In Sweden, I've been in contact with several companies and associations which are raising small solar farms and selling stocks on them (so, there is a primary market for stocks on renewables). Investment is affordable and transparent and it feels "grass-roots democratic". The problem with solar farms is that this time of the year, they don't produce power. The only green alternative that would produce power is nuclea…
What about wind power which is strong in winter? What about energy storage systems, e.g. using green gas? There seem to be more green options than nuclear power.
About energy storage systems, they fall into "risk investment", i.e., something that venture funds would go for. There is risk capital in Sweden but it is a boutique thing: small amounts, hard to find. The average Sven who can invest wants to invest in something safer. Since the government takes the majority of wage-earners' income in taxes[^1], and thus there is not much disposable income, it's up to the government to step in and finance big and even medium-sized infrastructure, and the same applies to risk profiles.
[1]: 63 cents (öre) on every kronor above the amount equivalent to approx 5000 USD/month that an employer would set apart for wages, including self-wages for self-employed people.