Apart from Gridcoin, SolarCoin is my other big investment. The idea is to incentivise clean energy production without the need for government incentives. It's a POS v2 coin with 2% staking rewards, and each 1MWh of solar energy produced is awarded with 1SLR. I have written a few posts about it on steemit, the EU like it, as do the UN and there are a bunch of us that go to crypto and tech conferences talking about it.
A side project electricchain.org are busy making a way to have every solar producer be able to log their energy generation to the SolarCoin blockchain, I actually created the first PoC Raspberry Pi datalogging device that can do that. This data does not exist anywhere today, as such it could become very valuable. The energy sector in general is a big opportunity area for block-chain.
SolarCoin does not compete with other incentives, so there us no reason for people not to claim it, the value should come from broad distribution and network effects.
Crypto investors worry that the SolarCoin Foundation will crash the price as the coin was premined, but this was necessary to make the coin low power usage and to be able to grant the SLR to solar generators; if it's a scam they certainly waited a long time, the coin has been out for over 3 years.
www.solarcoin.org
www.electricchain.org