Renewable energy storage

In-Depth: Germany’s 22 GW Solar Energy Record Clean Technica, MAY 31, 2012 BY THOMAS“…….Millions of Batteries in Buildings — Utopian? …… it is very easy to show that it’s just a matter of time until the combination of energy storage for homes with rooftop solar energy and/or small-wind becomes viable and even profitable.

Today, there are still about 6.4 million oil tanks in homes and buildings all over Germany storing energy in the form heating oil. Installing such a tank costs several thousand Euros today. So, why shouldn’t independent power producers start putting up new forms of energy storage in the same numbers as soon as it makes economic sense?

How would 6 million home storage systems change the energy system? Well, 6 million 10 kW / 25 kWh would mean a distributed storage system with 60 GW maximum output/input and 150 GWh of capacity. That’s already enough storage for 10% of the current daily consumption, more than enough to power all German households through the night. It’s also coming a long way to fill the gap between renewable baseload power (hydro and biomass) and variable sources like wind and solar.

That 10-kW/25-kWh battery is not fiction by the way. It’s quite similar to the battery pack that powers the Nissan Leaf right now, Just one battery that will soon reach production volumes in the hundreds of thousands as factories in Japan, Europe, and the US crank up production by 2013.

It’s true that the $15,000 price tag for the battery is too high right now. But, since all kinds of competitors are investing in this market, economics of scale, innovation and optimization will certainly reduce the cost of such batteries in the coming years. In the case of multi-kWh batteries, this development is a lot more obvious than what happened with the price for solar cells just 7 years ago. The fall of prices surprised many analysts back then. Today, prices for solar cells are 70%-80% cheaper than what they were in 2007, putting the cost of solar systems well below $2 per Watt in Germany…. ..

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