Comment Re: I guess they didn't get the memo... (Score 4, Interesting) 79
The UK is part of the European Grid already. There is a 1000MW pair of interconnectors between the UK and Ireland about 3000MW interconnector between France and the UK. The direction of flow depends on the price and the amount of Wind makes quite a big difference.
I don't know how the figures for the UK (their Electricity demands are at least 10x that of Ireland) but i can tell you that the maximum amount of renewable energy allowed on the grid is around 75%
The daily cycle for Ireland runs between 3000MW off peak to 6000MW at peak. The current record for wind generation in Ireland is about 4,500 MW.
So that 4,500 figure would have been produced around the time of Peak demand (about 75%) Perhaps more interesting is when there is high Wind and low demand. When demand is low about 3000MW there is at least 4,500 MW of potential Wind generation available. it depends on weather and time of year. It can be as low as 100MW. more typical would be above 1000MW.
Anyway lets take a scenario where its the middle of the night demand is around 3000MW and there is an excess of Wind in Ireland . As you need grid stability you are limited to around 75% wind so around 2250MW but you have the interconnectors which can take around 1000MW so if the price is right which it usually is with wind Ireland would be exporting so now the demand is 4000MW and now you can use 3000 MW of wind and 1000MW of that goes to the UK. If there is less wind available than upto a 1000MW flows into Ireland. So you could have a situation where 60 percent of generation is from Irish Wind farms and most of the rest is via the inter connectors between UK and Ireland.
It's also worth bearing in mind that fuel for conventional generation is mostly imported so using Wind when its available is a good thing. Ireland also has battery sites as well which can dump a lot of Electricity onto the grid in a fraction of a second and then maintain that output if needed for 2 or 3 hours, This covers the period needed to bring up more conventional generation.
The future is quite interesting, there is already ongoing construction of an interconnector between Ireland and Spain (which is a great location for Solar) There are a couple of interesting projects for storage.
In Berlin at one generating station they are building a large water tank which is mainly for district heating but is going to hold water at up to 90 degrees C (about 200 MW) it's intended that excess Wind generation will be used to generate the heat. However conventional generation needs to raise steam to run and if the water is at 90 degrees to start with rather than say 10 degrees. You don't need to burn so much fuel. The article I read said they can keep it hot for around 13 hours. Which would help shift wind generated power generated off peak to on peak. The German site looks to be ready for September just a few months really for the construction.
There is also another project I read about where the idea was to heat sand to 500 degrees C. Electric Cars are going to need charging and the time to do so is overnight when demand is low. We already have plenty of capacity since we have to be able to generate enough for peak times.
At the very least realise that national grids do not work in isolation and Electricity can be supplied where its needed. You still need infrastructure in place, and some of it needs to be beefed up to carry higher capacity loads. Even Brexit hasn't changed things much if it all about Electricity generation. In Ireland we have 2 countries but one grid sometimes control is in Dublin and at others it's in Belfast.
Electricity is Electricity, how it's generated is not a simple black and white issue.