Logan City Light & Power
950 West 600 North
Logan, UT 84321
(435) 716-9700

24-Hour Customer Service
(435) 716-9090

LOGAN CITY LIGHT & POWER PLANTS

Take a Tour of our Plants

DIESEL PLANT AND SOCC

Location: 305 South 300 West

Current Combined Capacity: 5,000 kW

Originally constructed in 1929 and add4ed to as needed until the 1940's. Unit 1 has been removed to make room for a control room which was later relocated. Unit's 2 & 3 are non-operational due to inability to acquire parts for a reasonable price and without manufacturing them.

Currently, units 4, 5A, 5B and 6 are operational and their capacity is used to purchase non-firm energy at discount rates for our citizens. They are operated monthly and have been used moderately the past few summers, especially when market prices for power and energy gets expensive.

SOCC, our System Operations Control Center, located at the diesel plant, is where our 24-hour system dispatchers operate. We have one Supervisor, four full-time system dispatchers, and one mechanic/dispatcher. The system dispatchers operate the diesel engines and monitor our electrical system. We have computers that monitor our generating plants and substations and allow remote control of substation and generating plant equipment and devices. They also take 24-hour trouble calls and dispatch light department after hours trouble crews and other departments after-hours personnel for Water and Sewer, street, parks and Solid Waste Departments in Logan City.

HYDRO 3 POWER PLANT

Location: Approximately 2 miles up Logan Canyon (above 2nd Dam)

Current Combined Capacity: 1,300 kW

Turbines: 2 each Westinghouse 450 RPM, 875 kVA, 6600 volt synchronous speed

Water Source: Logan Canyon Third Dam

Pipeline: 1.4 miles of 78 inch reinforced concrete

Surge Tank: 32 foot diameter, 25 foot high concrete

Penstock: 375' 72" steel pipeline and bifurcation

This hydro plant was originally built in about 1903. It was the entire supply of electricity for Logan City's Electric Utility. It was the electricity from this plant that enable Mayor Lorenzo Hansen to compete with the Hercules Power Company who served Logans' residents with electricity before the plant was built.

The Hercules company had been charging a flat rate of $1.25 per month for the first light bulb and 50 cents per month for each additional 40 watt lamp. After the city authorized $65,000.00 in bonds, they charged 35 cents per 40 watt lamp or 3 lights for $1.00 a month and eventually won over the competition by providing better service at lower rates.

In 1929 and again during the mid 1950's, the plant was reconstructed and enlarged. During the 1950 reconstruction, they replaced the old wood stave pipeline with the existing concrete pipeline and penstock, and installed the existing turbines and generators. In 1990, the old oil-filled switchgear was replaced with modern vacuum breakers and a remote monitoring system using programmable logic controllers and desktop computers. This plant is now connected through a high-speed fiber optic network to the other hydro plant and the dams to our dispatch center (SOCC) for 24 hour remote monitoring and control. This plant together with the Hydro 2 power plant is currently producing about 10% of Logan's electricity for less that 1 cent per kWh for the residents of Logan.

HYDRO 2 POWER PLANT

Location: In the Mouth of Logan Canyon (At the East end of The Ray Hugie Park).

Current Combine Capacity: 5,700 kW

Turbines: 2 each 1985 Axel Johnson Horizontal Francis

Generators: 2 each Brush Electric 3,000 kVA synchronous

Water Source: Logan Canyon Second Dam

Pipeline: 9,500 feet of 7 foot diameter reinforced concrete

Surge Tank: 32 foot diameter, 52 foot high concrete

Penstock: 530' of 72" steel pipeline and bifurcation

This plant was commissioned in 1985 under Mayor Newell Daines. In 1973 Utah Power and Light abandoned this site in favor of a coal fired plant in Wyoming. The building was used by the Parks Department as a warehouse until the late 1970's/early 1980's when we began the process to build the existing hydro-electric plant here.

After several years of negotiations with various Federal, State, and Local agencies we were able to come to agreements and obtain a license to build and operate a new hydro-electric plant there. As of 1998, the debt service for this plant has been paid for and it is producing electricity for about 1 cent per kWH for Logan's residents.

This plant is also connected through a high speed fiber optic network to the other Hydro electric plant and to our 24-hour dispatch center. This upgraded system was installed during 1997-98. It consists of programmable logic controllers and desktop computers. This allows both of the hydro-electric plants to operate as one efficient and economical system. We have one full-time Hydro Plant Technician who maintains both of the hydro-electric plants along with some technical assistance from our Substation/System technicians.