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We use your location to provide localized solar offers and incentives.
We serve MA, NH, CT, RI, ME, VT, NJ, PA, and TX
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Use the free estimator for a preliminary layout, or share your preferred response method with the commercial team. Final feasibility still requires site, utility, and engineering review.
Use the property's quote, production, utility-specific energy value, O&M, tax rate and documented Section 48E eligibility.
Commercial solar ROI compares project-specific annual net benefit with net investment. Enter the installed-cost quote, year-one production, utility-specific energy value and O&M. Apply 6% Section 48E unless the project documents the 30% labor-compliant rate, and enter the taxpayer's own effective rate before showing depreciation tax value. The result remains a planning model, not a quote or tax opinion.
Free address-based tool
Screen the actual building roof, parking area, or land for preliminary panel count, DC system size, annual production, and confidence evidence before entering economics here. NuWatt installs in MA, CT, NH, RI, ME, VT, NJ, PA and TX; tool access elsewhere is not an installation offer.
No account required to see your roof result
Use your facility's quote, production model, and utility-specific energy value. The model will not substitute a state average or an invented price.
Quote $/W
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Section 48E (6%)
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Year-one energy value
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Simple payback
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What the result includes
No state-average price, electric rate, production factor, escalation, or tax rate is used. Section 48E values follow the IRS source verified 2026-08-31; the depreciation line uses the current 100% first-year rule for eligible property and your entered tax rate. Review the IRS credit page.
Replace placeholders with a facility-specific model
NuWatt will use your interval data, utility tariff, roof or site geometry, and an engineer-reviewed scope.
National planning · local evidence
Businesses, nonprofits and public entities anywhere in the United States can use this educational worksheet with their own project inputs. It does not determine incentive eligibility, utility service territory or whether NuWatt can install at a particular address.
| Bill input | What to establish | What not to assume |
|---|---|---|
| Utility and supplier | Match the serving company, commercial schedule and supply contract to the facility bill. | A utility-directory match identifies a company—not your applicable price. |
| Energy and delivery | Model the kWh charges affected by generation, including applicable seasons and time periods. | A supply-only or delivery-only figure is not the complete bill. |
| Demand | Recalculate billed peaks with the tariff’s measurement interval, ratchet and power-factor rules. | Annual solar production does not prove a reduction in billed demand. |
| Exports | Value exported production under the applicable credit or purchase agreement. | Do not count exported kWh as both self-consumed savings and export receipts. |
| Fixed and minimum charges | Retain charges that continue after installation. | Bill total divided by kWh is not automatically the value of an avoided kWh. |
Methodology: DOE’s utility-rate evaluation guidance. Tariff applicability and current charges still require the utility’s controlling documents and the customer’s bill.
Utility identity, residential price, commercial tariff and historical average are different records. A recent residential verification does not validate an older commercial value in the same utility record. Match the commercial schedule, official source and effective window before using a number; a recent import date alone proves none of those things.
EIA’s published average retail prices are revenue divided by sales, not individual utility tariffs. They can describe historical context, but this worksheet does not substitute them for your facility’s rate. Read EIA’s distinction.
Your numbers · one shared calculation engine
Keep the EPC cash price, usable electricity value and dated benefits separate. Nothing below is prefilled with a state rate, invented installation price or assumed tax credit. Results stay on this device; this worksheet does not upload your bill or create an inquiry.
Use the contractor's installed cost and the engineered DC system size; do not substitute a statewide price-per-watt average.
Use a site-specific year-one production model and the effective utility-specific value of displaced energy.
Use 6% unless the project supports the 30% rate. Enter the taxpayer's own effective rate before modeling depreciation value.
Confirm O&M, export compensation, demand charges, financing, degradation and interconnection items not included in the simple model.
The arithmetic is transparent, but its usefulness depends on the entered quote, site production, utility-specific energy value, O&M and tax inputs. It is not an engineering report, utility study, tax opinion or financing quote.
Our engineers perform detailed site analysis, shade modeling, and financial modeling for your specific property. Free, no-obligation assessment.