Northern California Power Agency Plans $212 Million Combined-Cycle Plant

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Researched by Industrialinfo.com (Industrial Information Resources, Incorporated; Houston, Texas). Northern California Power Agency (NCPA) (Roseville, California) is developing the White Slough Generating Station combined-cycle power project in Lodi, California. Project scope includes the addition of a 255-megawatt combined-cycle unit addition to the existing 49-megawatt steam-injected gas turbine.

Combined-cycle plants incorporate a combination of fuel-fired turbines with heat recovery steam generators (HRSG) and steam-powered turbines. They can run on either gas or liquid fuels, such as diesel, ethanol, or methanol. Pipeline natural gas usually is the fuel of choice, because of easy delivery and low air emissions. No.2 fuel oil can also be used as a secondary fuel if there is a shortage in the supply of gas to the plant.

Combined-cycle plants can be built with two types of configurations: single-shaft or multi-shaft. Single-shaft plants utilize a gas turbine and steam turbine that are connected, driving the same generator. Multi-shaft requires that the gas turbine and steam turbine are not relying on each other, with each driving its own generator. Other components include a switchyard for electrical interconnection, cooling towers, water treatment facility, plus control and maintenance facilities.

Combined-Cycle Spending Analysis - Currently there are 59 Active Combined-Cycle Projects Valued at $7.16 billion in the U.S. schedule for kick-off in 2006 and beyond. Represented are 26 capital projects valued at $7.08 billion and 33 maintenance projects valued at $83 million. Click image to view spending breakdown by Market Region.

Gas-fired combined cycle plants produce emissions of nitrogen oxide (NOx) and carbon monoxide (CO), which are abated by use of the Selective Catalytic Reduction (SCR) technology within the HRSG. This type of plant can provide large amounts of power and has a fast start-up time on short notice, with operational flexibility.

Combined-cycle technology has the potential to repower existing older plants by replacing the boiler with the use of combustion turbine/HRSG such as is being planned for the Humboldt Bay Power Station in Eureka, California.

The White Slough Generating Station will be operated as a peaking plant, running 20 hours a day. Construction is slated towards the end of 2007, with completion scheduled in the third quarter of 2009.

Northern California Power Agency is a group of customer-owned utilities, with fourteen members and four associated members, which own and operate their own power plants.

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