About CT

 

Project No.1

The Agency owns and operates five dual fuel, quick-response Combustion Turbine units (G.E. frame 5). The units are located in the cities of Alameda, Roseville, and Lodi. The units are sources of reserve capacity, spinning reserves, and peaking energy.

 

The plants provide local electric generating resources within the cities, which are then capable of directly serving electrical loads in the event of transmission line outages or other emergencies. Each unit can be operated separately and started remotely from NCPA Central Dispatch in Roseville.

 

Members participating in the Combustion Turbine Project are: the cities of Alameda, Healdsburg, Lodi, Lompoc, Roseville, Santa Clara, Ukiah and the Plumas Sierra Electric Cooperative.

 

Project No.2

The Agency's CT Project Number 2 became operational in April of 1996.  It is located in Lodi and consists of a 49.9 MW steam injected (STIG) General Electric LM-5000 CT unit.  A STIG cycle is a simplified alternative to a combined cycle without the need for a steam turbine, condenser, circulating water loop and cooling tower.  A STIG unit has the advantage of lower capital costs than a combined cycle plant, but still relatively high efficiencies.

NCPA's STIG facility utilizes a heat recovery steam generator (HRSG) to produce steam used to enhance power production, improve efficiency, and reduce the emissions of oxides of nitrogen.  Unlike a conventional combined cycle plant, the steam is used directly in the CT unit instead of a separate steam turbine.  Approximately 120,000 pounds per hour of steam are produced from the HRSG.

Wastewater is reclaimed from the City of Lodi's White Slough water pollution control facility to produce the steam needed for power enhancement and emissions control.  The wastewater is processed to eliminate contaminants before being used in the turbine.

The water treatment processes include mega filtration, reverse osmosis, ultra filtration and de-mineralize polishing.  Following the processes, the treated water is stored in a 120,000-gallon tank until it is needed.  The facility uses approximately 900 gallons per minute of wastewater to produce 120,000 pounds (14,388 gallons) per hour of steam.  The facility is connected to PG&E's transmission system.

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