Biogas Renewable Generation Project

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Learn more about the Proposed Biogas Renewable Generation Project at


Landfill Gas to Energy Project

Existing Scholl Canyon Landfill Gas to Energy Project

In 1994, the City of Glendale developed a gas-to-energy project at Scholl Canyon landfill.  The project captured the naturally-occurring raw landfill gas (LFG) that results primarily from the decomposition of organic waste deposited in the landfill.  The LFG, by state and local regulatory mandate, must be controlled in such a manner as to eliminate the venting to the environment of this volatile heat trapping gas that has high methane content.  This gas is often referred to as a greenhouse gas or GHG.  The accepted control method is the combustion of the raw LFG in a flare, in an engine, or in a turbine, all of which dramatically reduce the overall toxicity and global warming impacts of methane. 

Prior to 1994, the LFG at Scholl Canyon was combusted exclusively in the permitted flares operating at the landfill, which are managed by the Sanitation Districts of Los Angeles County under a Joint Powers Authority agreement with the City of Glendale.  When the gas-to-energy project was developed, the LFG was transmitted via a 5.5 mile pipeline to the Grayson Power Plant where it was blended with natural gas and used as fuel in three older, converted boilers (Units 3, 4 & 5) to generate electricity.  The flares have remained in place and are permitted and operable and act as a secondary point of delivery/control for the gas.  Over the years, the flares have been used, albeit less frequently than before, during maintenance periods, emergency shutdowns, and equipment failures at Grayson.  During the past three years, these types of occurrences have been more frequent as Unit 3 was taken out of service due to age and there have been several major repair projects on Units 4 & 5. 

In the course of compiling the Environmental Impact Report for the proposed Grayson Repowering Project, one particular study area that was included was an evaluation of air quality.  The City assessed the emissions from the proposed Grayson facility as well as from the existing facility for a comparison.  The results indicated that the emissions from the existing, older and mechanically-degraded Grayson generating units presented a higher than acceptable health risk.  The results are included in the EIR on page 9.96 (Table 9-7) and were presented in City Council meetings on February 6 and April 10, 2018.  The City promptly notified the South Coast Air Quality Management District (SCAQMD) of the findings and based on the findings, the City proactively implemented a risk reduction measure and transferred the combustion of the LFG to the secondary location at the landfill flare station.  The City continues to work with SCAQMD on the future handling and control of the LFG.