Gocompare.com comments on EDF energy's new extended fixed time period tariffs.
The Blue +Price Promise March 2015 fixes rates for around 18 months. There are no early termination fees and EDF promise to inform customers if any other suppliers offer a tariff that is more than £1 a week cheaper.
The Blue +Price Freeeeze March 2017 fixes prices for nearly four years and again there are no penalty fees if you want to leave the tariff early. But this rate does not have the £1 promise.
The launch of the two new tariffs comes just a week after Ed Miliband announced Labour would freeze energy prices if elected.
Gocompare.com's energy expert Jeremy Cryer said: "This is great news for anyone who is looking for long term certainty. But, fixing energy bills can be a gamble for consumers. It's fine when the market is volatile and prices are going up and down, but not such a good idea when prices are stable, as you pay a premium to fix.
"As a rule of thumb, it's best to fix when good deals and tariffs start disappearing from the market. So it's worth keeping an eye on the financial press to keep up to date with any changes in the energy market."
Jeremy added: "EDF's £1 promise is an interesting move and will certainly shake up the market. It remains to be seen how the other energy companies will react and what deals are offered in the coming weeks - but the additional competition can only be good news for consumers."
95% of customers saved with Gocompare.com when switching their gas and electricity supplier.*
Notes to editors:
*Based on customers who switched energy supplier for both gas and electricity (dual fuel) using the Energylinx powered Gocompare.com platforms during the 1st April - 30th June 2013.