Alamosa Solar Generating Project

The Alamosa Solar Generating Plant is a 35.3 MWp (30.0 MWAC) concentrator photovoltaics (CPV) power station, the largest in the world when it was completed, in May 2012.

It is currently the world's third largest operating CPV facility. The output is being sold to Public Service of Colorado, a subsidiary of Xcel Energy, under a long term power purchase agreement.

Facility construction details

The facility consists of 504 dual-axis Amonix 7700 solar tracking systems and Solectria grid-connected 70 kW inverters. Each system supports seven CPV "MegaModules" which are each rated to produce about 10 kWp. Each module contains 1,080 Fresnel lenses to concentrate sunlight 500 times onto multi-junction solar cells, allowing a greater efficiency than conventional photovoltaic power plants.

The facility is sited on 225 acres at an elevation of 7,500 feet in the sunny and cool San Luis Valley, along with several other solar farms. It was built by Mortenson Construction and is the world's largest assembly of Amonix CPV technology.

Ownership, funding, and operations

Construction was financed in September 2011 by a special purpose subsidiary of the Goldman Sachs Group's Cogentrix Energy Power Management with a US$90.6 million loan that is guaranteed by the U.S. Department of Energy. The facility became operational less than 9 months later, in April 2012. In August 2016, Cogentrix sold the project for US$35 million to Korea Electric Power Corporation and its COPA pension fund, both of which are majority held by the South Korean government. Cogentrix Services continues to operate and maintain the facility.

Electricity production +Generation (MW·h) of Cogentrix of Alamosa Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Total 2012 5,528 6,899 7,639 6,521 5,464 5,946 6,850 5,385 3,887 54,119 2013 4,934 4,933 5,051 4,535 6,004 6,422 5,675 6,043 5,851 6,593 4,787 4,764 65,592 2014 4,584 5,143 5,937 4,989 5,690 6,390 5,133 5,899 5,766 5,770 4,851 3,502 63,654 2015 3,358 4,544 6,159 5,504 4,858 6,054 4,187 5,561 5,488 4,404 5,019 3,719 58,855 2016 4,229 5,010 5,309 4,702 5,964 6,523 7,128 4,913 5,543 5,814 4,924 3,789 63,848 2017 2,380 3,707 5,187 5,726 6,750 7,315 6,345 5,310 4,448 5,267 3,360 3,450 59,245 2018 3,068 3,608 4,666 5,655 6,517 7,003 6,104 6,094 5,857 4,368 3,600 2,607 59,148 2019 2,852 3,005 4,476 5,270 5,610 6,310 5,973 6,080 5,019 4,934 3,066 2,235 54,831 2020 2,969 3,128 4,792 5,355 6,219 6,029 6,248 5,093 4,963 3,740 3,222 2,435 54,193Average annual production (years 2013–2020): 59,921

Comparison to flat-panel photovoltaic plants

Findings of a 2013 NREL land use report showed CPV as having the highest land-energy-density potential of any photovoltaic technology surveyed in the United States, requiring an average 2.8 acres/GW·h/yr for power plants larger than 20 MW. Flat-panel fixed and single-axis tracking plants of similar capacity typically used 3.7 and 3.3 acres/GW·h/yr, respectively. Based on current energy production statistics, land use for the 225 acre Alamosa CPV project averages 3.7 acres/GW·h/yr (= 270 MW·h/acre annual production).

Alamosa Solar Generating Project

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