Eighteen months ago I had a 1.5-kilowatt solar power system installed on the roof of my apartment. I haven't paid a power bill since. The system cost 250,000 baht. Today the same company can install a 1.8-kilowatt system for 233,000 baht; an almost 20% bigger system for 10% less. That means a lot to pay back.
A group of workers install solar power panels to a building on Koh Lan island in Chon Buri. Solar power systems are still largely untapped in sunshine-rich Thailand.
Still, if you look only at the finances, the upfront cost of solar puts the systems in outer space for most people. My original calculations pointed to a more than 40-year payback. Although that was figured without any government help to keep the cost down or the price of electricity increasing over the years.
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