Storage at sea by pumped storage (STEP Maritime) of renewable electricity

[chatelot16]

storage is not the only solution to facilitate the use of photovoltaics and wind power: there is also remote control for consumers

it is necessary to set up an automatic control of everything which does not need to operate at a precise instant, but can also be useful a few hours more trad, heating freezer refrigerator, and a multitude of thing in the factories

for this to exist it is necessary that the customer draws a financial benefit from it, therefore make a variable rate in real time, so that the consumer who installs what it takes to get his devices started at the best time draws savings

alas the new linky counter does not seem planned for that

[Did67]

And in the same way, an incentive price for anaerobic digestion, a naturally easily stored energy source (biomethane).

But as long as there are not two tariffs, one higher for peak hours and the other lower for the rest of the time, no operator will over-invest in a gas generator and two or three groups cascade cogeneration ...

[Remundo]

absolutely, but this topic is getting bushy

[Christophe]

Yes, I'm going to divide from the moment we left for storage ...

[chatelot16]

this displacement of all the responses to jancovici is bizarre, we no longer understand it

this subject is a system of storage at sea, interesting and useless to pollute it by storage in general or reviews of jancovici

I think it would be better to leave all this in the subject jancovici because that is why it was written, and to copy in another subject what concerns the storage, so that the continuation of the reflections on the storage have a place

this principle of storage at sea deserves to be explained more clearly: I was wondering in which hole lower than the sea they were going to pump: or to release sea water ... I read well? especially do not send seawater to a freshwater well

I understand better: it is about polder: area below sea level delimited by dike: large volume is possible ... it also allows to recover energy from the tides ... but if the level of the pelvis is lower than the level of low tide, the tide does not bring energy, it only varies the efficiency of the system

with a low pool and the sea, the useful power at low tide will be low, it will work better at high tide ... we can think of 2 pools, one as low as possible, the other as high as possible ... that either the hour we can pump or turbine at full power from one basin to another, but we can do even better depending on the level of the tide by pumping or turbinating between the sea and the right basin

the Dutch must certainly think about it since they want to abandon certain polder becoming dangerous with the rise in sea level ... it can become huge basin at various levels to store energy

[izentrop]

Three kilometers off the Belgian city of Wenduine, the sea is only 4 meters deep on average. The dyke will be 4 + 10 = 14 meters high ... The Belgian project is an atoll with a radius of 1,25 km ... Surface of 4,9 km2, difference in level of 10 meters, hence storage of 610 MWh, ...

I had applauded without doing the math.

The top of the water reserve must correspond to the level of low tide and in the emptying mode of the reserve, the turbines must always discharge above sea level.

With a maximum tidal range of 5 m (high tides), there can be 12.5 m of vertical drop. We can therefore calculate the energy required to raise this 10 m high body of water.
W = mgh
I found 167 MWh

With an average loss of 30%, it will be necessary to spend 217 MWh, but taking into account the same losses we will recover only 128 MWh.

Are we far from 610 MWh?

[Obamot]

Is this a question?

[izentrop]

I would have liked someone else to do the math because I didn't like it.
Does it bother you that I don't take sources for cooked everything?

[Remundo]

unless I am mistaken,

the cylinder, 1,25 km in radius and 10 m high, contains: 4 m906 of water

before going further, we must confirm that it is the radius, and the correct height.

[izentrop]

Yes, more detail here:

A project to build an artificial island containing a large well 30 m deep and intended for the storage of wind power from the offshore wind field near the North Sea (2 MW of global capacity expected in 300) has been proposed at the beginning of 2020 to the port committee of Zeebrugge, to replace the two nuclear power stations of the Doel nuclear power station and that of Tihange2013. This energy atoll could be located 1 km off the neighboring town of Wenduine. It could measure 3 km in diameter and rise to 2,5 meters above sea level.

https://fr.wikipedia.org/wiki/Wenduine#Environnement

In this case, the calculation is more complicated and I automatically validate the 610 MWh