It depends on how you operationalize the claim and when you start the timer. In 1975, the cost per watt for solar PV modules was $105.70 per watt, when normali

It depends on how you operationalize the claim and when you start the timer. In 1975, the cost per watt for solar PV modules was $105.70 per watt, when normalized for inflation. In 2020, that number was $0.20 per watt. (Source: https://www.iea.org/data-and-statistics/charts/evolution-of-solar-pv-module-cost-by-data-source-1970-2020 https://www.iea.org/data-and-statistics/charts/evolution-of-... ) That a 528x improvement. If the price goes down in half again, quite possible with economies of scale, you have 1000x better in a significant measurement that counts.