SSE is the first of the "big six" to raise prices this year, but it is thought others might follow suit soon, with British Gas parent Centrica recently warning wholesale price rises may lead to higher bills this autumn.
When one moves others follow, and over the next three months I'd expect to see similar announcements.
More than 8 million customers of SSE face a price hike typically over £100 a year - now all eyes are on the other big energy firms.
Energy bill increases are not just a problem for the millions of consumers who'll have bigger bills landing on the doormat.
Energy firm SSE has announced that electricity and gas prices will rise by an average of 9% from October 15.