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Well, it would surely be possible to replace gas with nuclear, if not more renewables. Offshore wind is pretty consistent. It's very rare to have a completely calm day around the entire UK coastline. I certainly think there is scope for more generation from renewables. The electricity industry agrees - a vast amount of investment is going in to huge offshore wind projects.
That's not to mention the potential for tidal schemes which would at least benefit their local community.
There are 32 Gas-powered power stations in the UK. A lot are just 1GW or less. More renewable capacity would allow some to be retired.
The lack of inertia for frequency control is an issue with non-synchronous plant (asynchronous, DFIG, fully converted).
You can compensate with batteries and other interesting kit but better / easier to have some heavy synchronous plant with a decent governor droop curve.
Of course there are those asking exactly what bad things really happen if we open the frequency limits a bit - ‘cos it’d be a sight cheaper if we did.
In response to the OP, here is a paper on different turbine-generator-grid interfaces. Good luck.
https://www.researchgate.net/publication/268395758_GENERATOR_TECHNOLOGY_FOR_WIND_TURBINES_TRENDS_IN_APPLICATION_AND_PRODUCTION_IN_CROATIA_Invited_paper#pf5
Well, it would surely be possible to replace gas with nuclear, if not more renewables.
Still need gas for emergencies (nuclear needs an external source of power to start) but yes.
Its a question of space. We have 4 hours or so worth of UK consumption from pump storage IIRC. We have nowhere to build a lot more.
I investigated almost every slate quarry in North Wales for pumped hydron including the Glyn rhonwy one that still seems to be a thing.
Is that Glyn Rhonwy project still going? I first found out about it absolutely ages ago so assumed it had gone nowhere, but I see now it's still not actually gone anywhere but has doubled in size...
Most power stations need electricity to start them. Technically speaking, a bloke with a land Rover at Cruachan Hydro Power station can drive up to the dam, manually open the sluices to start Cruachan turbines, which then feed leccy to other stations to fire up the UK grid. Not sure if other hydro schemes can do that but Cruachan was developed with the connectivity / infrastructure to do so.
Cruachan can but its a one shot affair and needs to feed to Peterhead as there are no other thermal stations in our section of the grid.
Torness needs something in the order of 21MW just to run its gas circulators (on one reactor) never mind its coolant water pumps and myriad safety systems. By comparison a gas station could probably start itself with some suitably sized diesel generators.