According to the company, electricity consumers in southern Sweden can count on a variable electricity price that is three to four times as high as last winter.
Monthly invoices that last year landed at 5,000 - 10,000 can this winter be at 15,000 - 40,000 kroner, according to the newsletter from Varberg Energi.
Reducing the indoor temperature is highlighted as an effective way to reduce costs.
The newspaper GT was the first to report on the news.