NorthWestern Energy Solar Credits Can Reset to Zero: Check Your Annual Settle-Up Month

A large credit balance can look reassuring when your solar payment is due. For NorthWestern Energy customers in Montana, however, unused net-metering credits do not provide an indefinite reserve. The annual settle-up can remove the remaining balance without paying you for it.

If your sales proposal treats every extra kilowatt-hour as future savings, compare that assumption with your account's actual settle-up month. The issue is whether the household uses the credits while they remain available.

Find the month on your account

Montana Code Annotated section 69-8-603 provides January 1, April 1, July 1 or October 1 as the customer-designated start of the annual period. Remaining unused credits from the previous period go to the supplier without compensation. Both versions displayed in the current codification retain that treatment.

NorthWestern's current billing guidance identifies the same four settle-up months and explains that the remaining bank resets without payment.

NorthWestern's Rule 16 places settlement on the applicable meter-reading day in the selected month and permits only one change of settle-up month. Ask the utility to confirm your current selection and whether that change has already been used. A salesperson's suggestion is not confirmation that the utility changed your account.

A year of production is not a year of usable credits

Consider two hypothetical homes with the same annual solar production. One uses its accumulated credits before settle-up. The other still has a substantial balance when the period closes. Their annual production totals match, but the second household has more output that did not reduce a later bill.

That is why a savings model should show monthly production, monthly electricity needs and the reset. A single annual percentage cannot reveal whether the assumed credit bank survives long enough to be used.

Start with bills immediately before and after your settle-up. Record the bank balance and any adjustment. Then work backward through the year to see when the surplus accumulated. If your household changed its heating, occupancy or vehicle use, note when the change occurred instead of assuming the proposal's usage forecast still fits.

Check what the solar company promised

Find the exact language supporting the savings estimate. Did it promise electricity production, a bill reduction, or a particular combined monthly cost? Those are different measurements. A system could meet a production estimate while the household still pays more than expected because the estimate mishandled unused credits.

If the proposal depicts surplus as cash income, ask for the tariff provision supporting that treatment. If it shows credits rolling forever, request a corrected model with the annual reset included. Keep the original version as well as any revision, with the dates and assumptions visible.

An additional panel purchase deserves the same scrutiny. Ask how much of the added output is expected to reduce bills before the reset. A larger array is not automatically a better financial fit merely because the roof has space.

Keep the utility boundary clear

This discussion concerns NorthWestern's Montana program. Montana-Dakota publishes its own net-metering guidance and tariff, and a cooperative account should be reviewed under its own documents. Do not transfer NorthWestern's enrollment procedures or account settings to another provider.

For a Solar Exit billing review, gather the settle-up bills, proposal and production records. If the disagreement concerns the sales promise or financing terms, include the signed agreement in a document review. A lost credit balance warrants investigation; it does not by itself determine contract remedies.

General consumer information, not legal, tax or electrical advice. No savings or cancellation outcome is guaranteed.