Provides that, effective June 1, 2009, all state agencies are required to use a minimum of twenty percent biodiesel as compared to total volume of all diesel purchases made by the agency for the operation of the agency's diesel-powered vehicles, vessels, and equipment.

Provides that, effective June 1, 2020, all state agencies are required to use a minimum of thirty percent biodiesel as compared to total volume of all diesel purchases made by the agency for the operation of the agency's diesel-powered vehicles, vessels, and equipment.

Requires the department of general administration to, in consultation with the department of community, trade, and economic development's energy policy division, produce an inventory of large, centralized power plants at state facilities.

Requires state institutions of higher education to cooperate with the department in producing the inventory. The department shall report its findings to the appropriate committees of the legislature by December 1, 2006.

Provides that, effective June 1, 2009, all state public works contracts in excess of ten million dollars shall require the winning bidder of the contract to verify that the contractor and subcontractors will use an average of twenty percent biodiesel as compared to total volume of all diesel consumed in vehicles, vessels, and equipment, used in the performance of the contract.

Provides that, effective June 1, 2020, all state public works contracts in excess of ten million dollars shall require the winning bidder of the contract to verify that the contractor and subcontractors will use an average of thirty percent biodiesel as compared to total volume of all diesel consumed in vehicles, vessels, and equipment, used in the performance of the contract.