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<blockquote data-quote="tuxgeo" data-source="post: 6778771" data-attributes="member: 61026"><p>Right about the Powerwall, wrong in principle: Yes, Lithium is in short supply -- but lead isn't. </p><p>The main users of backup storage may end up being Electric Utility companies, who can spare the space to house large amounts of deep-cycle lead-based batteries to store power during the day, to be released during peak usage hours. The typical homeowner doesn't have the room for that, but power companies can buy whole building lots, or even sizable acreage, to house their solar-powered energy storage. The space wouldn't be a problem for them, and the shortage of lithium wouldn't apply. </p><p>It's simply a matter of will and pocketbook: is it economically feasible to use solar as an energy source, given that it will need battery backup? Further, what's the replacement cost as the lead-based batteries wear out? This depends partly upon the design, of course. Technological improvements are making batteries better, too. </p><p></p><p>Article: <a href="http://solar-power-now.com/houston-approves-low-cost-solar-project/" target="_blank">Houston is planning to buy solar energy from Hecate Energy at 4.8 cents per kilowatt hour</a>, from a project near Alpine, Texas. </p><p></p><p>Article: <a href="http://www.eenews.net/stories/1060023749" target="_blank">Cheaper than Natural Gas</a>: </p><p>This one lists a project where NV Energy plans to buy solar energy at 4.6 cents per kilowatt hour from SunPower Corp., as well as a project where NV Energy plans to buy solar energy at 3.87 cents per kilowatt hour from First Solar. </p><p></p><p>With SunEdison now producing silicon wafers at 99.9999% purity, we're not going to get further leaps of technological improvements in that direction; but we may see efficiencies arising from the difference between N-doping and P-doping of the silicon, and from economies of scale.</p></blockquote><p></p>
[QUOTE="tuxgeo, post: 6778771, member: 61026"] Right about the Powerwall, wrong in principle: Yes, Lithium is in short supply -- but lead isn't. The main users of backup storage may end up being Electric Utility companies, who can spare the space to house large amounts of deep-cycle lead-based batteries to store power during the day, to be released during peak usage hours. The typical homeowner doesn't have the room for that, but power companies can buy whole building lots, or even sizable acreage, to house their solar-powered energy storage. The space wouldn't be a problem for them, and the shortage of lithium wouldn't apply. It's simply a matter of will and pocketbook: is it economically feasible to use solar as an energy source, given that it will need battery backup? Further, what's the replacement cost as the lead-based batteries wear out? This depends partly upon the design, of course. Technological improvements are making batteries better, too. Article: [URL="http://solar-power-now.com/houston-approves-low-cost-solar-project/"]Houston is planning to buy solar energy from Hecate Energy at 4.8 cents per kilowatt hour[/URL], from a project near Alpine, Texas. Article: [URL="http://www.eenews.net/stories/1060023749"]Cheaper than Natural Gas[/URL]: This one lists a project where NV Energy plans to buy solar energy at 4.6 cents per kilowatt hour from SunPower Corp., as well as a project where NV Energy plans to buy solar energy at 3.87 cents per kilowatt hour from First Solar. With SunEdison now producing silicon wafers at 99.9999% purity, we're not going to get further leaps of technological improvements in that direction; but we may see efficiencies arising from the difference between N-doping and P-doping of the silicon, and from economies of scale. [/QUOTE]
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