There are many ways to transitionally contribute to green energy but why should you build it with a smart contract? Like what are the actual benefits or the urgency of tokenizing green energy/solar stations? Personally, nowadays it seems like smart contracts are just some another buzzword like the word blockchain whose idealized to solve many real words problems magically.
If you try to raise funds via traditional methods, it is much more difficult as if you want to release your bonds, it will require a lot of documents and different difficult procedures. Nevertheless, if you do it via smart-contract, you can perform it just releasing a new ERC-20 token on Ethereum, what is easy and don't require any documents. The main thing is to organise marketing campaign and ICO so that there will be investors.
Investors today are getting wise unlike before that when developers throw some words like "decentralized" they'd just flock to send ETH to fund the project. Investors are likely to invest more in projects that are already established and a guarantee there will be no rug pull. If you can not even find a logical solution for our token to exist, why would investors see a profit?
Just compare this to a casino token in which the profit of the casino is divided to share with the casino token holders. Releasing NTFS is something else.