Comment on The momentum of the solar energy transition
Eheran@lemmy.world 1 year ago- You still need the massive excess capacity then. Costs x2 or x3 are a big change. Without seasonal storage you need a global grid as well as that massive excess capacity. That not only costs extremely much (this was the argument against nuclear) but would also be impossible given the unstable relations around the world, let alone terrorists who only need to cut “one line” to remove power from all of Europe. Not going to happen.
Hydrostorage is absolutely nothing and can not be significantly increased, just like hydro power. Take a calculator and see how long it lasts. World wide it’s 180 GW of power and 1.6 TWh energy, as per wiki. The USA need over 4000 TWh yearly, they empty the whole world capacity of hydro storage from 100 to 0% in 3 hours. Just the USA alone.
MrMakabar@slrpnk.net 1 year ago
That was exactly my point, you do not need a global grid for this to work a continent sized one already does a great job. That was why I used the EU as an example. As for seasonal storage the worst month last year had 42.8% renewables, which was March, the best was February so a month earlier with 60.0%. The average was 49.7%. So we are talking 20% up or down. That is also true when you just look at wind and solar. Average was 47.15GWh and the worst month was 40.97GWh and the best 59.00GWh. So again fairly even distribution over the entire year. So no need for seasonal storage, unless you have something super cheap.
That is real world data and not some crazy stuff. You basicly just have to overbuilt by 50% and add a days worth of storage to the EU grid to work and the ability to move around electricity.
Also I am talking about hydro power, which per wiki only makes up 16% of global generation. That has storage capabilities built in current reservoir power plants. en.wikipedia.org/wiki/Hydroelectricity#Properties
Eheran@lemmy.world 1 year ago
You need enough storage to get over a Dunkelflaute . How much is that for Europe? How much do we have now?
MrMakabar@slrpnk.net 1 year ago
Right now Sweden and Norway have 118GWh of hydro storage and there is more in other EU countries. That alone is enough to power the EU for two weeks or so. But even that is not entirly needed as Europe is large and diverse enough geographically to have different weather in different countries. So power can still be moved. Even on the worst day of last year wind and solar were still able to produce 8.5% of the EUs electricity production so 37% of average levels.
Eheran@lemmy.world 1 year ago
At 2800 TWh of annual electricity demand/production in Europe, 118 GWh lasts for about 22 minutes. 2 weeks would take 1000x the storage capacity, about 100 TWh.