Why there is no default to assume
South Dakota is one of only two states without a statewide net metering requirement. Utilities may offer customer generation arrangements voluntarily, and some do, but nothing obliges them to.
In Nebraska statute guarantees net metering to 25 kW. In North Dakota, to 100 kW. In Kansas the investor-owned utilities must offer it. South Dakota has no equivalent.
So a guide that describes South Dakota net metering terms is describing one utility voluntary policy rather than a state rule, and it may not describe yours.
That is why the document matters. It is not a formality to confirm later; it is the input that determines whether a project makes sense at all.
What to ask the utility to put in writing
Whether it credits exported electricity at all, and if so at what rate and in what units, kilowatt hours or dollars.
Whether generation is netted against consumption across a billing period or measured on a shorter interval, since that determines how much of your production becomes export.
Whether credits carry forward, whether there is any annual reconciliation, when it falls and what happens to remaining credit.
What the interconnection application involves, what it costs, how long approval takes, and whether any charge applies specifically to customer generators.
The part that is certain either way
Electricity your household consumes at the moment it is generated offsets a purchase at the full retail rate, because you simply never buy it. That is true under any arrangement.
So a system sized to your daytime consumption is the most robust design in South Dakota, since its value does not depend on what the utility chooses to do about exports.
That is worth knowing before you have the document, because it tells you which direction to lean if the export answer turns out to be unfavourable.
Ask what self-consumption share the savings model assumed and ask to see the projection built on self-consumption alone, with export value shown separately as an addition.
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 Sioux Falls 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 electricity you consume as it is generated. Everything about exports comes from your own utility voluntary policy.
Get that policy in writing first, then ask for the projection built on it with self-consumption and export shown as separate lines.