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This book is the best EROI study that has ever been done. It is based on 3 years of real data from all the PV facilities in Spain. According to Charles Hall: Also, too much output can fry electrical components at various locations in the grid. Ferroni and Hopkirk also found measured values considerably less than nameplate values.
As a tenured professor not funded by any special interests, he is one of the most respected, cited, and unbiased scientists writing on EROI. InHall applied this net energy analysis to our own power generation activities, charting the decline of the EROI of US oil as ever more drilling was required to yield a given quantity, and suggesting the possibility that oil may one day take more energy to extract than it yields.
Hall and others have since estimated the EROI for various power sources, a difficult analysis that requires identification of all energy inputs to power production.
EROI is a fundamental thermodynamic metric on power generation. Net energy analysis affords high-level insights that may not be evident from looking at factors such as energy costs, technological development, efficiency and fuel reserves, and sets real bounds on future energy pathways.
It is unfortunately largely absent from energy and climate policy development. Other studies use models, or very limited data further hampered by missing figures about lifespan, performance, and so on that are often unavailable due to the private, proprietary nature of solar PV companies.
Since the Spanish government owned these facilities, the data was made public. And since Prieto built some of them, he also could account for every service and component required to build a solar PV facility.
Models often limit their life cycle or EROI analysis to just the solar panels, which represents only a third of the overall energy embodied in solar PV plants.
Other studies leave out dozens of energy inputs, leading to overestimates of energy such as a payback time of years Fthenakisor exaggerated EROI values of 8.
Prieto and Hall used government data from Spain, the sunniest European country, with accurate measures of generated energy from over 50, installations using several years of real-life data from optimized, efficient, multi-megawatt and well-oriented facilities.
These large installations are far less expensive and more efficient than rooftop solar-PV. Prieto and Hall added dozens of energy inputs missing from previous solar PV analyses. Hall is one of the foremost experts in the world on the calculation of EROI.
We looked at the minimum EROI you need to drive a truck, and you need at least 3: Now, if you want to put anything in the truck, like grain, you need to have an EROI of 5: And that includes the depreciation for the truck.
And then you need an EROI of 7: And if you want education, you need 8: And if you want health care, you need Spain saw much good coming from promoting solar power.
To kick start the solar revolution, the Spanish government promised massive subsidies to solar PV providers at 5.
Eventually it was hoped that solar power would be as cheap as power generated by fossil fuels. Financial Fiasco The gold rush to get the subsidy of 47 Euro cents per kWh began. Because the subsidy was so high, far too many solar PV plants were built quickly — more than the government could afford.
Even before the financial crash of the Spanish government began to balk at paying the full subsidies, and after the crash which was partly brought on by this over-investment in solar PVthe government began issuing dozens of decrees lowering the subsidies and allowed profit margins.
Nor were new jobs, research, and development created, since most of the equipment and solar panels were bought from China. Far more money went into promoting and selling solar investments than research and development. As a result, Abengoa began insolvency proceedings that give the firm just four months to find a buyer or reach an agreement with its creditors.
Abengoa is also developing the MW Mojave Solar project in California, which also used parabolic trough technology. That may soon change.Solar Energy Information. Read the latest news and techniques for efficient solar photovoltaic power, new solar energy systems and more. Nanotechnology encompasses the understanding of the fundamental physics, chemistry, biology and technology of nanometre-scale objects.
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