Not enough. The more economical it is, the better.
The paradox of solar is that more economical it is for the end users the less money is there to be made. So nobody wants to invest in it.
This was basically solved by massive subsidies from the Chinese government.
https://e360.yale.edu/digest/china-clean-tech-developing-cou...
That's solved by either private monopoly charging money to fund investment, or public monopoly raising taxes to fund investment.
The paradox of solar is that more economical it is for the end users the less money is there to be made. So nobody wants to invest in it.
This was basically solved by massive subsidies from the Chinese government.
https://e360.yale.edu/digest/china-clean-tech-developing-cou...
That's solved by either private monopoly charging money to fund investment, or public monopoly raising taxes to fund investment.