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How Sustainable is Stored Sunlight?

How Sustainable is Stored Sunlight?

Tesla_power_wall

One of the constraints of solar power is that it is not always available: it is dependent on daylight hours and clear skies. In order to fill these gaps, a storage solution or a backup infrastructure of fossil fuel power plants is required — a factor that is often ignored when scientists investigate the sustainability of PV systems.

Whether or not to include storage is no longer just an academic question. Driven by better battery technology and the disincentivization of grid-connected solar panels, off-grid solar is about to make a comeback. How sustainable is a solar PV system if energy storage is taken into account?

In the previous article, we have seen that many life cycle analyses (LCAs) of solar PV systems have a positive bias. Most LCAs base their studies on the manufacturing of solar cells in Europe or the USA. However, most panels are now produced in China, where the electric grid is about twice as carbon-intensive and about 50% less energy efficient. [1] Likewise, most LCAs investigate solar PV systems in regions with a solar insolation typical of the Mediterranean region, while the majority of solar panels have been installed in places with only half as much sunshine.

As a consequence, the embodied greenhouse gas emissions of a kWh of electricity generated by solar PV is two to four times higher than most LCAs indicate. Instead of the oft-cited 30-50 grams of CO2-equivalents per kilowatt-hour of generated electricity (gCO2e/kWh), we calculated that the typical solar PV system installed between 2008 and 2014 produces close to 120 gCO2e/kWh. This makes solar PV only four times less carbon-intensive than conventional grid electricity in most western countries.

…click on the above link to read the rest of the article…

 

 

Muskular Magic

Muskular Magic

 

Elon Musk, Silicon Valley’s poster-boy genius replacement for the late Steve Jobs, rolled out his PowerWall battery last week with Star Wars style fanfare, doing his bit to promote and support the delusional thinking that grips a nation unable to escape the toils of techno-grandiosity. The main delusion: that we can “solve” the problems of techno-industrial society with more and better technology.

The South African born-and-raised Musk is surely better known for founding Tesla Motors, maker of the snazzy all-electric car. The denizens of Silicon Valley are crazy about the Tesla. There is no greater status trinket in Northern California, where the fog of delusion cloaks the road to the future. They believe, as Musk himself often avers, that Tesla cars “don’t burn hydrocarbons.” That statement is absurd, of course, and Musk, who holds a degree in physics from Penn, must blush when he says that. After all, you have to plug it in and charge somewhere from the US electric grid.

Only 6 percent of US electric power comes from “clean” hydro generation. Another 20 percent is nuclear. The rest is coal (48 percent) and natural gas (21 percent) with the remaining sliver coming from “renewables” and oil. (The quote marks on “renewables” are there to remind you that they probably can’t be manufactured without the support of a fossil fuel economy). Anyway, my point is that the bulk of US electricity comes from burning hydrocarbons, and then there is the nuclear part which is glossed over because the techno-geniuses and politicians of America have no idea how they are going to de-commission our aging plants, and no idea how to safely dispose of the spent fuel rod inventory simply lying around in collection pools. This stuff is capable of poisoning the entire planet and we know it.

…click on the above link to read the rest of the article…

 

Tesla launches Powerwall home battery with aim to revolutionize energy consumption

Tesla launches Powerwall home battery with aim to revolutionize energy consumption

Larger version of battery has been tested in pilot program

Tesla CEO Elon Musk is trying to steer his electric car company’s battery technology into homes and businesses as part of an elaborate plan to reshape the power grid with millions of small power plants made of solar panels on roofs and batteries in garages.

Musk announced Tesla’s expansion into the home battery market amid a party atmosphere at the company’s design studio near Los Angeles International Airport. The festive scene attended by a drink-toting crowd of enthusiasts seemed fitting for a flashy billionaire renowned for pursuing far-out projects. For instance, colonizing Mars is one of Musk’s goals at Space X, a rocket maker that he also runs.

Now, he is setting out on another ambitious mission. “Our goal here is to fundamentally change the way the world uses energy,” Musk told reporters gathered in Hawthorne, Calif.

Although Tesla will make the battery called “Powerwall,” it will be sold by a variety of other companies. The list of partners includes SolarCity, a solar installer founded by Musk’s cousins, Lyndon and Peter Rive. Musk is SolarCity’s chairman and largest shareholder.

I don’t believe this product in its first incarnation will be interesting to the average person.– Peter Rive, CTO of Tesla partner SolarCity

…click on the above link to read the rest of the article…

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