Bear in mind that the power purchased from an outside supplier is only affecting the energy portion of your total kWh cost and thus the reduction will be a little less than it looks like from the outside. To figure out your actual total kWh cost you take all the multiplier entries (look for an x) that show up on your billing and add them together.
The total residential cost per kWh (<400 amp service) for the Co-op right now is 21.274 cents per kWh, and the energy charge portion makes up just 13.783 cents of that total. Their rate did just drop by ~3 cents from the winter high, but the fixed monthly membership fee has risen to $33.03.
The Eversource is a little higher at 29.636 cents per kWh but their fixed customer charge (membership fee) is lower at $13.81 per month. The energy portion of an Eversource bill is now 20.221 cents per kWh.
If you can get a favorable energy rate from an outside supplier it likely makes sense for an Eversource customer, but for a Co-op customer it may not be worth a lot of effort.
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