The relevance of energy storages for an autarky of electricity supply ...
The relevance of energy storages for an autarky of electricity supply ...
The relevance of energy storages for an autarky of electricity supply ...
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Power in Austria is two thirds. 23 <strong>The</strong>re<strong>for</strong>e, the Austria’s potential sums up to<br />
approximately 2.9 TWh. As a result the storage technology is insufficient to conserve<br />
the <strong>electricity</strong> produced during the summer months in order to provide enough<br />
<strong>electricity</strong> in winter, when the <strong>electricity</strong> <strong>supply</strong> curve from REN is lower th<strong>an</strong> the<br />
dem<strong>an</strong>d curve.<br />
In detail, the <strong>supply</strong> <strong>an</strong>d dem<strong>an</strong>d curves follow certain trends over the year. Due to<br />
the increased radiation, <strong>supply</strong> exceeds dem<strong>an</strong>d from April until September. Hence,<br />
storage pl<strong>an</strong>ts are charged during these months. Most <strong>electricity</strong> is fed into the<br />
storage pl<strong>an</strong>ts in April <strong>an</strong>d May, as the <strong>electricity</strong> <strong>supply</strong> is going down <strong>an</strong>d<br />
<strong>electricity</strong> dem<strong>an</strong>d is going up the following months. March <strong>an</strong>d October are turning<br />
points. Within these months, <strong>supply</strong> exceeds dem<strong>an</strong>d during midday but fails to<br />
bal<strong>an</strong>ce over-dem<strong>an</strong>d in the evening hours. As a consequence, <strong>electricity</strong> has to be<br />
partly used from <strong>an</strong>nual storage. As the Renewable Energy Carriers do not produce<br />
enough <strong>electricity</strong> from October until March, <strong>energy</strong> has to be taken from the <strong>an</strong>nual<br />
storage to serve the dem<strong>an</strong>d.<br />
As the potential <strong>for</strong> further development <strong>of</strong> Pumped Hydroelectric Storage is limited<br />
<strong>an</strong>d the maximum potential is insufficient to serve storage dem<strong>an</strong>d in 2050, several<br />
other storage technologies have been assessed. Based on the parameters compared<br />
the Compressed Air Energy Storage <strong>an</strong>d Hydrogen Storage constitute possible<br />
alternatives <strong>for</strong> storing <strong>electricity</strong> on a large scale. Currently only a limited number<br />
<strong>of</strong> these types <strong>of</strong> pl<strong>an</strong>ts exist worldwide. <strong>The</strong>re<strong>for</strong>e, further development will help the<br />
technologies to become mature. To calculate the exact potential <strong>of</strong> CAES <strong>an</strong>d<br />
Hydrogen in Austria further assessment, including geological <strong>an</strong>alysis, would be<br />
necessary.<br />
Figure 6.1 from 2010 shows, that a surplus in <strong>supply</strong> or dem<strong>an</strong>d is partly regulated<br />
by import <strong>an</strong>d export. A higher share <strong>of</strong> thermal power in the winter months bal<strong>an</strong>ces<br />
Hydropower, which produces more <strong>electricity</strong> during the summer months. One c<strong>an</strong><br />
see that the solar <strong>energy</strong> has only a small share in the total <strong>electricity</strong> production in<br />
23 http://www.verbund.com/at/de/haushalte/verbund-hilft-fragen-<strong>an</strong>tworten/wasserkraft-atomstrom-<br />
oekostrom, 23.01.2012<br />
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