Sweden has often very long transport routes for the energy, meaning that it is still a big challenge to supply the big cities, especially in the very south, with stable power, as the long transport routes don't have capacity enough for the increasing demand from an increasingly electrified society (charging electric cars etc).
As other comments are on to, you can't rely on wind for base energy due to the extreme fluctuations in output. It isn't uncommon with a few days of basically no wind at all in the whole country, typically when it is at its coldest, with temperatures sometimes around -30 - -40 C in the north, and perhaps -10 - -20 C in the south. Then you gotta have stable energy, or people's lives might be at risk.
As other comments are on to, you can't rely on wind for base energy due to the extreme fluctuations in output. It isn't uncommon with a few days of basically no wind at all in the whole country, typically when it is at its coldest, with temperatures sometimes around -30 - -40 C in the north, and perhaps -10 - -20 C in the south. Then you gotta have stable energy, or people's lives might be at risk.