NIGP 05520: Conversion Kits and Systems for CNG, LPG, etc. Gases

NIGP 05520 Conversion Kits and Systems for CNG, LPG, Etc. Gases, an Item code, covers equipment and systems that convert alternative gaseous fuels—primarily renewable natural gas (RNG), compressed natural gas (CNG), and liquefied petroleum gas (LPG)—for use in vehicles and stationary applications. State and local governments procure under this code chiefly to upgrade vehicle fleets and fuel-production facilities to alternative-gas infrastructure, driven by emissions-reduction mandates and operational cost management. The issuing bodies are county waste and renewable-energy departments and state procurement offices establishing statewide or multi-state cooperative purchasing frameworks. Dane County, Wisconsin, represents the most concrete recent buyer, though most recent solicitations in this code bracket law enforcement vehicle upfit equipment (push bars, partitions, consoles, K-9 enclosures) under related NIGP codes rather than conversion systems per se.

Recent activity centers on Wisconsin and Washington State. Dane County posted an RFP in August 2026 (due September 3, 2026) for replacement of its Renewable Natural Gas facility, specifically upgrading nitrogen and carbon removal units and expanding landfill-gas processing capacity at its Madison facility; the scope includes procurement, construction, and commissioning of current-generation RNG production systems. The Washington State Department of Enterprise Services issued multiple cooperative purchasing agreements for law enforcement vehicle upfit equipment in June 2026 (bid due July 24, 2026) covering Washington and Oregon; while these solicitations touch alternative-fuel vehicle infrastructure tangentially, they are catalogued under separate NIGP codes (055-16, 055-17, 055-20, 055-27, 055-74, 055-91, and 257-88). Sourcewell, a Minnesota local government unit, solicited law enforcement equipment through a multi-jurisdictional RFP (due June 16, 2026) on behalf of participating entities across multiple states, though specific conversion-kit scope is not detailed in the available notice. The code shows limited recent volume; most active procurement is concentrated in landfill-gas and renewable-energy infrastructure modernization rather than fleet-wide conversion deployments.