Energy giant npower will reveal a price cut for millions of customers this week.
The firm will shave around 2.6% off the average bill as it becomes the latest supplier to pass on savings from cuts to green levies.
But the reduction only partly offsets a 10.4% price hike in December.
So although bills are coming down by around £50, the average customer will still be nearly £90 worse off this year.
Scottish Power yesterday confirmed it will knock 3.3% – or £42 – off a typical dual-fuel bill from January 31 to reflect lower green levies announced by Chancellor George Osborne in his autumn statement.
But, like npower, Scottish Power customers are still out of pocket because it jacked up bills by 8.6% on December 6.
Scottish Power boss Neil Clitheroe said: “We will try to avoid any further rises in 2014 but this will depend on increases in wholesale energy prices.”