They do make money from solar. Just not enough to their liking.

Returns on investments in fossil fuels typically range between 10-20 percent, while for a renewables project, 5-8 percent is the norm, Reuters reported in June 2023. “It’s also about the volatility of profitability,” Christophers says. Meanwhile, if the price of the feedstock falls, that usually means fossil fuels are cheaper – and thus the level of profitability can still be maintained. Renewable energy projects in contrast must contend with costs which are largely upfront and have to be met regardless of fluctuations in electricity prices. That makes investment riskier – and therefore costlier, cutting profitability. (source)