Toey Wattana Mongkhonnam began thinking about outfitting his family home in Thailand’s northeastern province of Yasothon with solar panels during the Covid-19 pandemic. In his household of five, electricity use rises with the day’s heat, and the monthly bill could range from 1,000 to 1,500 baht (US$30 to US$45). “Back then, I checked prices and a rooftop panel system that could put out enough power to run my household’s appliances could cost 100,000 to 200,000 baht,” said Toey, a Muay Thai...
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