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With reference to your questions:
Q: Any data on RE COOP membership/people in different countries?
ME: You could try here http://www.coopseurope.coop/policy-topic/energy-environment http://www.rescoop.eu/
Q: What % of total RE energy is covered by RE COOPs in each country?
Again, the above sources, perhaps combined with working backwards from overall RES statistics http://www.managenergy.net/focus_on_02_2013_eur_observ_er_report.html
Q: The graph of German RE COOPs is rising from a small base. How many people? How much MWh/yr?
ME: Graph from https://twitter.com/EnergiewendeGER - you could direct your enquiries to them
Good luck with your research! Let us know how you get on