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Energy Services Department
811 East Red Hills Parkway
St. George, UT 84770
(435) 627-4800

To report water and/or power problems please call (435) 627-4800.

Bloomington Power Plant
Red Rock Power Plant
Gunlock Hydro Plant
Pine Valley Hydro Plant

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Pine Valley Hydro Plant
Pine Valley Hydro Plant
The The Pine Valley Hydro Plant was originally constructed in 1941 and provided power to St. George until 1981. The plant sat idle for a number of years - and was rebuilt on the same location (7 miles North of the city on a culinary water line) and was rededicated in May 1995. The maximum output is 600 kW from an induction motor that is turned by a dual nozzle Pelton Wheel Turbine. The rated flow is 10.5 CFS which is 4712.4 GPM. This type of turbine requires high pressure to be efficient and the system uses a head box 2 miles up the line that is controlled by a Programmable Logic Controller (PLC). The PLC maintains 6' of water in the head box and has a 900' drop in elevation which creates 450 PSI at the plant. The PLC also changes the nozzle opening depending on the water flows to maintain that 6' in the head box, when the flow increases the nozzle opens to compensate. If there is an interruption in power, the plant is programmed to maintain water flow. The nozzles will freeze where they were running and a by-pass valve opens to keep the precious water flowing to St. George residents.
Click on picture for larger image

Pine Valley Hydro

In line view of Pelton Wheel
Turbine housing & Generator
drive coupling

Side view showing nozzle
positions: #1 at top, #2 down
in recess in floor

Control panel in control room
Customer Service Survey