Science
Related: About this forumThe State of Napa Valley College's Ground Breaking $7.5 million Solar Facility Built in 2009.

Solar installations are ubiquitous now, on desert plains, winery properties and carports. In 2006, they looked like the future.
Rep. Mike Thompson addressed the onlookers that day, calling the project a model and inspiration. Then two students flipped a symbolic power switch, marking what was seen as the beginning of a new energy era for the campus.
At the time, the photovoltaic array was the fifth largest in the United States. The system could generate about 1.2 megawatts of power roughly 40 percent of the campus electricity needs with panels that automatically pivoted with the sun. Officials estimated it would shave about $300,000 a year from PG&E bills.
NVC proudly featured the solar field on the cover of its 2005-06 Report to the Community. Accolades followed. A Korean TV crew came to film a segment in spring 2007, and the 2007-08 Napa County Grand Jury report commended the college for the solar installation as well as a new cooling system that worked by circulating chilled liquid, saying both could serve as national models for reducing emissions.
Some reports predicted a 25-year lifespan for the system. Others said 30. But roughly 15 years after that ribbon-cutting moment, the panels went dark...
...For a while, everything seemed to work smoothly. A 2013 college report on Measure N projects showed the array producing the promised 40 percent of campus electricity, cutting carbon emissions by about 600 tons per year.
Then performance began to slip. By 2017, output had fallen to about one-third of the campus needs, according to a facilities master plan from that year. Maintenance costs climbed as the system aged.
In 2018, SunPower discovered a fault in the wiring and charged the college $160,000 for repairs. By late that year, a report listed the arrays useful life as nearly expired, and administrators floated the idea of relocating it to rooftops or parking lots to free up the land.
THE SWITCH TO FUEL CELLS
As PG&E rates rose and solar output fell, the college sought other solutions. In August 2020, it entered into an agreement with San Jose-based Bloom Energy to install a fuel cell on campus. The system runs on natural gas but converts it through a chemical reaction thats more efficient and less polluting than burning fuel in a conventional generator.
Installed in early 2021, the fuel cell was expected to save the college more than $3 million over 15 years. Bloom would own, operate and maintain it, while the college paid for the energy it produced.
NVC spokesperson Jenna Sanders said the solar panels were decommissioned when the fuel cell came online because they had started leaking, posing a fire hazard. When the college sought repairs, she said, the company responsible for maintenance SunPower had gone out of business and was unavailable. The solar field was deactivated at some point and has not provided any electrical support to the campus in recent years, she said...
What Happened to Napa Valley College's $7.5M Solar Field?
We're going to see a lot more of this in the near future.
The experimental fact is that solar energy has done absolutely zero to address the extreme global heating. It's lipstick on the fossil fuel pig. It was never intended, of course, to address the extreme global heating we now observe. Its purpose was to attack nuclear energy, the last best hope of the human race, something that represents its only, highly dubious "success," if killing the planet can be called "success" even sardonically.
erronis
(22,016 posts)I don't know enough about the costs of different forms of energy production. Obviously there are extremely powerful vested interests in all of them. My little work in nuclear was in the decommissioning - commercial and government - not very instructive.
NNadir
(36,954 posts)...we also need to think - although people seldom do so - about what "cost" means. To often it's looked at the immediate cost of the infrastructure to get a think running, and then the bill that's paid by the user.
From my perspective, this is immoral.
We need to think about the external cost, the cost to the environment, and just as importantly, probably more importantly, the cost to the future.
I lived in California for part of the time that the Diablo Canyon Nuclear Plant was being built, and for years I lived on the power provided by it and San Onofre, the beautiful plant on the drive between LA and San Diego, as well as that generated at Diablo Canyon.
The Diablo Canyon Plant came on line in 1985, two decades before this solar facility now rotting in the weeds at Napa Valley College was constructed. In paying for the plant, the citizens of California were making a gift to the future. If not destroyed by appeals to ignorance, the plant should last for the rest of my life, as I'm an old man, and then some. Diablo Canyon's physical footprint is about 12 acres and year after year after year after year it produces more electrical energy than all the wind turbines in California. (There are rotting wind farms in California.)
The used nuclear fuel at San Onofre and at Diablo Canyon is a critical resource for the future, no matter how many people want to declare it as "waste."
Table 30 in this report, from NREL (page 65) gives the material costs per kW for a wind turbine, based on size. Note that kW in this case consists of the lie that peak power is independent from capacity utilization. Wind turbines seldom, if ever, produce peak capacity for an extended period of time.
This, I think is obscene, particularly because the overwhelming majority of wind turbines now operating on this planet will be useless junk before 2050, 25 years from now, and that, I'm afraid, is being overly generous. The average lifetime of a wind turbine in Denmark is less than 20 years.
Focusing on "cost," however it's calculated, is myopic. The issue is sustainability, which includes material, land, and lifetime. No energy system can match nuclear power on these scores. None.
The moral issue is the right of the future to exist. I am certainly willing to pay for nuclear plants I will not live to use. We all owe it to give gifts to future generations. For sure, we have been ungenerous thus far, working more like thieves than providers.
erronis
(22,016 posts)I don't know if this short-sighted cost/benefit analysis is something recent. I think not.
In my current neck of the woods, the locals decided to build a dam up in the hills above the villages. They didn't really know what they were doing but there was an active little river running between two pretty steep mountain-sides. So, in the mindset back in the mid 1800s, they put in a nice packed earth dam and it supplied a steady supply of water to the mills downstream. Until one day the dam was overrun and 100s of people and towns and mills were lost.
Added to your costs are also the lost opportunities. Investing heavily in one approach usually means ignoring other alternatives.
Thanks.
hunter
(40,203 posts)Generating my own electricity and dealing directly with technical people when things go wrong are not complications I want in my life.
About a third of my neighbors have large solar installations. In fifteen years how many of these systems will still be running? Twenty five years...? Thirty...?