After Fukushima Meltdown shuts down Nuclear Power Industry Japan turns to Solar Power

Posted by PITHOCRATES - November 10th, 2013

Week in Review

Japan shows how easy it is to go green after the Fukushima Nuclear Power Plant meltdown.  Nuclear power is unsafe.  Coal-fired power plants are too dirty.  So what to do?  Why, go solar, of course (see Kyocera launches 70-megawatt solar plant, largest in Japan by Tim Hornyak posted 11/8/2013 on CNET).

Smartphone maker Kyocera recently launched the Kagoshima Nanatsujima Mega Solar Power Plant, a 70-megawatt facility that can generate enough electricity to power about 22,000 homes.

The move comes as Japan struggles with energy sources as nuclear power plants were shut down after meltdowns hit Tokyo Electric Power Co.’s Fukushima plant in 2011.

Set on Kagoshima Bay, the sprawling Nanatsujima plant commands sweeping views of Sakurajima, an active stratovolcano that soars to 3,665 feet.

It has 290,000 solar panels and takes up about 314 acres, roughly three times the total area of Vatican City.

Wow, 70 megawatts.  Sounds big, doesn’t it?  With 290,000 solar panels on 314 acres.  An installed capacity of 0.22 megawatts per acre.  It must have cost a fortune to build.  And they built it on a bay.  At sea level.  In the shadow of an active volcano.  It would be a shame if that volcano erupts and covers those solar panels in a layer of ash.  Or if another typhoon hits Japan.  An earthquake.  Or a storm surge.  For if any of these things happen those 22,000 homes will lose their electric power.

So how does this compare to the Fukushima Daiichi Nuclear Power Plant?  Well, that plant sits on 860 acres.  And has an installed capacity of 4700 megawatts.  Or the installed capacity of 67 Kagoshima Nanatsujima Mega Solar Power Plants.  And an installed capacity of 5.47 megawatts per acre.  Which is perhaps why they built this on the bay.  Because it is such an inefficient use of real estate in a nation that has one of the highest population densities that they put it on the water.  To save the land for something that has value. 

We used the term ‘installed capacity’ for a reason.  That reason being the capacity factor.  Which is the actual amount of power produced over a given amount of time divided by the maximum amount of power that could have been produced (i.e., the installed capacity).  Nuclear plants can produce power day or night.  Covered in volcanic ash or not.  On a sunny day or when it’s pouring rain.  Which is why a nuclear power plant has a much higher capacity factor (about 90%) than a solar plant (about 15%).  So the actual power people consume from the Kagoshima Nanatsujima Mega Solar Power Plant will be far less than its 70 megawatts of installed capacity.

So in other words, solar power is not a replacement for nuclear power.  Or any other baseload power such as coal-fired power plants.  Power demand will far exceed power supply.  Leading to higher costs as they try to ration electric power.  And a lot of power outages.  Some longer than others.  Especially when powerful typhoons and/or storm surges blow in.  As they often do in the Pacific Ocean.


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