Sunpower
SUNPOWER - We Do The Math (a two minute read ) The US uses 4 trillion kilowatts/yr . 4,000,000,000,000 KW/year, or 11,000,000,000 KW/day. There are peaks and troughs from day to day, but the maximum load days are in July when we have the most sunshine, so could reap the most power. Sunlight delivers over 5KW/square meter (thermal) on average in the American Southwest. 11,000,000,000 / 5 = 2,200,000,000 square meters of sunshine needed if solar cells were 100% efficient. And, in 2026, it now outproduces coal power. Inexpensive screen-printed solar cells are 19% efficient , (yes, there are perovskite clay cells with 44% efficiency & other tricks to boost efficiency even further) but those are brand new, so let's go with the off-the-shelf well-proven systems, so we need 2,200,000,000 / 19% = 11,600,000,000 square meters, or ( 2,589,988 square meters per square mile ) 4,479 square miles of standard solar cells. Let's increase that c...