The one part that does not depend on a policy
When your panels produce electricity your household is using at that moment, you simply do not buy that electricity. No credit is issued, no rate applies and no policy governs it.
That value is therefore identical whether your utility credits exports generously, poorly or not at all. It is the floor beneath any South Dakota solar project.
Everything above that floor, meaning every kilowatt hour your household does not use as it is produced, depends entirely on your utility voluntary arrangement.
So in a state without a statutory guarantee, weighting the design toward self-consumption is not just optimisation. It is risk management.
Sizing for the certain part
Ask for your consumption profile through a typical day rather than your annual total, and ask what share of generation the design expects you to use directly.
A system matched to your daytime baseline captures the certain value. A larger one is a bet on the export arrangement, which in South Dakota is a bet on a voluntary policy.
Ask for a smaller system modelled alongside the proposal, with the savings shown as self-consumption alone and then with export value added separately.
That presentation makes the risk visible. If most of the projected savings sits in the export line, you are relying on something that no statute protects.
And shifting load into the certain window
Every flexible load moved into daylight increases the certain portion of your savings at no cost. Dishwasher, washing machine, dryer and any pool pump all qualify.
Charging an electric vehicle during the day rather than overnight is the largest single shift for a household that has one, and in a state with no export guarantee it is worth more than usual.
A battery does the same automatically and at larger scale, converting uncertain export value into certain self-consumption value.
That reframes storage here. In most states a battery is an economic optimisation; in South Dakota it also removes dependence on a policy nobody has promised to keep.
What the arithmetic rests on here
The 30 percent federal Residential Clean Energy Credit under Section 25D expired for property placed in service after December 31, 2025, so a cash or loan purchase in Aberdeen receives no federal tax credit, and South Dakota has no state solar tax credit.
Section 48E survives at 30 percent for third-party owners under leases and power purchase agreements, so ask what a provider claims and what reaches you in the rate.
What exists with certainty is the retail value of self-consumed generation. Export value comes from your utility voluntary policy and should be shown separately.
Ask for the projection built on self-consumption alone first, with export value added as a second line, so you can see how much of the case is protected.