this post was submitted on 10 Aug 2023
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[–] TWeaK@lemm.ee 13 points 1 year ago (3 children)

Completely replacing fossil fuels with renewables is possible - and has been achieved - in some regions. Off the top of my head, both Denmark and Scotland have produced an excess of their daily consumption through renewables alone. It isn't hard to imagine that if we built a large enough excess of renewable generation we could account for the times when the wind isn't blowing by importing and exporting between areas where it is.

Nuclear can fill a role in the grid, and is needed long term for a bit of voltage and frequency stability, however a shit ton of renewables can be built and energised quicker than a little bit of nuclear.

If we want to turn off the fossile fuels as quickly and as much as possible, renewables are needed first. Investing in nuclear takes investment away from renewables and delays things. Cancelling renewables in favour of nuclear, like this, with 20 years to build 10 plants, is just ridiculous. How many MW of renewables could they build in 10 years with half that money?

[–] Iceblade02@lemmy.world 6 points 1 year ago (1 children)

Renewables aren't being cancelled. What is being done is creating a target to construct nuclear power, which inherently means that Sweden is no longer aiming for 100% renewables, but instead a target where 100%=renewables+nuclear.

[–] TWeaK@lemm.ee 1 points 1 year ago (1 children)

What's being proposed here is 10 new nuclear plants to help cover 200% of current demand, which is the predicted demand in 20 years' time.

Currently there are 3 plants in Sweden providing 30% of the country's demand. If we assume the new plants are each as big as the current 3 (chances are they'll be bigger), then you're looking at at least 100% of the country's current demand as nuclear power, or more than 50% of the predicted demand in 20 years.

With a conservative estimate, if all existing plants close and each new plant is 20% larger, that's around 4 times the country's current nuclear capacity, to be built over 20 years. 60% of the predicted demand in 20 years. That most definitely is putting nuclear before renewables, and will incur significant expense.

What I'm saying is that more of that money should go towards an excess of renewable capacity now, along with the transmission infrastructure to connect it, which can be built more quickly and cheaper than nuclear such that fossil fuels can be switched off sooner.

Once fossil fuels are completely replaced, then it will make sense to prioritise nuclear development. Right now, nuclear is a medium-long term solution to a short term problem, where fossil fuels end up being the only option in the meantime.

[–] Iceblade02@lemmy.world 1 points 1 year ago

*10 nuclear reactors, not 10 plants. There are currently 6 reactors in operation in Sweden and another 4 were shut down by the previous government.

It's essentially a plan to modernize and renew the Swedish nuclear fleet.

[–] starlinguk@kbin.social 2 points 1 year ago* (last edited 1 year ago) (1 children)

Scotland could provide enough renewable energy for the whole of the UK. The only reason the PM says they need more fossil fuel is that his family entered into a billion pound contract with BP.

[–] TWeaK@lemm.ee 1 points 1 year ago

I think Scotland's total MW capacity is more than the UK's demand, however the actual generated amount hasn't been an excess of the country's demand - not like Denmark, which has produced more than 100% of its capacity as renewables while exporting excess to other countries. However, that probably doesn't account for curtailment - the grid operators can tell larger renewable generators to limit or switch off depending on demand.

When this happens typically the renewable generator still gets paid as if they were generating at capacity.