China produces about 80% of all solar panels in the world. Coindicentally or not, it is also the #1 country by coal production; it has the largest number of coal plants of any country (in absolute terms), and the government has recently been ramping up the rate of new coal plant construction after a few years of trying to keep it more or less in check. Most of electricity in China comes from coal (>60%, compared to US’s <20%).

Based on cursory checks of https://ourworldindata.org/energy, https://www.statista.com/statistics/668749/regional-distribu..., whatever sources they use.

For most metrics the country with most people in it will occupy one of the leading spots.

So, India?

Note that the comment was about more than just solar panels.