Would you look at that, turns out a mix of renewables and nuclear is an incredibly good idea.
this post was submitted on 13 Aug 2024
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In 1990 Sweden generated 3TWh of electricity using fossil fuels. That happens to be the same as last year. So they did not get the emissions reduction from that. Instead it comes from having district heating system, which Sweden turned green by using biomass, large heat pumps and other renewable heating system. Also a massive adoption of electric cars and actually changing industrial processes. So they did not change the electricity mix to lower emissions.
By 1990 the electricity mix was already clean. Those 3 TWh are from backup power plants. For context, the electricity production of Sweden in 1990 was 145TWh and 160 last year.
The main transition in the grid was 1970-1990, but that time period isn't on your graph. Ourworldindata unfortunately doesn't have stats for electricity before 1990, but we can instead look at the total energy consumption of the country. Fossil fuels went from representing ~70% of total energy consumption (360TWh) down to a mere 35% (230TWh). This was achieved by the introduction nuclear power (190TWh) and expansion of hydropower (+90TWh) - i.e a mix of Nuclear and Renewables.
huh? fossil fuels make up a hilariously tiny portion of the swedish electricity network, heat-sourced electricity production in general is only 4%, and fossil fuels are a small portion of that.
Electricity generation is not the only place fossil fuels are used and Sweden had a clean grid in 1990 already. Also 4 of Swedish electricity is from fossil fuels. A lot more is from nuclear, which also is heat based.
Point is that Sweden did not cut emissions, by shutting down fossil fuel power plants since 1990. At least that had nearly no impact, as the grid was clean already.
That's true. It is also true that power was generated to support the polish market when half of Sweden's nuclear reactors had to be taken out of production due to some malfunction during a bad cold front in December.
Having said that, electricity is still scarce during winter which means that a lot of it is used for heating. That must end and ideally in a way that let us use the energy excess during summer for heating during winter.
Sweden has a lot of district heating already. Storing heat in form of hot water is rather easy and cheap. Large water tanks have lower outside volume and insulation is rather cheap. So one can produce heat in summer and use it in winter.
Well, Yes and no. Water is a great storage, but it is hard to insulate and very corrosive in the long run. And on the grand scale of things, the amount of water that needs to be heated for city scale applications are hard to deal with. There are cities which has connected huge caves to the district heating system, but the amount of energy stored there is rather insufficient. A case in point, MΓ€larenergi claims that their energy store, the size of about 120 Olympic swimming pools heated to 95 degrees C, would power a city of about 100 000 people for about two weeks in somewhat benign weather conditions.
Winter is longer, though, and we need to find ways of storing more heat for longer to be able to make a real dent in demand. There are other methods though, and even better is that some of them doesn't need any carbon what so ever to be viable. And with the new EU directives (EED and EPBD) the foundations and Incentives has been given to start the race for better (district) heating solutions.
Absolutely! And tests are being performed on how to actually make something that is low carbon and practically useful, like in Fjell, in Drammen in Norway. Unfortunately it's not as easy as finding an aquifer and heat it to boiling point. Here is a link to the Fjell test: https://www.muovitech.com/SE/?page=news&id=649
The figure 80% needs to be nuanced a bit. The reason for such a drastic decrease is that there is a lot of forest land in Sweden. In 1990, the emissions were 71,6 Mt CO2eq, while the absorption was 51,39 Mt CO2eq. In 2023, the emissions were 44,22 Mt CO2eq and the absorption 41,22 Mt CO2eq. The net emissions did indeed decrease >80%, but that was because forests made them low in the first place. If we look the emissions only, they only decreased 40%, which is still a good achievement, especially since the population has grown, but far from 80%. Source, Swedish Environmental Protection Agency
So to a large extent the amazing figure is due to geographic luck. It's not very easy for other countries to copy this solution unless they also are lucky enough to have lots of forests.
It might also be worth noting that if you look at Sweden's consumption based-emissions instead, they are about twice as high as the emissions withing Swedish borders. Ourworldindata publishes consumption-based emissions for all countries, and by that measure Swedish emissions are low by European standards, but many countries have lower emissions and Sweden is by no means an outlier. (Note, numbers don't agree with those from Swedish Environmental Protection Agency, probably due to different methodology.)
This was already posted.