Our Town Energy Alliance is a great co-op group which locks in oil & propane prices, by purchasing energy contracts in advance of the heating season.
They service areas in ME, VT and MA. I believe the cut-off for this season was closed July 30 to receive the discount rate, but you can them out for the future.
Here is their website:
https://ourtownenergyalliance.com/
Also, Our Town Energy has partnered with Utility Choice Savings, is a registered electric load aggregator, to provide alternate electricity supply to members. Their website is:
http://www.otelectricity.com/