14,000 pounds through on-board or stand-alone electrification systems. These incentives offer a business and occupation tax deduction and sales and tax exemption for machinery and equipment used to provide auxiliary power at truck stops. Sales and use tax exemptions are also available for parts and labor necessary to enable heavy-duty diesel trucks to accept power for onboard electrification systems. These exemptions expire July 1, 2015. (Reference Revised Code of Washington 82.04.4338)

State Laws and Regulations

Idle Reduction Weight Exemption

The state's maximum weight limitations do not apply to a vehicle equipped with a fully functional idle reduction system designed to reduce fuel use and emissions from engine idling. The vehicle may exceed the weight limitations by up to 400 pounds. (Reference Washington Administrative Code 468-38-073)