If a friend in Skåne pays far more for electricity than a friend in Norrland on the very same day, it is not a mistake. Sweden is divided into four electricity zones, and each one has its own price, set anew every hour.
The borders do not follow county lines. They follow the physical bottlenecks in the transmission grid, which is the whole point of them. Your zone is decided by where your meter sits, and it is printed on your bill.
Before 2011, Sweden was a single price area. When exports had to be limited, Svenska kraftnät cut the flow at the border rather than inside the country, which kept Swedish prices even while neighbours went short. Denmark complained to the European Commission, and the outcome was that Sweden agreed to handle its internal congestion the way the rest of Europe does: by splitting the country into zones and letting the price differ between them.
So the zones are not a tax and not a pricing trick. They are a signal. A high price in SE4 tells producers it is worth building generation in the south, and tells the grid operator where new transmission capacity is needed.
Sweden produces most of its electricity in the north. Hydro power dominates, and a great deal of wind has been added. But most electricity is consumed in the south, where most people live and most industry sits.
The lines carrying power from north to south have a limited capacity, described as a series of cuts across the country. When a cut is full, the south cannot import all the cheap northern power it would like. At that moment the two halves of the country stop being one market: the north is left with a surplus and a low price, the south has to cover the rest with something more expensive, and the gap opens up.
Southern Sweden also lost a lot of local generation over the years. Barsebäck closed in 1999 and 2005, and two of the Ringhals reactors closed in 2019 and 2020. Every plant that leaves the south makes SE4 more dependent on power sent from elsewhere, and therefore more exposed whenever the lines are full.
The spot price is decided the day before, on the Nord Pool day-ahead market. Producers submit what they are willing to deliver at what price, buyers submit what they are willing to pay, and for each hour of the coming day the market finds the point where the two curves cross.
The important detail is that everyone is paid the same price, and that price is set by the last plant needed to meet demand. If cheap hydro and wind cover almost everything but a gas plant is required for the final slice, the gas plant sets the price for the whole hour. This is why the price can jump so sharply for what looks like a small change in demand.
The calculation is done separately for each zone, which is why Stockholm and Malmö can show different prices for the exact same hour.
The spot price is only the raw commodity. On top of it come four things:
This is why the bill never falls as fast as the headlines suggest. Roughly half of a normal household bill is grid fee and tax, and neither of those moves when the spot price does.
An hourly contract passes the spot price straight through to you, hour by hour. It rewards anyone who can move heavy consumption, and it exposes you fully when prices spike. A fixed-price contract is an insurance policy: you pay a premium for the certainty, and over a long run you usually pay slightly more for it.
The choice depends less on forecasting and more on temperament and flexibility. If you can run the dishwasher at night, charge a car when it is cheap and accept a bad month now and then, hourly pricing tends to pay off. If a surprise bill would genuinely hurt, the premium buys something real.
Nollan.se shows today's electricity prices per zone, hour by hour, so you can see where the cheap hours actually fall before you plan around them.
Roughly: north of Skellefteå is SE1, from there down to about Dalarna is SE2, the middle of the country including Stockholm and Gothenburg is SE3, and Skåne, Blekinge and southern Småland make up SE4. Your grid company decides which zone your meter belongs to, and it is printed on your electricity bill.
No. The zone follows the physical location of your electricity meter, not your supplier. You can switch supplier freely, and you can switch between a fixed-price and an hourly contract, but the zone itself is fixed by geography.
When wind output is high and demand is low, producers may prefer to pay a little rather than shut a plant down and restart it later. Buyers are then effectively paid to consume. It is unusual, it happens most often on windy nights and weekends, and it is a sign that the system has more power than it can use at that moment.
Demand rises sharply when it gets cold, because a large share of Swedish homes are heated electrically. At the same time solar output is near zero and hydro reservoirs are being managed carefully. More expensive plants are needed to cover the last part of demand, and it is those plants that set the price for everyone.
Only partly. The spot price is one component. On top of it come your supplier markup, the grid fee, energy tax and VAT. The grid fee and tax do not fall when the spot price does, so a halved spot price does not halve the bill.