Proposed Biogas Renewable Generation Project

Background

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The Biogas Renewable Generation Project proposes approximately 12 megawatts gross power on a three-acre portion of the approximately 95-acre landfill site. The proposed project would beneficially collect and combust the landfill gas onsite as renewable fuel in reciprocating engines for power generation rather than piping it approximately five-miles for combustion in boiler power generation equipment at the existing Grayson Power Plant. 

Location

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The proposed Biogas Renewable Generation Project is located within the boundaries of the existing landfill site at 3001 Scholl Canyon Road, Glendale California, 91206. Regional access to the site is from the Ventura Freeway (State Route 134) at the Figueroa Street exit.

Phases

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Construction of the proposed project will occur over a course of approximately 15 to 18 months through implementation of approximately three phases of development.

Phase I – Demolition and Removal of Existing Equipment. Phase I will be implemented over four to five months and it will entail demolition and removal of existing equipment from the site to make room for the new power plant.


Phase II – Site Grading and Construction. Phase II will begin after Phase I is completed and will be implemented over the next nine to ten months.

◾ To provide water to the Project a one-mile-long, 12-inch steel pipeline will be connected to an existing 16-inch pipeline located north of the landfill on Glenoaks Blvd. The water line will be connected to fire hydrants as required by City of Glendale Fire Department. An additional approximately 150 foot-long water pipeline will be installed to connect the power plant facility with the new water tanks.  

◾This phase will also entail building concrete foundations, delivering and installing electrical generating equipment located within individual enclosures, compressors, landfill gas and condensate conditioning and treatment systems, electrical switchgear and other equipment and construction materials required to build the power plant.

◾Existing landfill condensate and groundwater collection system, piping systems and power lines will be relocated.

◾A single, less than 1,000 square ft. storage building and a less than 1,000 square ft. office will be constructed. Pipes, conduits, and wires will be delivered and installed. A security and fire protection system will also be installed.


Phase III – System Startup. Phase III will begin after Phase II is completed and will be implemented over the next two to three months.

◾Phase III will entail such work activities as sandblasting, priming and painting the facility, delivery of consumables and verifying the operational capabilities of all systems required to make the facility safe and operational.

Demolition Plan

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Demolition and removal of existing equipment from the site would occur to make room for the new power plant. Such equipment and items as tanks, piping, electrical systems, fencing, buildings, and other facilities will be dismantled and removed. The existing concrete foundations and existing asphalt roads would also be demolished. 

Project Benefits

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The proposed project has the following benefits:

  • Provide beneficial use of naturally occurring landfill gas as fuel for power generating equipment.
  • Reduction in greenhouse gas emissions by not flaring the biogas.
  • Utilize the renewable biogas energy resource to help the City of Glendale meet its California mandated Renewable Portfolio Standards requirements.
  • Location within a primarily disturbed landfill site.
  • Use of the existing transmission system to deliver generated electricity into the electrical grid without a need for transmission facility upgrades.
  • Availability of South Coast Air Quality Management District priority reserve air emissions offsets for the project that typically have a lower cost than those purchased on the open market.
  • The existing pipeline from the landfill site to the Grayson Power Plant will be abandoned thereby eliminating the pipeline that runs through residential communities and eliminating long-term maintenance costs associated with use of the pipeline. 

Milestones

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Action  Date Status
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Equipment Layout Plan

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The proposed Biogas Renewable Generation Project would be located adjacent to the existing landfill gas flare station and would include the following major equipment and systems:

• Landfill gas compressors to increase the landfill gas pressure from near atmospheric to the pressures required by the landfill gas treatment system and electrical generation equipment.

• Landfill gas conditioning system to prevent damage to the electrical generation equipment and will consist of vessels, coolers, heat exchangers and control systems designed to remove moisture and unwanted constituents from the landfill gas. The conditioning system will also include a regeneration ground flare that will be instrumental in assuring that the landfill gas conditioning system is performing continuously.

• Condensate treatment system to allow collected condensate to comply with the City of Glendale Industrial Waste Discharge requirements prior to disposing the condensate into existing sewer system.

• Electrical generating equipment consisting of reciprocating engine or turbine generators to produce electricity using the landfill gas as fuel. The electrical generating equipment will be self-contained and located in individual enclosures.

• Combustion exhaust gas cleanup system to comply with South Coast Air Quality Management District regulations, consisting of reactive catalyst using 19% Aqueous Ammonia as reactant to minimize emissions of nitrogen oxides.

• Continuous emission monitoring systems installed on the engines to assure that the exhaust gas emissions are as low as possible and the emissions comply with South Coast Air Quality Management District regulations.

• Electric switchgear to allow connection of the produced electricity to the existing Glendale Water and Power electrical system.

• Small office and small storage building, less than 1,000 square feet each, required for operating and maintaining the Proposed Project.

• Fire protection and safety system to comply with National Fire Protection Association and Glendale Fire Department requirements.

• Two existing 20,000 gallon water storage tanks will be removed and replaced with a new 64,000 gallon water storage tank for domestic water and fire protection water purposes.

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Project Elements

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The proposed Biogas Renewable Generation Project includes an approximately three-acre site which landfill gas would be collected, conditioned, and combusted in reciprocating engines to produce approximately twelve megawatts of gross renewable electricity.

The proposed project includes an approximately two-thirds of a mile (3,500 linear feet) of natural gas pipeline to connect the power generation facility to the existing Southern California Gas Company pipeline system located at the eastern end of Scholl Canyon Drive. This natural gas pipeline would be utilized to augment the landfill gas when the heat content of the landfill gas falls below necessary operating limits for the electrical generating equipment. The natural gas will not make up more than 10% of what is necessary to produce 100% renewable energy.

To provide water to the Project a one-mile-long, 12-inch steel pipeline will be connected to an existing 16-inch pipeline located north of the landfill on Glenoaks Blvd.  The water line will be connected to fire hydrants as required by the City of Glendale Fire Department.  An additional approximately 150 foot-long water pipeline will be installed to connect the power plant facility with the new water tanks located at the Project Site.

The energy produced from the proposed project will be integrated into GWP's power delivery system utilizing the existing electric system connected to the Scholl Substation. 

Overview

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The proposed Biogas Renewable Generation Project is located at an existing Class III nonhazardous landfill that has been accepting waste since the 1960’s. This waste is naturally decomposing and producing landfill gas that includes methane, a greenhouse gas that is combustible and can be put to beneficial use.

Currently, the landfill gas is collected at a central location within the project site where it is compressed, liquids are removed, and the landfill gas is piped to the Grayson Power Plant via an underground dedicated pipeline approximately five-miles in length where it is blended with natural gas then used as fuel in the boilers to make steam to generate electricity for the City of Glendale. 

The Grayson Power Plant is being repowered (see website) and the new turbines cannot use the landfill gas as fuel. The landfill gas is constantly being produced at the landfill and there are only two options currently available: burn it in the air by flares or put the landfill gas to beneficial use by using it as fuel for the generation of renewable electricity.

Landfill gas is considered a renewable energy resource. This will help the City of Glendale achieve the State of California mandate that every utility shall provide a certain portion of renewable energy to their electric generation portfolio. By converting landfill gas to renewable energy the City can receive 100% renewable credit for the energy produced.  Currently, the City is blending the methane gas with natural gas to produce electricity at the existing Grayson Power Plant boilers. The City is only receiving 50% credit for the renewable energy produced because the landfill gas is blended with natural gas, which is not a renewable resource. The City will produce and receive 100% renewable credit by installing generation units that can directly burn the landfill gas at the project site. Combusting and producing electricity at the landfill site will enable the City of Glendale to decommission the approximately five-mile pipeline between the landfill site and the Grayson Power Plant.

Landfill gas will be continually produced at the project site, thus converting this renewable resource to energy will serve the City of Glendale in the years to come. Overall, the Biogas Renewable Generation Project will efficiently collect existing gas from the landfill project site and effectively produce renewable energy even without an expansion to the existing landfill.

FAQ

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Coming Soon!

What is biogas ?

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Biogas is a natural byproduct of the decomposition of organic material in landfills. Biogas is composed of methane (the primary component of natural gas), carbon dioxide (CO2) and a small amount of non-methane organic compounds. The captured biogas, if not put to beneficial use, is typically flared. It can be beneficially used in combination with internal combustion engines, turbines, microturbines, or other technologies to produce renewable electricity. It is also possible to use biogas directly as an alternative for use in vehicles.

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141 North Glendale Avenue

Glendale, California 91206

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