Rosiere Wind Farm
In 1999, MGE built and today operates a wind farm in the townships of Lincoln and Red River in northwest Kewaunee County, Wisconsin. Each of the 17 turbines can produce 660 kW to provide renewable, Wisconsin-based electricity.
Annual energy production
- 23,000,000 kilowatt-hours annually
- Enough electricity for roughly 3,300 homes (assumes 98% availability and 23% capacity factor)
- Rated power output is 660 kW at 33 mph (optimal operating wind speed)
Average wind speed is 13 to 14 mph (at 110 feet aboveground).
- Cut-in speed: 9 mph
- Cut-out speed: 56 mph
Wind blows predominantly from a west (from the northwest through the southwest) direction.
Manufactured by Beaird Industries, Shreveport, LA, the tubular steel towers are assembled in three sections with internal safety ladder and nacelle access.
- Weight 73.5 tons
- Height 213 feet
- Diameter 12 ft at the base and 6.5 ft' at the top.
Each horizontal axis, up-wind turbine weighs 20 tons (complete nacelle without rotor) and has an expected life of 30 years. They are Vestas V47-660 kW pitch-regulated wind turbines with OptiSlipWhen waste decays anaerobically (without oxygen), as it does in a landfill, it produces as much methane as carbon dioxide. Methane is about 21 times stronger than CO2 as a greenhouse gas. Burning, or “flaring,” the methane converts it to CO2 and drastically reduces the warming caused by the landfill. and OptiTipOptiTip pitch-regulated system controls blades so they are always tilted to the optimal angle for wind conditions. Optimizes production and minimizes noise level..
Three 77' blades (154' rotor diameter) constructed of fiberglass reinforced epoxy and other composite materials.
- Weigh 7 tons
- Spin at 28.5 RPMs
- Manufactured by Vestas Wind Systems A/S, Lem, Denmark.
Yaw drive system
Electric motor driven with wind direction sensor and cable dewinding control. Braking accomplished through friction pads.
The nominal voltage is 690 VAC for the single-speed, variable slip, asynchronous, four-pole induction generator.
Concrete pier 15' to 30' deep with 14' external diameter. Anchor bolts attach tower to the foundation.
Computer-controlled, automatic, independent operation and remote supervision from operations center in Madison. Microprocessor-based monitoring of yaw, hydraulic, ambient conditions, rotation, generator, pitch system, grid, power factor correction, thyristors (generator cut-in) and remote monitoring.
Integrated lightning protection
System consists of lightning receptor points, conductors, grounding system and surge protection for every subsystem.
- 30.5 acres are leased within seven parcels totaling 60.3 acres
- Within the 30.5 acres, 7.4 are used for the foundations, transformers and access roads
- Seven landowners host the turbines
The grid interconnection is 690-volt cables to 750-kilovolt ampere (kVA) step-up transformers to 24.9-kV collection voltage underground to overhead to 138-kV overhead transmission line.
The brake system consists of a primary and secondary brake.
- Primary: rotor-pitching mechanism (feathers blades)
- Secondary: hydraulic disc brake
The total cost of the project was $14.5 million. The noise level is 47 decibels at 800' downwind.