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View Diary: "Climate change: it's even worse than we think." A sobering reality for Thanksgiving ... (114 comments)

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  •  Where did you find these numbers? (1+ / 0-)
    Recommended by:
    JeffW
    Wind is not available 75% of the time, and solar is unavailable 85% of the time (not exact numbers, but you get the point).
    They seem kinda high to me.  

    Renewable energy brings national global security.     

    by Calamity Jean on Thu Nov 22, 2012 at 05:52:31 PM PST

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    •  Made up ... (0+ / 0-)

      illustrative ... and ignoring that wind often blows when the sun isn't shining ... and that with a decent enough grid, one can provide very high predictability with renewable (intermittent) resources spread across a wide-enough geographic expanse.

      Blogging regularly at Get Energy Smart NOW! for a sustainable energy future.

      by A Siegel on Fri Nov 23, 2012 at 07:14:37 AM PST

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      •  Are there any *real* figures on the (0+ / 0-)

        availability of wind and solar power?  I thought that I once saw that wind turbines averaged about 2/3rds of their "nominal" rating.  If that's true, it would require overbuilding wind turbines by only 1.5 times, not 4 times.  And that's without allowing for solar fill-in.  

        Renewable energy brings national global security.     

        by Calamity Jean on Sat Nov 24, 2012 at 10:38:50 AM PST

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        •  Actually ... (2+ / 0-)
          Recommended by:
          JeffW, Calamity Jean

          A reasonable planning figure for US land-based wind installations, at this time, is 40% capacity. (Has been getting better with each year -- there are some facilities going in with plans/expectations of topping 50%. Improvements are combination of better technology and better planning/siting.) Off-shore wind is better.  E.g., using "overbuilding', plan about 2.5 to 1.  

          Think solar about 15-20% and you are in the zone of reasonable.

          Blogging regularly at Get Energy Smart NOW! for a sustainable energy future.

          by A Siegel on Sat Nov 24, 2012 at 08:42:41 PM PST

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