I can suggest you to check one of my favorite projects for long term - WPP. Green energy is future so this is great opportunity to join in now before planed results come. price is very low atm. Dyor and see full potential of this unique ideas and implementation and developing of real usage.
WPP energy once made a campaign in this forum which at the time was held by Lauda, but after that the WPP project became less viral because it only offered sweet promises without any specific use, so I ignored this project and considered it a bad project.