SolarCoin is the only cryptocurrency that's designed to provide the money supply primarily to solar electricity generators. If you generate solar power, you are eligible to claim SLR as a reward. SolarCoin is currently mineable but the mining phase will end when we switch to Proof-of-Stake in a month or two. And in only a week or two, at block 310,000, a countdown to PoS will begin with the mining reward falling every day. Soon, the only way to get SLR will be to generate solar energy or buy SLR and stake your wallet. So, mine 'em while you can, and buy 'em while they're cheap.