“ other hydrokinetic river systems What has happened to similar systems in the East River in NYC and in the Yukon River at Eagle, Alaska? Also one... (read full comment) ” 

Posted on November 23, 2010 at 2:50 PM EST

“ If this strategy were profitable, every utility would already be doing it. Right now, the only "batteries" efficient enough are water reservoirs... (read full comment) ” 

Posted on March 15, 2010 at 1:26 PM EDT

“ let robots be robots This is a nice demonstration project, clearly advancing several robotic technologies, but except as a test "dummies" using a... (read full comment) ” 

Posted on February 12, 2010 at 12:23 PM EST

“ I agree with the thrust of your comment, but you overstate your case against publishers. Even when we have a fully developed e-book market,... (read full comment) ” 

Posted on February 2, 2010 at 12:51 PM EST

“ Critical assumptions missing Missing critical assumptions make cost estimates for new tracks irrelevant and conclusions about them misleading. 1.... (read full comment) ” 

Posted on January 11, 2010 at 3:33 PM EST

“ What "expensive" means depends upon the cost of gasoline, which depends in turn upon our government's response to global warming and energy... (read full comment) ” 

Posted on December 6, 2009 at 12:24 PM EST

“ flexibility This battery offers flexibility that others do not. Assuming cost, energy density, current, durability, and recharge time work out as... (read full comment) ” 

Posted on September 16, 2009 at 11:23 AM EDT

“ Yes. Yes. This seems to be the cheapest way to add solar power to the grid by far. It applies, though, to all existing power generation plants... (read full comment) ” 

Posted on September 4, 2009 at 3:11 PM EDT

+ 2 more comments posted in this discussion

“ also smaller engines Another advantage of an ultracapacitor in a microhybrid is that a much smaller (maybe 1/3 less), lower cost engine can pair... (read full comment) ” 

Posted on August 20, 2009 at 12:13 PM EDT

“ ethanol is only for a transition First, traditional ethanol is only for a transition to cellulosic ethanol. The infrastructure is necessary for a... (read full comment) ” 

Posted on July 9, 2009 at 12:58 PM EDT