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	<title>Comments on: Pump Hydro Underground to Store Wind Power</title>
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	<link>http://cleantechnica.com/2009/09/02/pump-hydro-underground-to-store-wind-power/</link>
	<description>Clean Tech News &#38; Views: Solar Energy News. Wind Energy News. EV News. &#38; More.</description>
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		<title>By: Thomas Cheney</title>
		<link>http://cleantechnica.com/2009/09/02/pump-hydro-underground-to-store-wind-power/#comment-95810</link>
		<dc:creator>Thomas Cheney</dc:creator>
		<pubDate>Fri, 01 Apr 2011 18:09:00 +0000</pubDate>
		<guid isPermaLink="false">http://cleantechnica.com/?p=3287#comment-95810</guid>
		<description>Variability can be a problem when the penetration level of wind as a %  of capacity gets too high.</description>
		<content:encoded><![CDATA[<p>Variability can be a problem when the penetration level of wind as a %  of capacity gets too high.</p>
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	<item>
		<title>By: Thomas Cheney</title>
		<link>http://cleantechnica.com/2009/09/02/pump-hydro-underground-to-store-wind-power/#comment-95809</link>
		<dc:creator>Thomas Cheney</dc:creator>
		<pubDate>Fri, 01 Apr 2011 18:08:00 +0000</pubDate>
		<guid isPermaLink="false">http://cleantechnica.com/?p=3287#comment-95809</guid>
		<description>I think that there is a limited number of sites suitable for pumped hydro storage.</description>
		<content:encoded><![CDATA[<p>I think that there is a limited number of sites suitable for pumped hydro storage.</p>
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	<item>
		<title>By: nb</title>
		<link>http://cleantechnica.com/2009/09/02/pump-hydro-underground-to-store-wind-power/#comment-7169</link>
		<dc:creator>nb</dc:creator>
		<pubDate>Mon, 05 Oct 2009 18:54:08 +0000</pubDate>
		<guid isPermaLink="false">http://cleantechnica.com/?p=3287#comment-7169</guid>
		<description>The Grand Coulee Dam has a system somewhat like this - when electrical demand is low, it uses the power to pump water up a hill to a reservoir to avoid simply wasting electricity as the water must flow through the dam anyway. The water is simply reseased back down the hill through turbines during peak demand periods.



For windmills, I wonder if it might simply be better to have them be pumps (rather like old farm windmills) rather than generate electricity at all. All the electricity could be generated from the water flowing downhill from a reservoir. As I understand it, electric generating windmills require complex variable pitch systems to keep them at a fairly constant speed. In extremely high winds they even have to be &quot;feathered&quot;. A pump will simply pump less or more water depending on the wind. Strong winds will actually help fill the reservoir faster, winds too low to power a generator might still power a water pump - just at a slower rate. The pumping windmill systems might ultimately be simpler and require less maintenance. They might be cheaper as well, although plumbing between all the windmills could perhaps make the system more costly to install.</description>
		<content:encoded><![CDATA[<p>The Grand Coulee Dam has a system somewhat like this &#8211; when electrical demand is low, it uses the power to pump water up a hill to a reservoir to avoid simply wasting electricity as the water must flow through the dam anyway. The water is simply reseased back down the hill through turbines during peak demand periods.</p>
<p>For windmills, I wonder if it might simply be better to have them be pumps (rather like old farm windmills) rather than generate electricity at all. All the electricity could be generated from the water flowing downhill from a reservoir. As I understand it, electric generating windmills require complex variable pitch systems to keep them at a fairly constant speed. In extremely high winds they even have to be &#8220;feathered&#8221;. A pump will simply pump less or more water depending on the wind. Strong winds will actually help fill the reservoir faster, winds too low to power a generator might still power a water pump &#8211; just at a slower rate. The pumping windmill systems might ultimately be simpler and require less maintenance. They might be cheaper as well, although plumbing between all the windmills could perhaps make the system more costly to install.</p>
]]></content:encoded>
	</item>
	<item>
		<title>By: nb</title>
		<link>http://cleantechnica.com/2009/09/02/pump-hydro-underground-to-store-wind-power/#comment-24097</link>
		<dc:creator>nb</dc:creator>
		<pubDate>Mon, 05 Oct 2009 18:54:00 +0000</pubDate>
		<guid isPermaLink="false">http://cleantechnica.com/?p=3287#comment-24097</guid>
		<description>The Grand Coulee Dam has a system somewhat like this - when electrical demand is low, it uses the power to pump water up a hill to a reservoir to avoid simply wasting electricity as the water must flow through the dam anyway. The water is simply reseased back down the hill through turbines during peak demand periods.



For windmills, I wonder if it might simply be better to have them be pumps (rather like old farm windmills) rather than generate electricity at all. All the electricity could be generated from the water flowing downhill from a reservoir. As I understand it, electric generating windmills require complex variable pitch systems to keep them at a fairly constant speed. In extremely high winds they even have to be &quot;feathered&quot;. A pump will simply pump less or more water depending on the wind. Strong winds will actually help fill the reservoir faster, winds too low to power a generator might still power a water pump - just at a slower rate. The pumping windmill systems might ultimately be simpler and require less maintenance. They might be cheaper as well, although plumbing between all the windmills could perhaps make the system more costly to install.</description>
		<content:encoded><![CDATA[<p>The Grand Coulee Dam has a system somewhat like this &#8211; when electrical demand is low, it uses the power to pump water up a hill to a reservoir to avoid simply wasting electricity as the water must flow through the dam anyway. The water is simply reseased back down the hill through turbines during peak demand periods.</p>
<p>For windmills, I wonder if it might simply be better to have them be pumps (rather like old farm windmills) rather than generate electricity at all. All the electricity could be generated from the water flowing downhill from a reservoir. As I understand it, electric generating windmills require complex variable pitch systems to keep them at a fairly constant speed. In extremely high winds they even have to be &#8220;feathered&#8221;. A pump will simply pump less or more water depending on the wind. Strong winds will actually help fill the reservoir faster, winds too low to power a generator might still power a water pump &#8211; just at a slower rate. The pumping windmill systems might ultimately be simpler and require less maintenance. They might be cheaper as well, although plumbing between all the windmills could perhaps make the system more costly to install.</p>
]]></content:encoded>
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	<item>
		<title>By: Dave B</title>
		<link>http://cleantechnica.com/2009/09/02/pump-hydro-underground-to-store-wind-power/#comment-7168</link>
		<dc:creator>Dave B</dc:creator>
		<pubDate>Sat, 03 Oct 2009 20:49:34 +0000</pubDate>
		<guid isPermaLink="false">http://cleantechnica.com/?p=3287#comment-7168</guid>
		<description>Water Current Energy Systems could/should be used or at least considered.

We are somewhat new in the Hydrokinetic game but will be worth watching in the coming months as we are very close to introducing our new Water Current Energy System.

Submerged productive systems. Would prefer velocities of water over 5mph but can operate in less but of course this will also dictate size of systems.

Could be a consideration.</description>
		<content:encoded><![CDATA[<p>Water Current Energy Systems could/should be used or at least considered.</p>
<p>We are somewhat new in the Hydrokinetic game but will be worth watching in the coming months as we are very close to introducing our new Water Current Energy System.</p>
<p>Submerged productive systems. Would prefer velocities of water over 5mph but can operate in less but of course this will also dictate size of systems.</p>
<p>Could be a consideration.</p>
]]></content:encoded>
	</item>
	<item>
		<title>By: Dave B</title>
		<link>http://cleantechnica.com/2009/09/02/pump-hydro-underground-to-store-wind-power/#comment-24096</link>
		<dc:creator>Dave B</dc:creator>
		<pubDate>Sat, 03 Oct 2009 20:49:00 +0000</pubDate>
		<guid isPermaLink="false">http://cleantechnica.com/?p=3287#comment-24096</guid>
		<description>Water Current Energy Systems could/should be used or at least considered.

We are somewhat new in the Hydrokinetic game but will be worth watching in the coming months as we are very close to introducing our new Water Current Energy System.

Submerged productive systems. Would prefer velocities of water over 5mph but can operate in less but of course this will also dictate size of systems.

Could be a consideration.</description>
		<content:encoded><![CDATA[<p>Water Current Energy Systems could/should be used or at least considered.</p>
<p>We are somewhat new in the Hydrokinetic game but will be worth watching in the coming months as we are very close to introducing our new Water Current Energy System.</p>
<p>Submerged productive systems. Would prefer velocities of water over 5mph but can operate in less but of course this will also dictate size of systems.</p>
<p>Could be a consideration.</p>
]]></content:encoded>
	</item>
	<item>
		<title>By: Susan Kraemer</title>
		<link>http://cleantechnica.com/2009/09/02/pump-hydro-underground-to-store-wind-power/#comment-7167</link>
		<dc:creator>Susan Kraemer</dc:creator>
		<pubDate>Tue, 29 Sep 2009 17:14:22 +0000</pubDate>
		<guid isPermaLink="false">http://cleantechnica.com/?p=3287#comment-7167</guid>
		<description>The point of storage is to use wind when it is available; typically at night. Otherwise that gets wasted or sold at cheap night rates.</description>
		<content:encoded><![CDATA[<p>The point of storage is to use wind when it is available; typically at night. Otherwise that gets wasted or sold at cheap night rates.</p>
]]></content:encoded>
	</item>
	<item>
		<title>By: Susan Kraemer</title>
		<link>http://cleantechnica.com/2009/09/02/pump-hydro-underground-to-store-wind-power/#comment-24095</link>
		<dc:creator>Susan Kraemer</dc:creator>
		<pubDate>Tue, 29 Sep 2009 17:14:00 +0000</pubDate>
		<guid isPermaLink="false">http://cleantechnica.com/?p=3287#comment-24095</guid>
		<description>The point of storage is to use wind when it is available; typically at night. Otherwise that gets wasted or sold at cheap night rates.</description>
		<content:encoded><![CDATA[<p>The point of storage is to use wind when it is available; typically at night. Otherwise that gets wasted or sold at cheap night rates.</p>
]]></content:encoded>
	</item>
	<item>
		<title>By: bill</title>
		<link>http://cleantechnica.com/2009/09/02/pump-hydro-underground-to-store-wind-power/#comment-7166</link>
		<dc:creator>bill</dc:creator>
		<pubDate>Tue, 29 Sep 2009 16:21:20 +0000</pubDate>
		<guid isPermaLink="false">http://cleantechnica.com/?p=3287#comment-7166</guid>
		<description>2000 feet is quite a head of water for electrical generation.  Probably needs some pretty special equipment to handle that kind of pressure.  The wind farm would need to generate as much energy as the hydro turbines had generated, to pump the &#039;used&#039; water back up to the resevoir on the surface.  A location with reliable wind at night would need to be selected.</description>
		<content:encoded><![CDATA[<p>2000 feet is quite a head of water for electrical generation.  Probably needs some pretty special equipment to handle that kind of pressure.  The wind farm would need to generate as much energy as the hydro turbines had generated, to pump the &#8216;used&#8217; water back up to the resevoir on the surface.  A location with reliable wind at night would need to be selected.</p>
]]></content:encoded>
	</item>
	<item>
		<title>By: bill</title>
		<link>http://cleantechnica.com/2009/09/02/pump-hydro-underground-to-store-wind-power/#comment-24094</link>
		<dc:creator>bill</dc:creator>
		<pubDate>Tue, 29 Sep 2009 16:21:00 +0000</pubDate>
		<guid isPermaLink="false">http://cleantechnica.com/?p=3287#comment-24094</guid>
		<description>2000 feet is quite a head of water for electrical generation.  Probably needs some pretty special equipment to handle that kind of pressure.  The wind farm would need to generate as much energy as the hydro turbines had generated, to pump the &#039;used&#039; water back up to the resevoir on the surface.  A location with reliable wind at night would need to be selected.</description>
		<content:encoded><![CDATA[<p>2000 feet is quite a head of water for electrical generation.  Probably needs some pretty special equipment to handle that kind of pressure.  The wind farm would need to generate as much energy as the hydro turbines had generated, to pump the &#8216;used&#8217; water back up to the resevoir on the surface.  A location with reliable wind at night would need to be selected.</p>
]]></content:encoded>
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