Don't know if it was already mentioned in this forum, but if you generate solar cell power, you can get money for free:
http://solarcoin.orgIt's like Bitcoin, but instead of wasting power for Bitcoin mining rigs, it rewards you for using solar power, only, and you are still free to use the power for what you want. The idea is a positive feeback: If more people are using Solarcoin as money to buy things, or even just convert it to Bitcoin with other people buying it because they believe in the idea, it gets worth more, and the incentive to build more solar cell generators gets higher for a better world.
Interview with the founder Nick Gogerty, by singularity podcaster Nikola Danaylov:
But I guess it still wouldn't make the french solar roadway profitable, if they register it
![Wink ;)](https://www.eevblog.com/forum/Smileys/default/xwink.gif.pagespeed.ic.cldandycH0.png)