Comparison of Energy Storage Technologies from Solar 2009 Tom Konrad, Ph.D. A reader and  CEO of a fuel cell startup sent me an email asking for a copy of my presentation comparing energy storage technologies which I referred to in last months article on Renewable Energy integration.   Since other readers may be interested as well, here it is: Economic Comparison of Electricity Storage Technologies (Power Point Show, 721 kb) Here is also the spreadsheet where I gathered most of the data for the graphs . (Excel spreadsheet 74 kb) Visual Comparisons These following graphs can also be found in the spreadsheet and presentation.  They all use the same data as the one in the renewable energy integration article, but display it on different axes.  Larger bubbles to the top and right are more economic technologies.     I'm still looking for better data on the economic costs for HVAC based thermal storage, such as that sold by Ice Energy , and would appreciate any information from readers on this.