Every funding source, one project, no double dipping.

Stack answers the question that now shadows every rebate project drawing on more than one pot of money: what can this project actually combine, and where is the line. The administrator defines each source as it really is (a flat rebate, a percent with a cap), the exclusion rules between programs, and any per-project ceiling. Stack evaluates every allowed combination and returns the best one, with each clipped amount and each exclusion explained rather than implied. Every rule is the administrator's own; WattShed ships no incentive database.

Run a stacking check

What it does.

Evaluates every allowed combination of the defined sources and returns the one worth the most to the project.
Applies caps deterministically and shows what clipped each amount: a source cap, the project cap, or project cost itself.
Explains every exclusion in plain language, naming the rule that fired.
Flags combinations worth a second look, like two federal sources stacking on one project.
Runs in the browser on rules you enter. No incentive database, nothing stored.

Who it is for.

Utilities and public program administrators

Codify the stacking rules once and answer every project the same way, before a duplicate claim reaches an auditor.

Funders co-funding with public programs

See how a private rebate interacts with the public incentives a household can already claim.

Contractors quoting projects

Quote what a project can actually combine instead of promising incentives that exclude each other.

How it works.

Define the sources

Each funding source as it really is: flat or percent, caps, and the exclusions between programs.

Enter the project

One eligible project cost. Stack evaluates every allowed combination of the sources you defined.

Read the result

The best allowed combination, what was clipped and by which rule, and what was excluded and why.

What it does, and what it deliberately does not.

Stack does	Stack does not
Computes the best allowed combination under rules the administrator sets	Does not supply an incentive database or program rules of its own
Explains every clip and exclusion by its rule	Does not give program guidance or tax advice

Stack does

Computes the best allowed combination under rules the administrator sets

Stack does not

Does not supply an incentive database or program rules of its own

Stack does

Explains every clip and exclusion by its rule

Stack does not

Does not give program guidance or tax advice

Availability.

The stacking check is live today as a public self-serve tool, no account required, nothing stored. Enforcing stacking rules inside a live program's intake and payment flow is arranged with WattShed directly.

Run a stacking check Talk to WattShed

The rest of WattShed Design and Pricing

01 / DesignDesignerDesign and price a rebate program before a dollar moves.02 / PriceEngineThe methodology engine behind every WattShed figure.04 / PriceShiftWhich rate plan actually costs less, on your usage.05 / PriceEffectiveWhat the financing really costs, against the cash price.06 / PriceBlendWho gets what, when the building and the bills belong to different people.07 / PriceItemizeA quote the homeowner can actually read.08 / PriceTallyThree offers on the table. One honest way to line them up.

The other suites

02 / WattShed ApplicationsOne application surface that enforces the program's rules and loses no one on the way in.03 / WattShed Field AssessmentEverything a field visit needs to know about one home, in the order the visit needs it.04 / WattShed VerificationCheck the evidence before anyone is paid, and send what the checks cannot settle to a person.05 / WattShed OperationsRun a live program: budget, contractors, job costs, payments, and the systems you already use.06 / WattShed ReportingTurn program data into a number a regulator, a board, or a utility partner can trust.