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Trinity assisted Public Utility District No. 1 of Klickitat County (KPUD) in its efforts to first evaluate project feasibility, then construct a gas processing plant, and finally produce renewable natural gas (RNG) for use as a transportation fuel at its H.W. Hill Landfill Gas Power Plant in Klickitat County, Washington. The Plant previously incorporated two landfill gas power facilities: one facility with five reciprocating internal combustion engines and a second facility consisting of two combustion turbines. The Plant is located within the Roosevelt Regional Landfill property.

Trinity originally prepared a feasibility analysis for the RNG Project in July 2014 that included a discussion of the federal Renewable Fuel Standard (RFS) and California's Low Carbon Fuel Standard (LCFS) regulations and how the use of landfill gas as a transportation fuel is addressed by these regulations. Trinity also calculated the potential LCFS credits and RFS renewable identification numbers (RINs) available from the KPUD landfill gas on a per volume basis and provided KPUD an estimate of the current value of these LCFS credits and RFS RINs.

In June 2017, Trinity prepared a permit application to the Washington State Department of Ecology to convert the landfill gas to RNG using a combination of processes including a “Selexol” process utilizing a solvent mixture for carbon dioxide removal. The RNG Project was completed and commissioned in September 2018, and RNG is currently injected into a nearby natural gas pipeline and sold to customers connected to the pipeline for use as a transportation fuel.

Trinity is currently providing third-party review of the carbon intensity (CI) pathway application process under the LCFS program. Trinity has provided recommendations on the pathway application approach, including providing feedback on the timeline for submitting temporary and provisional fuel pathway requests to CARB, as well as the timeline for submitting the final fuel pathway application package. As part of this effort, Trinity has prepared CI calculations under various scenarios of operating energy requirements and RNG production using the CA-GREET3.0 software as required by the LCFS program.

To read more about the announcement that Puget Sound Energy and the Klickitat PUD have executed a 20 year RNG supply agreement from the H.W. Hill Renewable Natural Gas Project, click here.

For more information about this project or how Trinity can help your organization, please contact Jeff Adkins, PE, Principal Consultant, at 916.273.5127, or Alex Marcucci, Managing Consultant, at 916.273.5133.