More than 3,600 householders have signed up for the first Lincolnshire Energy Switch scheme, which will save them an average of £167 over a year.
Seven authorities across the county, including the City of Lincoln Council, signed up to the first Energy Switch scheme.
The new scheme, which allows residents to switch to the tariff of the lowest bidding supplier, will reach its first deadline for accepting offers on March 31.
So far 351 households have registered in Lincoln, according to the City Council.
Some 77.5% will save more than £50 after signing up. Another 14% will save up to £50.
For those who registered for dual fuel switch and to receive an online bill, the average saving was £197.
In North Kesteven, 606 people registered. More than 300 will save an average of £175 on a monthly direct debit online tariff for dual fuel.
A further 150 dual-fuel monthly direct debit customers who have paper billing are set to save £150 on average.
Karen Lond, lead officer on the Lincolnshire Energy Switch, said: “If all of the Lincolnshire households that registered switch, they could collectively save more than £600,000.
“At a time when many energy companies have increased their prices, this is a welcome opportunity for households to see if they can make savings and put a bit more money back into their pockets.”
Everyone who registered should receive their individual offer by letter or email by March 11.
Those with questions or not receiving a letter should contact their local council or call 0800 0488285 between 8am and 5.30pm, Monday to Friday.
For households that missed the first collective switch, a second opportunity is scheduled to launch soon.