On a two-family house, the meter decides everything
Two-unit structures are 27.5 percent of Schenectady's housing stock, an unusually high share. On those properties one roof serves two households, and a rooftop array normally connects to a single meter. That means it offsets one household's consumption rather than the building's total.
Work out which account first, because it determines the right system size. If the array feeds the owner's unit, size it against that unit's twelve-month kilowatt hour total. If it feeds a tenant's meter, the tenant gets the benefit and the owner is buying equipment for someone else's bill, which is a legitimate arrangement but a different deal and one worth being explicit about. If there is a common or house meter, that is a third answer again.
Then settle the physical questions with your co-owner in writing: fixings and penetrations, access for maintenance, and who pays when the roof covering is eventually replaced. Roof coverings on two-family houses tend to be replaced as one job, so the array will have to come off and go back on at somebody's expense.
None of this is difficult, and with only one other party involved it is a short conversation. It is simply a conversation that has to happen before a design exists rather than after, because a system sized for the wrong meter is the wrong system.
The two incentives most guidance assumes have ended
NY-Sun's standard-income residential megawatt block for the Upstate region closed on December 17, 2025. Upstate covers installations in the NYSEG, RG&E and National Grid electric service territories, which includes Schenectady. Two weeks later, the 30 percent federal residential tax credit under Section 25D ceased to be available for a purchased home system placed in service after December 31, 2025.
Almost any guidance written before late 2025 therefore describes a project with two supports that a purchase today does not have. Much of that material is still online and still being quoted, usually through staleness rather than dishonesty, but a payback figure including either is wrong now.
The income-qualified route remains open. The Affordable Solar Residential Incentive is still available at 0.80 $ per watt of installed capacity in the Upstate and Con Edison regions for households at or below 80 percent of Area Median Income. That is a substantial amount on a residential system, and eligibility is a defined threshold rather than a judgement, so check where you sit before assuming.
For everyone else, the honest list is net metering credits on your own utility's tariff and the electricity you no longer buy. Ask any installer to show you a payback built from those alone, and treat reluctance as informative.
A solid resource for New York
Plan on roughly 1,225 kilowatt hours a year for every kilowatt installed on a well oriented, unshaded array. That is a good figure by New York standards and better than the western part of the state, so if you have been reading guidance written about Buffalo or Rochester the numbers here are more favourable than that material suggests.
It remains a screening number derived from irradiance data rather than a measurement from Schenectady roofs, so treat it as a ceiling for your address. Orientation erodes it first: a south-facing plane produces the most, east and west planes give up output, and a north plane rarely repays the hardware. On a two-family house the plane available to you may depend on how the property is divided, which is one more reason to settle the ownership questions early.
Shading erodes it most, because it removes production in the middle of the day when the array would otherwise be at its strongest. Ask for an assessment that covers the whole year rather than the hour of the site visit, since a bare tree in April is a full canopy by July.
Snow takes days of production out entirely until it clears, and a steeper plane sheds faster than a shallow one. That changes when production arrives rather than the annual total, but it is worth asking about at the design stage rather than discovering in February.
Reading a quote here
Three questions settle whether a payback figure is current. Does it include the 30 percent federal credit. Does it include a NY-Sun incentive and which one. Can you see the same calculation with both removed. A reputable installer will produce that version without argument.
Ask what net metering terms apply to your specific service too. The Upstate region spans three utility territories with their own arrangements, so a credit figure quoted generically for New York may not describe your bill.
On a two-family property, ask for the model to be built against the consumption of the account the array will actually feed, rather than against the building's combined usage or the roof's capacity. Those three numbers are often very different and only one of them determines what the system is worth.
If you take a lease or a power purchase agreement rather than buying, the provider may claim the business version of the credit under Section 48E and reflect part of that value in the rate they offer you. What they claim and what actually reaches you are separate questions, so put both to the provider and confirm with a tax advisor rather than with the sales material.