Shape of Things to Come? Huge Concentrating Solar Plant Opens in Mojave Desert.
They say that enough sunshine falls on the Earth in one hour, to meet the demands of the whole planet for a year. But how much area is needed to collect what we need? If we divide the area of the earth (196 million square miles) by the number of hours in a year (8,760), we end up with around 22,500 square miles, a little less than the size of West Virginia.
Â The massive Ivanpah concentrating solar thermal powerâalso called concentrating solar power (CSP)âplant stretches out over five square miles, the largest of its kind in the world, has opened in the Mojave Desert, at a site 45 miles southwest of Las Vegas. The plant, which consists of 350,000 tiltable tracking mirrors, each the size of a garage door, can produce 392 megawatts, enough power to run 140,000 homes. The mirrors are focused on three towers, forty stories tall, each containing a boiler. The steam produced from the concentrated sunlight then drives a turbine-generator, much like the steam from a coal-fired plant would. The three-tower system is more space-efficient than a single tower, requiring 25% less land. The plant is also unique in that it uses far less water than other similar plants. The $2.2 billion complex is jointly owned by NRG Energy, Google, and Oakland-based BrightSource Energy. The plant will sell power to PG&E Corp. and Edison International under a 25-year contract.
Throughout its history, response to the project has teetered on the line between the desire for clean, renewable energy, and the desire to preserve open land. In 2012, the government stepped in to designate 17 "solar energy zones" in areas identified as being less wildlife-sensitive and having fewer natural resources. The zones include about 450 square miles in six statesâCalifornia, Nevada, Arizona, Utah, Colorado and New Mexico.
Despite these precautions, government documents show that dozens of dead birds from sparrows to hawks have been found on the site, some of them with melted feathers. The suspected causes of death include collisions with mirrors and scorching. In November alone, 11 dead birds were found, including two with singed feathers. This was enough for the ever-skeptical Wall Street Journal to refer to the plant as a â$2.2 billion bird-scorching project.â
The bird problem is potentially serious enough to forestall a similar project near the Joshua Tree National Park because of the impact it might have on golden eagles and other protected species.
While the successful commissioning of the plant certainly bodes well for the future of solar energy in America, the question of whether we will be seeing lots more plants like this one is a little harder to answer. Besides the bird issue, which is currently undergoing further study, there is another issue that could effect more decision makers: cost.
In the six years since Ivanpah began construction, the price of solar photo-voltaic (PV) panels has plummeted, and is expected to fall by another third this year. This is quite remarkable, considering the fact that the price of solar PV had already dropped by an astonishing 99% since 1977. This dramatic price drop has caused many people in the industry to change their plans, including Solyndra, which also received funding through the same DOE loan program that helped Ivanpah.
There is, however, one advantage that a CSP plant like Ivanpah holds over conventional PV: storage. Given the conventional boiler architecture, there is no reason a plant like this couldn't be backed up, at night or during cloudy spells with natural gas burners that could continue to heat the water. Or, for that matter, molten salts could also be used to store the heat overnight. The Solana plant in Arizona already does this. Solana was the world's largest CSP plant before Ivanpah came online. But new hybrid PV solar-battery systems with integrated storage are now coming online which will continue to give CSP systems a run for their money.