MANY MINDEDThe world's third terawatt of solar took two years. The first took seventy.
Global installed solar capacity passed three terawatts in March 2026. The first terawatt took roughly 70 years, from the silicon solar cell's invention in 1954 to 2022. The second took two years. The third took two years.
That sequence is the cleanest illustration of exponential deployment this project has. A linear reader sees three terawatts and thinks the fourth will take about as long as the third. The record says the interval has been holding at two years while the absolute quantity added per interval keeps rising — which is what compounding looks like from inside. Analysts quoted in the underlying reporting project nine terawatts by 2036, and note that poorer countries are increasingly leading the shift, with developing nations projected to have installed more capacity than wealthy ones by 2036.
One terawatt is roughly enough to power the entire United States. The world has three, and added the most recent one in the time it takes to run a product cycle. The price series underneath that deployment is at manyminded.com/curve/solarModule.
Two pieces of honesty. Installed capacity is not delivered energy — solar runs at a capacity factor well under one, so three terawatts of panels is not three terawatts of continuous supply. And this particular item is a syndicated excerpt: the milestone occurred in March, the original reporting is Yale Environment 360 citing Bloomberg, and today's piece is a repost. The number is real and worth carding; the news is five months old.
Source: HumanProgress