Pipeline History
Once the effluent injection concept emerged, the key stakeholders formed a public/private partnership to confirm project feasibility and pursue implementation. This core group included LACOSAN and the main geothermal operators in the southeast portion of the Geysers, including Northern California Power Agency (NCPA), Calpine Corporation, Unocal Corporation, and Pacific Gas & Electric Company. (Calpine has since acquired Unocal's and PG&E's interests in the Geysers).
Phase 1 groundbreaking for the project was held on October 6, 1995, and following two years of construction, the pipeline was formally dedicated on October 16, 1997. The total construction cost was $45 million, including $37 million for the pipeline and $8 million in wastewater system improvements. Construction costs were shared by the core participants, known as the Joint Operating Committee (JOC), with additional funding from the California Energy Commission, California Water Resources Control Board, U.S. Department of Energy, US Department of Commerce, US Department of the Interior, and US Environmental Protection Agency. Additionally, the geothermal industry partners invested several million dollars in secondary pipelines to distribute the effluent from the main pipeline to injection wells in the Geysers steamfield.
Phase 2 of the project began in 1999 with extension of the pipeline from LACOSAN's Southeast Treatment Plant to the Clearlake Oaks' treatment plant at a cost of approximately $1 million. The Oaks treatment plant is operated by the Clearlake Oaks County Water District, who shared construction costs with the California Water Resources Control Board and LACOSAN. Phase 2 proceeded in 2000 with the construction of the project's first wetland at Lyons Creek near Lakeport. This 22-acre facility contains four wetland cells and a system of interpretive trails and signage for wildlife viewing and education. The Lyons Creek construction cost of $600,000 was shared by LACOSAN and US EPA. The 20-mile Phase 2 pipeline was finished in early 2003 at a total cost of approximately $30 million, which was shared again by the system's co-funding partners.
The JOC members have entered into a 25-year operating agreement wherein LACOSAN operates the pipeline as far as the Middletown Wastewater Treatment Plant/Bear Canyon "0" Pump Station, after which it is industry-operated to its terminus in the southeast Geysers steamfield. LACOSAN pays an annual operation and maintenance (O&M) cost share equivalent to conventional effluent disposal, and the industry partners pay remaining O&M costs based on the quantity of effluent they each receive at their injection wellheads. LACOSAN is responsible for operating the project's wetlands at the NW facility.