Pumped hydro storage systems are dinosaur-techniques with enormous environmental impact.

Especially in China there were developed new electonically controlled battery storing systems. I think, in these systems we should invest our efforts!

Hello,

Unlike Dr. Rudolf Ritt I would opt for pumped storage. As correctly noted it is a mature technology but this is one of its main strengths. Additionally, pumped storage has a significantly smaller environmental impact than batteries. Every energy storage medium has its purpose in the energy system but on a larger scale only pumped storage and compressed air are as for know available options. One may also consider here also a power to gas concept which is currently discussed in Germany: https://www.euwid-energie.de/bdew-kongress-wie-schnell-brauchen-wir-power-to-gas/

Best,

Hello Prof. Ritt,

Thanks a lot!!!

Hello Prof. Jurasz,

It's great pleasure for your valuable comment.

Big Thanks!!!

I recommend Dr.Jakub Jurasz comment.

Emad

I also consider the pumped hydro storage system as the best massive energy storage that exist today. Because of the immense scale achieved, this is the most common type of grid-level energy storage based on megawatts installed today.

With over 120 GW, pumped hydro storage power plants represent nearly 99 % of world-wide installed electrical storage capacity, which is about 3 % of global generation capacity. Chemical energy storage focuses on hydrogen and synthetic natural gas (SNG) as secondary energy carriers, since these could have a signifi cant impact on the storage of electrical energy in large quantities.

In reference: http://www.iec.ch/whitepaper/pdf/iecWP-energystorage-LR-en.pdf

Figure 2-9 a general overview of Electrical Energy Storage  is given

Hello Emad,

Many Thanks for your recommendation.

Nice Day!

Hello Pedraza, 

Thanks a lot for your good answer.

Good Day!

Hello Glodeanu,

Big thanks for your valuable answer and share.

Nice time!

At present cost levels of energy storage technologies, pumped hydro storage (PHS) and compressed air energy storage (CAES) represent the two options for large-scale energy storage. However, the deployment of additional PHS in electricity system today is decreasing to reduced number of suitable geographical locations and also due to the environmental impacts as mentioned by others. CAES is a promising technology, however, advancement is still required to improve its efficiency.

Hello Osama Aslam Ansari,

Many Thanks for your excellent answer.

So, do you think CAES can replace the role of PHS?

Very Sincerely,

I agree and recommend the answer of Dr. Rudolf Ritt

Hello Isam Issa Omran,

Thanks a lot for your recommendation.

Hello Mutasem Z. Bani-Fwaz,

Thanks a lot!

Yes, of course! PHS+ PV is high interest option.

In my opinion, it is more feasible for Rural Electrification.

In most of the Rural Villages, the villagers do not need the Electricity in their homes due to their agricultural works in the day time. So, they can store Energy to PHS from PV System. Then, at the night time, they operate PHS and use the Electricity from it.

The power-to-gas concept, I can also very much support, although it has a relatively poor efficiency. The advantage is that the storage and the distribution network already exist. Another advantage is that the energy does not just work for hours or days, but even from summer for the winter.

Electonically controlled battery storing systems may not have a smaller environmental impact than pumped storage, like Mr. Jurasz said, but it can be used for two purposes: with a electronically controlled system we can use the batteries in e-cars for energy storage. I heard, that only 360.000 cars could save the whole storage problem in Germany. This can also be in a decentalized matter ( „Local Smart Grids“ ) to avoid big distribution networks.

Look at this:

http://www.sonnenseite.com/de/mobilitaet/das-elektroauto-als-energiespeicher-nutzen.html

Hello Prof Rudolf Ritt,

Thanks a lot for your excellent answer.

Yes, I agree that we need to consider the Environmental Impacts of the Batteries.

Recently different types of CAES have been proposed, such as Adiabatic CAES and Advanced Adiabatic CAES. Theoretically, they have better performance than conventional CAES. However, such technologies are yet to be commercialized.

Power-to-gas is also an interesting option as mentioned by Prof. Ritt. In fact, there have been some demonstration projects which utilizes Hydrogen gas as a storage medium.

Hello Osama Aslam Ansari,

Thank you very much for your answer regarding CAES.

Have a Nice Day!

I agree with the comment of Florian Glodeanu ; however, the hydrogen-based energy storage systems may be a better choice as a future bulk energy carrier, and storage. In comparison with pumped storage, the hydrogen-based storage are more techno-economically flexible, and less environmentally hazardous. For example,

--> The placement of pumped energy storage systems are subjected to more constraints.

--> There is a project-based minimum capacity of pumped storage system for techno-economic design/operation, while hydrogen based system can be built to accept any amount of surplus energy.

--> With pumped energy storage, conventional systems are used for power transmission (which limit the power transfer over very long distances), while pipelines is one of the method to transfer the hydrogen from a location to another.

--> From environmental point of view, large water storage reservoirs can produce and emit some types of GHGs (such as methane), while the environmental impacts of the hydrogen, and hydrogen-based fuels are relatively small.

--> The hydrogen can be imported/exported using gas-like transportation technologies.

Hello Prof. EL-shimy,

Great! I'm deeply appreciated for your excellent answers.

Yes, we've the problems about the transmission lines to transmit the generated power from the massive storage system.

The transmission lines must have the enough capacity to transmit, power losses problem, ans also other AC problems like corona losses, skin effects, power factor and many others.

Thanks a lot!

Sincerely

You are welcome Dr. Aung. In fact, the problem of stressed power transmission networks is dominating throughout the world due to many factors, including: reduced investments in transmission infrastructures, open market caused congestions, the inherent low power flow controlability, and vandalism. Therefore, the power-to-fuel-to-power systems seem very promising alternative to the classical approach of power transmission.

Hello Prof. EL-shimy,

Big Thanks for your Great Answer!

Sincerely

Hi Dr. Aung,

I have analyzed and discussed both pumped hydro and battery energy storage systems as long-term and short-term energy storage systems in my thesis. I think you might find it useful for your research:

Thesis Assessment of Renewable Energy Based Micro-Grids for Small Communities

Dear S.M. Sajed Sadati ,

Many thanks for your sharing.

i think lead acid batteries are good choice