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Price drops accelerated in 2024, and the article's explanation in a mixture of general economic conditions, but also the build-out of 保障性租赁住房, or 保租房, affordable rental housing is how I see it translated. 
First suggests that rents are high in China, particularly for young people.
https://twitter.com/vshih2/status/16617364359580467261. "First, compared with the East Asian developmental states, China’s economy
https://twitter.com/Brad_Setser/status/1661428203653660679Given that there was no viable electric car that could have been exported into China, the restrictions on domestic production are irrelevant.
Next, China's electricity carbon intensity is within the ballpark of the other major solar PV panel producers: (includes top 4):