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Bob McChesney

Thank you. This picture and story worked very well to lift my spirits!

Eric Mair

Hi there and well done to the students.
I am unreservedly in favour of replacing coal-fired power plants with renewable energy and I can, and regularly do, talk for hours on the technology currently available to make this possible.
However, the elephant in the room, along with his 900lb gorilla handler never get talked about. His name is Storage.
There are renewable energy technologies which either don't need storage e.g. hydro and biomass or have storage taken care of e.g. most solar thermal applications, but the most popular and widely recognised disciplines, wind and photovoltaics, don't have any way to mitigate for the variability problem that prevents them from offering base load or dispatchable power to the grid.
There are a number of small scale storage options available under the general heading of "batteries" but these are expensive and have to be replaced fairly regularly and they are limited in their capacity to store power.
There are medium scale options such as flow batteries and some of the more exotic metal halide batteries which are also expensive and carry replacement penalties and capacity limitations, but the real challenge comes at utility scale where we need to store GWh of power and be able to release it as and when it is required i.e. base load or dispatchable power, at an affordable price.
There is currently only one system that is able to meet these specifications and that is pumped hydro but there are serious constraints (mostly environmental) to the deployment of sufficient installations to meet the needs of the growing RE market.
It is clear to me that this is the "Holy Grail" of the successful integration of renewables into our national grids, yet the companies which are trying to research this subject are not receiving the government support they need and there are some very promising possibilities out there.
Take Gravity Power (www.gravitypower.net) as an example. The concept is simple, the components are already in use in separate applications, all the company needs is the funding to put these components together into a viable GW scale storage solution that can be economically deployed almost anywhere. But they aren't getting it because not enough of us have seen far enough into the future to see that storage is essential once the penetration of renewables (wind and PV) reaches the 20% or so mark.
This type of storage facility also has applications in the coal-fired community which needs to be able to shift loads from day time to night. A utility scale storage system can do that and help reduce the emissions from coal plants by keeping them running at economical outputs 24/7, storing any excess power for later use instead of dialing the power plants back because of reduced demand to the point where they are running hopelessly efficiently and pumping even higher volumes of GHGs into the atmosphere.
The much vaunted "smart grid" won't be so "smart" either without storage to smooth the flow of renewable energy into the system.
So how can we get some essential funding to these storage research companies? Because if we don't find a viable storage solution, much of what we are proposing in terms of renewables just won't be able to meet the demand when the rubber hits the road.


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