Ivanpah Solar Power Facility Explained

Ivanpah Solar Electric Generating System
Coordinates:35.57°N -115.47°W
Country:United States
Location:near Ivanpah, San Bernardino County, California
Status:O
Construction Began:27 October 2010[1]
Commissioned:13 February 2014[2] [3]
Cost:$2.2 billion ($ in dollars)
Employees:60[4]
Owner:NRG Energy
BrightSource Energy
Google
Solar Type:CSP
Solar Csp Technology:T
Solar Collectors:173,500
Ps Site Area:3500acres
Solar Site Resource:2,717 kWh/m2/yr
Ps Cooling Source:Air cooling
Ps Units Operational:3
Ps Units Manu Model:Siemens SST-900
Ps Electrical Capacity:Unit 1: 126 MW
Units 2 and 3: 133 MW each.
Planned: 440 MW gross, Build: 392 MW gross, 377 MW net[5]
Ps Annual Generation:856
Ps Label1:Power purchase agreement
Ps Data1:>$0.135 / kWh (estimated)[6]
Ps Electrical Cap Fac:24.1% (2018 actual) / 28.5% (Planned)

The Ivanpah Solar Electric Generating System is a concentrated solar thermal plant in the Mojave Desert. It is located at the base of Clark Mountain in California, across the state line from Primm, Nevada. The plant has a gross capacity of 392 megawatts (MW). It uses 173,500 heliostats, each with two mirrors focusing solar energy on boilers located on three 459feet tall[7] solar power towers.[8] The first unit of the system was connected to the electrical grid in September 2013 for an initial synchronisation test.[9] The facility formally opened on February 13, 2014. In 2014, it was the world's largest solar thermal power station.[10] [11]

The $2.2 billion facility was developed by BrightSource Energy and Bechtel.[12] The largest investor in the project was NRG Energy which contributed $300 million. Google contributed $168 million.[13] The United States government provided a $1.6 billion loan guarantee and the plant is built on public land. In 2010, the project was scaled back from its original 440 MW design to avoid disturbing the habitat of the desert tortoise.[14]

Description

The Ivanpah system consists of three solar thermal power plants on of public land near the California–Nevada border in the Southwestern United States.[15] Initially it was planned with 440 MW gross on of land, but then downgraded by 12%. It is near Interstate 15 and north of Ivanpah, California.[16] The facility is visible from the adjacent Mojave National Preserve, the Mesquite Wilderness, and the Stateline Wilderness.[16] It is also very visible from the Primm Valley resort area to the northeast.

Fields of heliostat mirrors focus sunlight on receivers located on centralized solar power towers. The receivers generate steam to drive specially adapted steam turbines.

For the first plant, the largest-ever fully solar-powered steam turbine generator set was ordered, with a 123 MW Siemens SST-900 single-casing reheat turbine.[17] Siemens also supplied instrumentation and control systems.[18] The plants use BrightSource Energy's "Luz Power Tower 550" (LPT 550) technology[19] which heats the steam to 550 °C directly in the receivers.[20] The plants have no storage.[21]

Final approval for the project was granted in October 2010.[22] On October 27, 2010, Governor of California, Arnold Schwarzenegger, Interior Secretary Ken Salazar, and other dignitaries gathered in the Mojave Desert to break the ground for the construction.

The project, which had a total cost of about $2.18 billion,[23] received a $1.6 billion loan guarantee from the United States Department of Energy.[24] The facility developed contracts to sell about two-thirds of the power it generated to the Pacific Gas and Electric Company (PG&E), and the rest to Southern California Edison (SCE).[25] [26]

The largest investor in the project was NRG Energy, a generating company based in Princeton, New Jersey. It contributed $300 million. The project also received an investment of $168 million from Google.[27] However, in November 2011, Google announced that it would no longer invest in the facility due to the rapid decline of the price of photovoltaic systems.[28] [29] $90,000,000 in financing was provided through the EB-5 Investor Immigration program, managed in this case by CMB Regional Centers.[30]

Fossil fuel consumption

The plant burns natural gas each morning to commence operation. The Wall Street Journal reported, "Instead of ramping up the plant each day before sunrise by burning one hour's worth of natural gas to generate steam, Ivanpah needs more than four times that much."[31] On August 27, 2014, the State of California approved Ivanpah to increase its annual natural gas consumption from 328000000cuft of natural gas, as previously approved, to 525000000cuft.[32] In 2014, the plant burned 868000000000BTU of natural gas emitting 46,084 metric tons of carbon dioxide, which is nearly twice the pollution threshold at which power plants and factories in California are required to participate in the state's cap and trade program to reduce carbon emissions.[33] If that fuel had been used in a Combined Cycle Gas Turbine (CCGT) plant, it would have generated about 124 GWh of electrical energy.[34] The facility used that gas plus solar energy to produce 419 GWh of electrical energy (more than three times that of the referenced CCGT plant), all the while operating at well below its expected output. In 2015, the facility showed higher production numbers, with Q1 increases of 170% over the same time period in 2014.[35]

The facility uses three Rentech Type-D water tube boilers and three night time preservation boilers. The California Energy Resources Conservation and Development Commission approved for each a stack " high and 60inch in diameter" and consumption of 242500ft3/h of fuel.[36]

Economic impact

BrightSource estimated that the Ivanpah facility would provide 1,000 jobs at the peak of construction, 86 permanent jobs, and total economic benefits of $3 billion. Elected San Bernardino County Supervisor Brad Mitzelfelt, who represents most of the California Mojave Desert, stated that the "project would create jobs for mostly Las Vegas and electricity for mostly San Francisco".[37]

The project received a $1.6 billion loan guarantee from the United States Department of Energy.[38] According to Synapse Energy Economics, the estimated construction cost for the facility of $5,561.00 per kW fell between that of coal and nuclear power plants.[39] [40] but this does not account for the less favorable capacity factor of solar power.

In November 2014, the facility's investors applied for a $539 million federal grant to finance their federal loan.[41]

Performance

Contracted power-delivery performance of 640 GWh/year from Units 1 and 3 and 336 GWh from Unit 2 was met by 2017, following sharply reduced production in the first few years of operation, particularly in the start-up year of 2014.[42]

In November 2014, the Associated Press reported that the facility was producing only "about half of its expected annual output". The California Energy Commission issued a statement blaming this on "clouds, jet contrails and weather".[43] Performance improved in 2015 to about 650 GWh. However, NRG Energy said in its November quarterly report that Ivanpah would likely not meet its contractual obligations to provide power to PG&E during the year, raising the risk of default on its Power Purchase Agreement.[44] PG&E had a contract to receive 640 GWh/year from Units 1 and 3, while SCE was supposed to receive 336 GWh from Unit 2, at a price of about $200/MWh (20¢/kWh). In March 2016, PG&E agreed not to declare the plant in default for at least four months in return for an undisclosed sum from the owners.[45]

In June 2015, The Wall Street Journal reported, "15 months after starting up, the plant is producing just 40% of [its expected more than a million megawatt-hours of electricity each year], according to data from the U.S. Energy Department."[46] Performance improved dramatically in the second year. CleanTechnica reported with respect to units 1 and 3 that "in 2015, PG&E customers received about 97% of Ivanpah's contracted electrons, which is a massive improvement over its first year".[47]

By 2017, due to improvements, the plant was meeting the contract output requirements.[42] The steam plant was designed for 28.72% gross efficiency. The local irradiance near the area is about 7.4 kWh/m2/day[48] [49] (annual average) for a total solar energy flow in the visible spectrum of 2.717 MWh/m2 yearly.

One heliostat mirror is a 75.6square feet reflecting surface,[50] giving a total of 151.2square feet per heliostat. The total plant heliostat reflecting surface results in 173,500 heliostats × 14.05 m2/heliostat = 2,437,144 m2. If the mirrors could always be perpendicular to Sun's ray, based on irradiance, the intercepted solar energy flow is 2.717 MWh/m2/year × 2,437,144 m2 = 6,621,720 MWh yearly.[51]

May 2016 fire

On May 19, 2016, a small fire was reported when misaligned mirrors reflected sunlight into a level of Unit 3 tower not designed to collect power, requiring the tower to shut down for repairs. As another of the three power-generating units was already offline for scheduled maintenance, the plant was left with only one third of its installation functional.[52] Unit 3 resumed operation on June 8, 2016. All three units were back in operation by June 20, 2016. Solar thermal electricity production in California peaked at 703 MW on that day,[53] up from 452 MW on June 7 when two units were offline.[54]

Awards

In August 2014, Ivanpah was awarded the "Plant of the Year" award from Power magazine.[55] In February 2012, Ivanpah was awarded the CSP (Concentrating Solar Power) Project of the Year by Solar Power Generation USA.[56]

Environmental impacts

The project generated controversy because of the decision to build it on ecologically intact desert habitat.[57] The Ivanpah installation was estimated, before operations started, to reduce carbon dioxide emissions by more than 400,000 tons annually. It was designed to minimize impacts on the natural environment compared to some photovoltaic solar facilities because the use of heliostats does not require as much grading of the land.[56] The facility was fenced off to keep out some terrestrial wildlife. However, birds faced the risk of collision with the heliostat mirrors or from burning in solar flux created by the mirror field.[58] [59]

In 2012, the National Parks Conservation Association (NPCA) issued a report on the project, citing water concerns, damage to visual resources, and impacts on important desert species. To conserve scarce desert water, LPT 550 uses air-cooling to convert steam back into water. Compared to conventional wet-cooling, this results in a 90 percent reduction in water usage. The water is then returned to the boiler in a closed process.[19]

Another potential issue is the effect of mirror glare on airplane pilots.[60] Additionally, "the power towers have 'receiver units' at their top on which the mirror fields focus their reflected light. During operation, these receiver units become extremely hot, such that they glow and appear brightly lit. ... Because they are high above the ground, these glowing receiver units will be a visible distraction to persons at many of the KOPs [Key Observation Points], including travelers utilizing I-15."

According to the State of California Energy Resources Conservation and Development Commission Opening Briefs regarding this project, "the project itself is visually imposing. It would cover roughly 4000acres, most of which would be covered with mirror fields. The panoramic expanse of mirror arrays would present strong textural contrast with the intact, natural character of the desert floor [and] would rise to a height of roughly 459feet; an additional 10to above that height would consist of lighting to meet Federal Aviation Administration (FAA) requirements."

Desert tortoise

The Ivanpah Solar power project was built on 6sqmi of public land in the south central Mojave Desert.[61] Project construction was temporarily halted in the spring of 2011 due to the suspected impacts on desert tortoises.[62] Construction resumed when the United States Fish and Wildlife Service (USFWS) found the project was not likely to jeopardize the endangered desert tortoise.[63] BrightSource also installed fencing to keep wildlife out of the area.[64] In 2010, the project was scaled back from the original 440 MW design, to avoid building on the habitat of the desert tortoise.[14]

Many desert tortoises found on the site were relocated to other parts of the Mojave Desert. However, environmentalists raised concerns that relocated tortoises were more likely to die due to the stresses involved.[65] [66]

Birds

During the trial of the plant in September 2013, thirty-four dead birds were found at the plant. Fifteen had heavily burned feathers, which staff at the plant referred to as "streamers" because they were burned in flight by the intense radiation from the heliostat mirrors.[67] From February through June 2014, a team of biologists monitoring the number of bird deaths reported a total of 290.[68]

In April 2014, the USFWS reported that 141 dead birds, including peregrine falcon, barn owl and yellow-rumped warbler had been collected at Ivanpah in October 2013. Forty-seven of the birds' deaths were attributed to solar flux.[69] According to a report by the Associated Press, "Ivanpah might act as a 'mega-trap' for wildlife, with the bright light of the plant attracting insects, which in turn attract insect-eating birds that fly to their death in the intensely focused light rays."[70] Bird kill mitigation strategies were considered, including proven, environmentally safe technologies such as avian radars and LRADs to keep birds away from the site, covering ponds to discourage waterbirds from loitering, and clearing additional land around the plant to make it less attractive and more visible to birds in flight.[67] [71] [72] [73] Some of the bird deaths occurred when the plant was in standby-mode, and the mirrors were focused above the tower. This issue was resolved by spreading the focus wider, below damaging intensity.[74]

In April 2015 The Wall Street Journal reported that "biologists working for the state estimated that 3,500 birds died at Ivanpah in the span of a year, many of them burned alive while flying through a part of the solar installment where air temperatures can reach 1,000 degrees Fahrenheit [540 °C]".[75]

In late 2015, Brightsource released the results of the first full year monitoring bird and bat deaths at the Ivanpah solar plant. The company reported that during a year of study supervised by the California Division of Wildlife, the number of observed bird deaths, adjusted upward to account for inefficiencies of the carcass-counting, were around 3,500 bird deaths per year caused by the Ivanpah solar plant. The Ivanpah plant took steps to further reduce bird deaths.[76] [77]

The initial reports of high avian casualties have been disputed ever since initial reports surfaced. In September 2014, for example, Renewable Energy World suggested "With its claim of 28,000 dead birds from Ivanpah, the Associated Press syndicated a story on every front page in America, spreading alarm about concentrated solar power (CSP) plants, which was not grounded in facts, but on one opponent's speculation."[78] [79]

In September 2016, federal biologists said about 6,000 birds die from collisions or immolation annually while chasing flying insects around the facility's towers.[80]

Ivanpah was covered in the 2019 documentary Planet of the Humans.

Production

Ivanpah Solar electric production is as follows (in megawatt-hours, MWh).

Ivanpah 1 (126 MW gross)

Net electricity production (all) [MWh][81]
YearJanFebMarAprMayJunJulAugSeptOctNovDecSunNGTotal
2014 5,632 4,460 4,946 9,130 15,879 23,722 12,277 16,807 19,743 17,455 15,993 5,922151,9660151,966
2015 4,448 16,471 20,010 25,281 12,380 25,126 19,575 23,404 21,333 11,813 16,230 13,904201,0758,902209,975
2016 7,599 23,686 18,427 13,284 26,006 32,875 31,796 24,403 26,860 20,616 19,663 10,440243,47912,176255,655
2017 11,310 11,699 12,283 11,656 28,709 34,797 21,742 23,437 24,803 28,777 14,736 15,577228,13611,390239,526
2018 16,881 9,714 18,825 14,019 19,704 36,206 21,400 26,060 29,267 20,173 18,055 12,172231,14211,334242,476
2019 13,784 2,178 13,823 20,270 20,031 32,266 32,026 32,450 24,140 27,333 16,380 8,356234,6818,798243,037
2020 12,350 17,961 14,547 22,355 33,691 30,616 38,060 33,299 27,324 27,041 18,176 9,713270,94114,192285,133
202113,1037,95819,13224,60927,89623,31916,98826,66424,90415,77722,02712,774223,35711,794235,151
202215,8988,19118,71726,20720,13331,04518,18316,48817,54325,33815,1089,920217,5975,174222,771
Total2,002,374 83,760 2,085,690

Ivanpah 2 (133 MW gross)

Net electricity production (all) [MWh][82]
YearJanFebMarAprMayJunJulAugSeptOctNovDecSunNGTotal
2014 2,167 1,304 5,604 9,596 13,020 15,825 14,350 12,812 14,446 18,157 15,350 6,632129,2640129,263
2015 6,909 8,915 19,585 24,364 17,243 26,206 18,953 23,900 22,628 12,477 22,222 15,642210,5158,529219,044
2016 10,070 17,615 19,436 5,626 0 9,359 33,386 25,281 25,918 20,389 21,012 11,590190,4129,270199,682
2017 13,381 9,220 16,754 13,359 29,201 22,800 22,181 20,204 25,708 29,253 16,577 17,736226,8509,974236,824
2018 13,536 16,429 20,399 21,254 29,246 39,354 20,599 28,467 32,364 21,375 20,436 13,595264,00913,045277,054
2019 15,085 13,207 12,635 19,331 22,647 34,930 33,856 36,735 25,343 30,832 19,310 7,731258,45813,184271,642
2020 16,180 5,044 5,297 21,517 37,645 33,438 39,333 34,852 29,915 26,896 20,827 11,601269,14313,402282,545
202113,81110,76921,34130,29728,08225,52119,69129,71226,24417,02719,54810,302242,09410,251252,345
202216,68310,16721,39027,17735,48733,87123,17817,42023,43228,85917,78011,903261,3336,014267,347
Total2,052,078 83,669 2,135,747

Ivanpah 3 (133 MW gross)

Net electricity production (all) [MWh][83]
YearJanFebMarAprMayJunJulAugSeptOctNovDecSunNGTotal
2014 2,686 3,866 9,409 6,107 15,885 24,728 9,340 14,451 9,562 20,401 15,834 5,587 137,8560137,856
2015 10,531 4,887 17,495 25,659 18,333 26,202 23,153 25,502 22,186 12,681 22,022 15,452215,5738,530224,103
2016 7,770 25,953 20,546 19,539 17,430 23,487 33,667 15,947 29,437 20,307 21,377 12,242236,68411,018247,702
2017 13,164 12,909 21,605 15,574 29,103 40,080 22,471 24,001 24,730 19,755 9,488 10,618231,91311,875243,788
2018 18,456 17,820 19,957 26,787 27,488 40,177 21,198 24,047 30,075 20,848 19,380 10,093266,3389,988276,326
2019 6,342 11,818 21,794 19,744 22,029 34,803 31,638 32,214 23,251 26,683 17,700 9,431246,78410,751257,535
2020 6,818 18,825 13,534 23,023 36,486 32,562 36,500 32,983 28,786 27,625 19,685 11,796275,73312,890288,623
20215,59019,66121,85931,74032,64615,05719,67629,28423,15517,44522,47813,629240,24611,974252,220
202211,22622,71424,67528,16235,88931,17622,99819,17324,21627,80219,03211,973273,6945,352279,046
Total2,124,821 82,378 2,207,199

Ivanpah total (392 MW gross)

Net electricity production (all) [MWh]
YearJanFebMarAprMayJunJulAugSeptOctNovDecSunNGTotal
2014 10,485 9,630 19,959 24,833 44,784 64,275 35,967 44,070 43,751 56,013 47,177 18,141419,085 0419,085
2015 21,888 30,273 57,090 75,304 47,956 77,534 61,681 72,806 66,147 36,971 60,474 44,998627,16125,961653,122
2016 25,439 67,254 58,409 38,449 43,436 65,721 98,849 65,631 82,215 61,312 62,052 34,272670,57532,464703,039
2017 38,305 33,828 50,642 40,589 87,013 97,677 66,664 67,642 75,241 77,805 40,801 43,931 686,89933,239720,138
2018 48,873 43,963 59,181 62,060 76,438 115,737 63,197 78,754 91,706 62,396 57,871 35,860 761,48934,367795,856
2019 35,211 27,203 48,252 59,345 64,707 101,999 97,520 101,399 72,734 84,848 53,478 25,518739,48132,733772,214
2020 35,348 41,830 33,378 66,895 107,822 96,616 113,893 101,134 86,025 81,562 58,688 33,110815,81740,484856,301
2021 32,504 38,388 62,332 86,646 88,624 63,897 56,355 85,660 74,303 50,249 64,053 36,705705,69734,019739,716
2022 43,807 41,072 64,782 81,546 91,519 96,092 64,359 53,081 65,191 81,999 51,920 33,796752,62416,540769,164
Total6,178,828 249,807 6,428,635

Ivanpah was advertised as designed to produce 940,000 MWh of electricity per year, based on its nameplate capacity and assumed capacity factor.[84] In its second year of operation, Ivanpah's production of 653,122 MWh of net electricity was 69.5 percent of this value, ramping up from 44.6 percent in the first year. The commissioning of a new thermal plants requires up to four years to achieve 100% operating level, from the first grid connection to full production.[85] In its seventh year (2020), the annual production was 91.1% of its advertised value.

Ivanpah total annual production

Fossil fuel use

Ivanpah Solar's use of gas is as follows, expressed in million British thermal units (Btu) as reported. For comparison to the above charts, 1 MWh is about 3.4 million Btu.

Ivanpah 1

Natural gas consumption (million Btu)
YearJanFebMarAprMayJunJulAugSeptOctNovDecTotal
2014 31,760 18,369 9,703 22,767 27,198 59,739 37,609 24,261 24,387 14,670 NR NR270,463
2015 8,249 28,789 29,352 43,618 32,783 49,351 50,815 45,301 38,393 20,485 30,577 33,405411,118
2016 25,620 37,072 52,382 27,248 53,663 59,477 59,281 48,803 38,492 32,974 24,621 21,420481,053
2017 28,741 28,074 23,267 40,726 26,001 58,778 52,522 49,036 50,714 20,252 20,901 15,212357,859
2018 36,314 15,816 35,324 24,087 30,421 70,159 63,494 71,117 35,154 29,440 11,153 30,804453,283
2019 38,476 10,505 31,693 41,240 n/a n/a n/a n/a n/a n/a n/a n/a121,914
Total1,942,972

Ivanpah 2

Natural gas consumption (million Btu)
YearJanFebMarAprMayJunJulAugSeptOctNovDecTotal
2014 41,657 13,645 18,319 16,234 21,420 34,324 38,984 22,105 22,100 12,976 13,663 19,446274,873
2015 14,630 19,544 32,438 29,600 42,063 49,999 39,171 43,540 39,894 24,949 33,994 37,370407,192
2016 36,861 29,874 49,996 14,780 0 21,706 52,315 38,057 34,092 34,587 29,525 23,088364,881
2017 28,550 26,091 34,818 60,626 30,140 40,428 43,744 23,295 42,716 28,157 24,562 19,038402,165
2018 32,525 24,106 36,828 23,580 42,921 56,040 52,336 82,818 74,222 28,563 11,882 22,839497,660
2019 42,768 14,567 22,498 39,362 n/a n/a n/a n/a n/a n/a n/a n/a119,195
Total1,923,932

Ivanpah 3

Natural gas consumption (million Btu)
YearJanFebMarAprMayJunJulAugSeptOctNovDecTotal
2014 29,309 18,498 22,532 13,624 25,321 56,292 33,508 26,337 21,487 15,390 NR NR262,298
2015 17,473 8,460 29,072 38,642 43,708 48,695 40,115 60,249 36,547 20,547 44,193 39,975427,676
2016 36,645 41,799 52,801 42,714 27,006 41,573 52,577 22,031 33,361 34,512 29,580 29,875444,474
2017 30,930 27,660 32,173 35,459 26,456 65,677 47,956 43,363 52,544 15,867 11,493 11,945401,523
2018 36,667 28,583 57,746 53,768 7,086 59,954 21,139 35,930 36,435 21,661 5,918 13,448378,335
2019 14,887 22,456 39,329 31,723 n/a n/a n/a n/a n/a n/a n/a n/a108,395
Total1,900,858

Ivanpah total

Natural gas consumption (million Btu)
YearJanFebMarAprMayJunJulAugSeptOctNovDecTotal
2014 102,726 50,512 50,554 52,625 73,939 150,355 110,101 72,703 67,974 43,036 NR NR774,525
2015 40,352 56,793 90,862 111,860 118,554 148,045 130,101 149,090 114,834 65,981 108,764 110,7501,245,986
2016 99,126 108,745 155,179 84,742 80,669 122,756 164,173 108,891 105,945 102,073 83,626 74,3831,290,308
2017 88,221 81,825 90,258 136,811 82,597 164,883 144,222 115,694 145,974 64,276 56,956 46,1951,217,912
2018 105,506 68,505 129,898 110,435 80,428 186,153 136,969 189,865 145,811 79,664 28,953 67,0911,329,278
2019 96,131 47,528 93,520 112,325 n/a n/a n/a n/a n/a n/a n/a n/a349,504
Total5,790,918

NR = Not reported
n/a = Not available

In popular culture

The Ivanpah Solar Power Facility served as inspiration for the HELIOS One solar power plant's physical appearance in the 2010 videogame .[86]

See also

External links

Notes and References

  1. Overton . Thomas W. . August 2014 . Ivanpah Solar Electric Generating System Earns POWERs Highest Honor . https://web.archive.org/web/20150910030316/http://www.bechtel.com/getmedia/25dac6fe-8d63-49d2-8590-7bb9d89131fe/ISEGS-Plant-of-the-Year_Aug-1-2014/ . 2015-09-10 . live . Power . 18 April 2022.
  2. Michael R. Blood and Brian Skolof, "Huge thermal plant opens as solar industry grows", Associated Press, February 13, 2014.
  3. Web site: Update from Ivanpah – May 2013 . Ivanpah Project Is More Than 92 Percent Complete . May 22, 2013 . July 22, 2013 . dead . https://archive.today/20130722173033/http://ivanpahsolar.com/update-from-ivanpah-may-2013 . July 22, 2013 .
  4. Web site: Loan Programs Office: IVANPAH . . 2017-06-01 . ECONOMIC IMPACT: Ivanpah created 1,000 construction jobs and is expected to support 61 permanent jobs. .
  5. Web site: Ivanpah Solar Electric Generating System . National Renewable Energy Laboratory (NREL) . 22 March 2016 . https://web.archive.org/web/20151012092620/http://www.nrel.gov/csp/solarpaces/project_detail.cfm/projectID=62 . 2015-10-12 . dead .
  6. News: Ivanpah: World's Biggest Solar Power Tower Project Goes On-Line - But will more concentrated solar power follow? . Trabish . Herman . . 2014-02-13 . Though Ivanpah’s PPA prices are undisclosed, they are thought to be no less than the $0.135 per kilowatt-hour PPA price for SolarReserve’s 110-megawatt Crescent Dunes project in Nevada, far from DOE’s CSP target price of $0.06 per kilowatt-hour. .
  7. Web site: Ivanpah Solar Electric Generating System Tower 2 - the Skyscraper Center.
  8. Web site: Brightsource Ivanpah . Ivanpahsolar.com . 2011-12-17 . https://web.archive.org/web/20130111010740/http://ivanpahsolar.com/ . 2013-01-11 . dead .
  9. Web site: Business Wire: Ivanpah Solar Electric Generating System Reaches 'First Sync' Milestone . 24 September 2013 . Businesswire.com . 28 November 2014 . https://web.archive.org/web/20141226070345/http://www.businesswire.com/multimedia/home/20130924005388/en . 26 December 2014 . live .
  10. Web site: World largest solar thermal plant syncs to the grid . 26 September 2013 . . 28 November 2014 . https://web.archive.org/web/20141017193243/http://spectrum.ieee.org/energywise/energy/renewables/worlds-largest-solar-thermal-plant-syncs-to-the-grid . 17 October 2014 . live .
  11. http://investors.nrg.com/phoenix.zhtml?c=121544&p=irol-newsArticle&ID=1899656&highlight "World's Largest Solar Thermal Power Project at Ivanpah Achieves Commercial Operation"
  12. News: Solar energy plant in California gets new partner in NRG. PennWell Corporation. 2010-10-28. Power Engineering International. 2010-10-29. https://web.archive.org/web/20110220012015/http://www.powergenworldwide.com/index/display/articledisplay/9766778866/articles/powergenworldwide/renewables/solar/2010/10/NRG-solar-partner.html. 2011-02-20. dead.
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  19. http://www.renewableenergyworld.com/rea/news/article/2009/09/brightsource-bechtel-partner-on-440-mw-ivanpah-csp-project BrightSource & Bechtel Partner on 440-MW Ivanpah CSP Project
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  31. News: High-Tech Solar Projects Fail to Deliver . Wall Street Journal . 12 June 2015 . One big miscalculation was that the power plant requires far more steam to run smoothly and efficiently than originally thought, according to a document filed with the California Energy Commission. Instead of ramping up the plant each day before sunrise by burning one hour's worth of natural gas to generate steam, Ivanpah needs more than four times that much help from fossil fuels to get the plant humming every morning. . 2017-03-07 . https://web.archive.org/web/20170309041253/https://www.wsj.com/articles/high-tech-solar-projects-fail-to-deliver-1434138485 . 2017-03-09 . live . Sweet . Cassandra .
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