Milford Wind Project: Utah Power For California

An update to the original November 2009 article.

An event happening last year near Milford, Utah caught my attention. The first phase of the Milford Wind Corridor Project was completed and is the largest wind facility in Utah and one of the largest in the West. Here is what the official press release had to say:

Located in Millard and Beaver County, Utah, the first phase of the project will generate 203.5 MW of clean energy, making it the largest renewable energy facility in Utah. At a ribbon-cutting event at the project site near the town of Milford, First Wind officials were joined by Utah Lt. Governor Greg Bell, officials with the federal Bureau of Land Management (BLM), state and local officials, as well as officials with the Los Angeles Department of Water and Power (LADWP), the cities of Burbank and Pasadena, and the Southern California Public Power Authority (SCPPA).

The Milford Wind Corridor is the first wind energy facility permitted under the Bureau of Land Management’s Wind Energy Programmatic Environmental Impact Statement (EIS) for Western US states. But why wind power when Utah has plenty of cheap coal? This electricity is bound for California to help achieve the Los Angeles goal of 20 percent renewables by 2010.


Since the original story in November of last year there have been a few events concerning the Milford Wind Project.

February 11, 2010 — Kelsey Mitchell, a senior at Millard High School, will be the first recipient of a one-time scholarship of $3,000 through the First Wind Scholars program. In March the program was expanded to include as many as 10 scholarships for qualified students. In addition, one renewable scholarship of $5,000 for up to four years will be awarded to the most qualified student.

February 24, 2010 — First Wind was recognized during the Excellence in Renewable Energy award in Austin, Texas. The Milford Wind project received the “Reader’s Choice Award” by the readers of, a widely read renewable energy news source.

April 27, 2010 — After a morning visit with Governor Gary Herbert in Salt Lake City, Interior secretary Kenneth Salazar visited Milford High School to congratulate the renewable energy class of Andy Swapp, whose students were instrumental in gathering information used in creation of the 204 megawatt wind farm.

May 9, 2011 — First Wind announced Monday that the construction of the 102-megawatt Milford Wind Corridor Phase II — Milford II — project has been completed and commercial operations have begun.

Why Wind Power?

Milford Wind Turbine Project

Milford Wind Turbine Project

Here are some of the advantages and disadvantages of generating electricity by wind. Perhaps you can think of some I have missed.


  1. Wind turbines do not generate pollution or radioactive waste.
  2. Their construction and installation has less environmental impact.
  3. Individual homes can be supplied independent of power lines, ensuring electricity during natural disasters.
  4. Using larger turbines connected to the grid, power can be generated for large numbers of people.
  5. No non-renewable resources, like coal, natural gas, or oil are consumed.
  6. Wind is a domestic source of power.
  7. No water required (compared with 490 gallons per megawatt-hour for coal).


  1. The cost of electricity is more than coal, natural gas, or nuclear.
  2. Subsidies are required.
  3. An undesirable appearance.
  4. Because of their height, they can be damaged by lightning.
  5. The blades of wind turbines can hit birds.
  6. Some turbines produce noise.

Technical Details

The Milford Wind Project consists of:

  • Generation of 203.5 megawatts.
  • 97 wind turbine generators.
  • A 90-mile transmission line connecting the wind farm to the IPA in Delta, Utah.
  • 13 meteorological towers.
  • A 34.5K volt power underground collection system linking each turbine to the next and to the Facility substation.
  • A Facility collector substation.
  • An interconnection facility at the connection between the Facility transmission line and the IPP substation.
  • A Supervisory Control And Data Acquisition (SCADA) system.

From the press release:

Featuring 97 total wind turbines including 58 Clipper Liberty 2.5 MW wind turbines and 39 GE 1.5 MW wind turbines, the first phase of the project has the capacity to generate clean, wind energy to power about 45,000 homes per year. Managed by the dedicated team at RMT, Inc., construction on the 203 MW first phase of the Milford Wind Corridor project began nearly a year ago in November 2008.

Economic Benefits

The town of Milford and Beaver and Millard counties can harness this energy source to help the local economy.

  • Providing employment through construction jobs and long-term operations and maintenance positions.
  • Leasing land from area residents.
  • During construction and operation, increased use of local goods and services.
  • Reduced dependence on costly imported fossil fuels.
  • Tax revenues received from wind farms.

One of the substantial costs of wind power is building the transmission lines. In the map below the eventual route chosen was the IPP Corridor Route to the west across BLM land.

Milford Wind Corridor Project Map

Milford Wind Corridor Project Map

Rickety signature.

1.3 Billion Wind Turbines Needed to Replace Coal

McFadden Ridge Wind Project

Tennessee wind turbines similar to McFadden Ridge
Tennessee wind turbines similar to McFadden Ridge

Construction of Rocky Mountain Power’s McFadden Ridge I wind project is underway in Albany County, Wyoming, near the towns of McFadden and Rock River. The project consists of 19 General Electric wind turbines, capable of generating a combined 28.5 megawatts of electricity.

See the Update section at the end of this post for a recalculation of the number of wind turbines needed to replace coal.

1.3 Billion Wind Turbines Needed

Now for a little back-of-the-envelope math. The McFadden Ridge project has 19 wind turbines producing 28.5 megawatts of electricity. Each wind generator therefore produces 1.5 megawatts. In the United States in 2007 coal was responsible for generating 2,016,456 gigawatts of power (see USA Electricity Generation 2007 Chart). As 1 gigawatt equals 1,000 megawatts you would need 1.3 billion (2,016,456,000 megawatts / 1.5) wind turbines to replace coal. And coal only accounts for 48% of electricity production.

651 Million More Wind Turbines

Petroleum liquids (49,505,000 megawatts), petroleum coke (16,234,000 megawatts), natural gas (896,590,000 megawatts), and other gases (13,453,000 megawatts) account for a total of 975,782,000 megawatts. To replace these sources of power you would need an additional 650,521,333 wind turbines. In these calculations we are not replacing the 21% of electricity generated from nuclear power. Even so, removing fossil fuels from the equation mandates the need for 2 billion wind turbines. And remember, wind power costs twice as much as electricity from coal.

Growing Electricity Needs

Rocky Mountain Power says:

To meet the growing electricity needs of its customers, Rocky Mountain Power is investing in new generation, transmission and distribution facilities in Wyoming and other states, as well as purchasing the output from wind projects owned by other entities.

These wind projects are to meet the growing electricity needs of its customers, not to replace coal generating plants. Construction of the McFadden Ridge I wind project is not even included in the 2 billion number cited. The wind turbines being constructed today are to meet growing demand, some of which will be met by even more expensive solar power. I would be very careful about trusting politicians that want to eliminate fossil fuels without giving an explanation of how we are going to replace them with the needed 2 billion wind turbines.

But whatever happens, please don’t put me in charge of turbine maintenance.


A co-worker, Josh, pointed out to me that my calculations were wrong. First the 1.5 megawatts output of the wind turbine needs to be multiplied by the number of hours in a year. Then the ratio of the maximum possible output to the typical output, called the capacity factor, needs to be calculated. For our purposes I will use a capacity factor of 30%. So now we arrive at the following:

1.5 megawatts x 24 hours x 365 days x 0.3 capacity factor = 3,942 megawatt hours.

Now with a more realistic divisor we arrive at the number of wind turbines needed to replace coal:

2,016,456,000 megawatt hours / 3,942 megawatt hours = 511,531 wind turbines.

I still don’t want to be in charge of turbine maintenance.

External Articles

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