> Because Sweden's clean energy capacity is fixed

By what?

You're treating electricity as a globally-tradable good. It's not.

Perhaps they are mistaking Sweden with Norway (whose nearly 100% hydropower system is constrained)

Most of electricity in Sweden is produced by:

1. Hydropower 40%

2. Nuclear 27%

3. Wind 22%

https://ourworldindata.org/profile/energy/sweden#what-source...

It is.