4/ There is, of course, a global pandemic element to the quietness, and pandemic-induced shutdowns are really not the way to way to get clean air. The same way an economic collapse is really not the best way to get cheap gasoline. https://www.bloomberg.com/news/articles/2020-03-12/don-t-get-too-excited-about-cheap-gas?sref=JMv1OWqN
7/ It all started 16 years before the first Earth Day, in 1954, when Bell Laboratories unveiled the first photovoltaic cell. They called it the “solar battery,” and the ads for it are charming. https://www.bloomberg.com/news/articles/2020-04-23/the-energy-revolution-that-started-in-1954-is-reaching-its-crescendo?sref=JMv1OWqN
8/ “The same kindly rays that help the flowers and the grains and the fruits to grow,” reads one, “also send us almost limitless power.” https://www.bloomberg.com/news/articles/2020-04-23/the-energy-revolution-that-started-in-1954-is-reaching-its-crescendo?sref=JMv1OWqN
10/ Much to be done, indeed. Photovoltaics were wildly expensive, complex to produce, and tiny. There wasn’t even a commercial application for them until 1962 with the Telstar 1, the "first privately sponsored space-faring mission" https://www.nasa.gov/topics/technology/features/telstar.html
12/ Make no mistake, they still weren’t cheap. The earliest data BloombergNEF has on solar costs shows that panels went for more than $100 per watt in 1976. https://www.bloomberg.com/news/articles/2020-04-23/the-energy-revolution-that-started-in-1954-is-reaching-its-crescendo?sref=JMv1OWqN
13/ a few years after the first Earth Day, a pioneering solar homeowner would have had to spend tens of thousands just on panels, not to mention the costs of engineering, installation, and power equipment. https://www.bloomberg.com/news/articles/2020-04-23/the-energy-revolution-that-started-in-1954-is-reaching-its-crescendo?sref=JMv1OWqN
14/ What a difference four decades makes. Last year, one PV panel cost $0.23 per watt—a 99.3% decrease. Entire systems now cost less than what the PV module alone cost just seven years ago. https://www.bloomberg.com/news/articles/2020-04-23/the-energy-revolution-that-started-in-1954-is-reaching-its-crescendo?sref=JMv1OWqN
15/ To put that in context, let’s look at another energy revolution underway prior to Earth Day No. 1: nuclear power.
16/ In 1954, just a few months after Bell Labs brought its Solar Battery to market, Lewis Strauss, the chairman of the U.S. Atomic Energy Commission, gave a speech to the National Association of Science Writers in New York. https://www.nrc.gov/docs/ML1613/ML16131A120.pdf
17/ There’s a key section, one that’s been bandied about often since:

"It is not too much to expect that our children will enjoy in their homes electrical energy too cheap to meter"

https://public-blog.nrc-gateway.gov/2016/06/03/too-cheap-to-meter-a-history-of-the-phrase/
24/ n the U.K. on April 19, electric vehicle charging platform Ohme said that its customers were paid 69 pence to add 130 miles of charge to their vehicles. https://twitter.com/OhmeEV/status/1251958391188205569?s=20
28/ We will end up with PV configurations (like this cow-friendly, morning-and-evening-optimized vertical PV array) that would have seemed ridiculous even 10 years ago, much less 50. https://www.pv-magazine.com/2020/03/30/french-german-alliance-for-vertical-pv/
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