. . . and this one in Moos, Germany, where we recently stayed:
http://www.phoenixsolar.com/dms/...Moos/Case%20Study%20-%20Moos.pdf
Though George Monbiot is not a big fan - in the UK at least:
http://www.guardian.co.uk/environment/georgemonbiot/2010/mar/11/solar-power-germany-feed-in-tariff
I see your solar tunnel and raise you a Spanish 24/7 solar power plant...
http://inhabitat.com/video-gemasolar-plant-in-spain-is-the-worlds-first-24hr-solar-plant/