Can my fuel vendor refuse me service during the winter?

The only utility in our area regulated by the Public Service Commission is NorthWestern Energy. Unregulated electric co-ops and deliverable fuel providers can disconnect or refuse service based on lack of payment at any time.

During the winter moratorium (roughly November through March each year), NorthWestern Energy must apply to the PSC for approval in order to disconnect for non-payment. They then must follow a strict policy of notifications and warning.  Winter_Moratorium_Explained.pdf

They can and do disconnect for non-payment year-round.  It is a common myth that your power cannot be shut-off throughout the winter months.