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Huckabay Ridge Project Collects Manure, Produces Pipeline Gas
| Location |
Stephenville, Texas |
| Project Type |
Centralized |
| Animal Type |
Dairy |
| Population |
Design capacity of up to 10,000 cows |
| Digester Type |
Complete mix |
| Co-Digestion |
Fats, oils, and grease |
| System Designer |
Microgy, a subsidiary of Environmental Power Corporation |
| Biogas Use |
Pipeline Gas |
| Capacity |
1 billion cubic feet of biogas per year at 650,000 MMBtu |
| Receiving Utility |
Lower Colorado River Authority; Pacific Gas & Electric (PG&E) |
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| Photo: Environmental Power Corporation |
In January 2008, a centralized digester developed by Environmental Power Corporation reached full-capacity production levels of pipeline-quality natural gas. The large-scale facility receives manure from multiple farms in the region, digests the manure in controlled and monitored complete mix digesters, and purifies the resulting gas to pipeline quality. Manure solids are separated and composted on site.
Each day, farmers unload about 10 trucks of manure, paying only for transportation. The facility adds water to achieve a solids content of 8-10 percent before the manure enters one of eight 900,000 gallon digesters. Computer controls monitor the digester's chemistry and temperature (120° to 150° F). Fats, oils, and grease collected from restaurants are added to enhance biogas production.
The project includes the following benefits:
- Helps farmers manage manure off site
- Reduces odor
- Generates solids for compost and liquids for fertilizer
- Reduces impacts to the Bosque River Watershed
- Creates marketable carbon offset credits
Huckabay Ridge is expected to produce approximately 650,000 MMBtu of gas per year—the energy equivalent of over 4.6 million gallons of heating oil. The Lower Colorado River Authority has agreed to buy up to 2,000 MMBtu per day through September 2008. In October 2008, Environmental Power plans to sell up to 8,000 MMBtu per day to PG&E in California under a 10-year contract.
Not only have we validated our technology, we have developed many innovative best practices and have gained valuable operating experience. We are applying this enhanced operating knowledge to the other large-scale biogas projects we have under development.
—Rich Kessel, President and Chief Executive Officer of Environmental Power, quoted in an Environmental Power press release
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