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Three third-party ownership structures, very different end states. Propel is an Energy Services Agreement designed for ownership transfer. Traditional 20-year leases and PPAs are not. Here is the MA-specific comparison — SMART 3.0, ConnectedSolutions, Mass Save, Section 48E, and the parts your installer usually does not show you.
Propel is an Energy Services Agreement (ESA) designed around a structured ownership transfer: a third-party owner holds the system long enough to capture the Section 48E commercial tax credit, then a pre-set buyout transfers ownership to the homeowner. A traditional solar lease is a use-of-equipment contract — you pay a fixed monthly amount for 20 to 25 years and at the end you can buy the system at fair market value, renew, or have it removed. A PPA charges you per kilowatt-hour the system produces with the same 20 to 25 year term. All three structures let the third-party owner capture the 48E ITC, but only Propel is engineered to hand the system to the homeowner once the credit-capture window closes.
All three structures share one thing: the system is not yours during the credit capture window. What differs is the path through that window and what happens at the end.
You pay a fixed dollar amount each month for the right to use the panels on your roof. The lessor owns the equipment, claims the Section 48E ITC, and keeps SMART 3.0 compensation. Term is typically 20 – 25 years with a 1.9 – 2.9% annual escalator. End-of-term: buyout at fair market value (often available at year 7 and beyond), renew, or have the system removed.
You pay a per-kWh rate for every kilowatt-hour the system produces — your bill goes up in sunny months and down in cloudy ones. The PPA provider owns the equipment, claims the 48E ITC, and keeps SMART. Same 20 – 25 year term and 1.9 – 2.9% escalator profile as a lease. The advantage is you only pay for the energy you actually receive; the disadvantage is variable monthly costs.
Propel is an Energy Services Agreement structured around a planned ownership transfer. A third-party owner holds the system for the TPO window (about 5 years) to capture Section 48E, then ownership transfers to you via a pre-set Early Buyout Option already built into your financing. After transfer: no escalator, you own the kWh, and the loan continues on its original schedule with no prepayment penalty.
Sixteen rows of program mechanics, payment structure, and end-of-term outcomes. Specific numbers vary by provider — the structural differences are the part homeowners need to see.
| Feature | Traditional Lease | PPA | Propel ESA |
|---|---|---|---|
| Monthly payment structure | Fixed dollar amount each month | Pay per kWh produced — bill varies with sun | Structured payment with planned ownership transfer |
| Annual payment escalator | Common 1.9% – 2.9% per year | Common 1.9% – 2.9% per year | Designed to avoid post-buyout escalators (provider-specific) |
| Contract term length | 20 – 25 years | 20 – 25 years | TPO window then ownership transfer (structures vary) |
| Section 48E ITC pass-through | Yes — third-party owner captures it | Yes — third-party owner captures it | Yes — captured by TPO, math reflected in payment |
| Who claims SMART 3.0 + AOBC | System owner (the lessor) | System owner (the PPA provider) | Third-party owner during TPO window |
| Who can claim MA $1,000 / 15% income tax credit | Nobody at the homeowner level | Nobody at the homeowner level | Nobody at the homeowner level (MA credit requires direct ownership) |
| End-of-term ownership outcome | Buyout at fair market value, return, or renew | Buyout at FMV, return, or renew | Planned ownership transfer pathway is the design goal |
| Production guarantee / shortfall protection | Often included — varies by provider | PPA pricing inherently tied to production | Performance guarantee during TPO window |
| O&M and monitoring included | Yes — provider responsibility | Yes — provider responsibility | Yes during TPO window; transfers with ownership |
| Roof penetration warranty | Provider-specific (often 10 years) | Provider-specific (often 10 years) | Long-duration warranty per NuWatt installer terms |
| Insurance / liability for the equipment | Lessor carries; homeowner adds rider in policy | PPA provider carries; homeowner adds rider | TPO carries during window; transfers at buyout |
| Transfer / assumability if you sell the home | Buyer credit check + agreement transfer (or pre-pay) | Buyer credit check + agreement transfer (or pre-pay) | Transfer in TPO window; clean handoff after ownership transfer |
| Early termination rights and cost | Typically buyout at scheduled value (year 7+) | Typically buyout at scheduled value (year 6+) | Pre-set Early Buyout Option built into financing |
| ConnectedSolutions battery program compatibility | Yes — owner of battery enrolls | Yes — owner of battery enrolls | Yes — TPO holds program contract on bundled storage |
| Mass Save heat pump / weatherization rebate | Parallel — solar financing does not block utility rebates | Parallel — solar financing does not block utility rebates | Parallel — Mass Save runs through utility, not solar owner |
| Tax-credit pass-through visibility for homeowner | Implicit — typically not itemized in lease | Implicit — typically not itemized in PPA | NuWatt is transparent about how 48E is reflected in pricing |
Specific terms vary by provider. Escalator ranges and term lengths reflect MA-typical structures; pull the exact numbers from each provider’s contract before signing. For a deeper look at cash and loan paths alongside lease and PPA, see our MA cash vs loan vs lease comparison.
The Propel design solves a specific problem: how do you pass Section 48E through to a homeowner without trapping them in a 25-year lease?
Traditional leases and PPAs treat ownership as an afterthought handled at year 7 or year 20 via FMV buyout. Propel bakes the buyout into your loan amortization from day one — the ownership transfer is the plan, not a fallback.
NuWatt is transparent about how the Section 48E commercial credit is reflected in Propel pricing. Traditional leases and PPAs typically embed the same credit value implicitly without itemizing it — the homeowner cannot see the math.
Propel’s MA launch is being structured around real SMART 3.0 base + AOBC mechanics and ConnectedSolutions battery dispatch — not a generic out-of-state TPO template stamped onto Eversource and National Grid territory.
A solar lease is a use-of-equipment contract: you pay for the right to use specific hardware. A PPA is a power-sales contract: you buy the kWh produced by hardware that lives on your roof. An Energy Services Agreementis a service contract that bundles equipment, maintenance, monitoring, and a structured ownership transfer into one package. The legal differences matter for how each contract is treated by your homeowner’s insurance, your lender if you refinance, and the buyer if you sell.
For the federal tax angle on third-party-owned solar in MA, see our Section 48E lease & PPA guide and the Section 48 homeowner guide.
Realistic ranges for an 8 kW MA system, based on Eversource ($0.37/ kWh blended) and National Grid ($0.42/ kWh blended) tariffs as of June 2026 with 2 - 3% utility escalators. Cash and loan numbers reflect the post-25D world: no federal residential credit available.
| Metric | Cash / 15-yr Loan | 20-yr Lease | 20-yr PPA | Propel ESA |
|---|---|---|---|---|
| Year 1 monthly payment (typical 8 kW MA system) | $0 (cash) or $180 – $230 (15-yr loan) | $80 – $130 fixed | $70 – $115 (varies by production) | Set at MA launch — published to waitlist |
| Year 25 cumulative payment | $25,200 (cash) or $33K – $40K (loan, P+I) | $25K – $40K with escalator | $22K – $38K with escalator | Lower than lease/PPA totals based on Maine + Texas analogues |
| End-of-term ownership status | You own the system from day one | FMV buyout, renew, or remove (homeowner choice) | FMV buyout, renew, or remove (homeowner choice) | You own the system after the structured ownership transfer |
| Net 25-year utility-bill offset (MA) | $95K – $125K vs $0.37 – $0.42/kWh tariffs | $25K – $45K net of lease payments | $25K – $45K net of PPA payments | Targets the loan-style net savings band with TPO simplicity |
| Effective price per kWh over 25 years | ~$0.06 – $0.10 / kWh (cash) or ~$0.10 – $0.13 / kWh (loan) | ~$0.13 – $0.18 / kWh after escalation | ~$0.12 – $0.17 / kWh after escalation | MA target: between loan and lease — published at launch |
Footnote. Numbers shown are MA-typical ranges based on Eversource ($0.37 / kWh blended) and National Grid ($0.42/ kWh blended) tariffs as of June 2026 with 2 - 3% utility escalators. Actual quotes depend on roof, shading, system size, utility territory, and provider terms. Pull a personalized comparison from your installer before signing anything. Propel MA pricing is pending launch — waitlisted homeowners get the numbers first.
No single financing structure is right for every MA homeowner. Here is how to think about which third-party path fits your situation.
MA has a denser stack of solar programs than almost any other state. Here is how each one interacts with TPO financing — and where Propel, lease, and PPA are treated identically vs differently.
Under all three structures (Propel, lease, PPA), the third-party owner is the SMART 3.0 participant of record. Base compensation, adders (storage, low-income, community shared), and Alternative On-Bill Credits flow to the owner, who reflects them in pricing. The homeowner does not file SMART paperwork. Propel’s MA launch will publish exact AOBC accounting at rollout.
ConnectedSolutions pays the battery owner per kW dispatched during summer and winter events. For bundled solar-plus-storage projects, the third-party owner holds the program contract during the TPO window under all three financing structures. After Propel ownership transfer, enrollment moves with the equipment — lease and PPA customers stay enrolled through the TPO for the full term.
Mass Save heat pump rebates, weatherization, the HEAT loan, and home energy assessments are delivered by Eversource, National Grid, Unitil, and Cape Light Compact — not by your solar owner. They are evaluated independently of how your solar is financed. Propel, lease, and PPA customers all stack Mass Save envelope upgrades and heat pump rebates without conflict.
Belmont, Concord, Wellesley, Taunton, Braintree, and roughly 40 more municipal light departments do not participate in SMART 3.0. They run their own rebate programs and net-metering structures. TPO economics depend on the local policy — ask your installer for an MLD-specific quote whether you are considering Propel, lease, or PPA.
Massachusetts offers a 15% personal income tax credit on net solar expenditure, capped at $1,000. This credit is only available to homeowners who own the system — that means cash buyers and consumer-loan buyers. Under any third-party ownership structure (Propel, traditional lease, PPA), the homeowner does not claim the MA state credit during the TPO window. The Section 48E pass-through is typically much larger in dollar terms, but it is worth understanding the trade-off explicitly. The federal residential 25D credit expired December 31, 2025, which is the core reason TPO matters more in 2026 — the homeowner-level federal credit is dead, but TPO can still capture §48E.
Every third-party owned solar contract has the same three options at sale: the homebuyer assumes the agreement, the seller pre-pays the contract before closing, or in some cases the seller negotiates a buyout that lets them remove the system. What differs is how clean each option is.
Traditional lease and PPA assumabilitytypically requires the homebuyer to pass a credit check with the lessor or PPA provider, sign a transfer document, and accept the remaining 15 - 20 years of escalating payments. Real estate agents in MA have mixed experiences — clean transfers happen often, but a buyer who balks at the escalator math can derail a deal late in escrow.
Propel ESA assumability during the TPO windowfollows the same credit-check + transfer pattern, but the runway is shorter — only the remainder of the 5-year TPO. After ownership transfer, the system is yours and conveys with the home like any other fixture, no separate transfer needed. That is the cleanest of the three for a future sale.
Pre-payment buyouts (any structure) are sometimes available but priced according to the contract’s buyout schedule. Read the schedule before you sign. For a deeper look at how solar specifically affects MA listing prices and time on market, see our solar & MA home value guide.
The specific questions MA homeowners ask before choosing between Propel, a traditional lease, and a PPA.
No. A traditional solar lease is a use-of-equipment contract — you rent the panels for 20 to 25 years, then return them, renew, or buy at fair market value. Propel is structured as an Energy Services Agreement (ESA) with a planned ownership transfer pathway baked into the financing. The third-party owner holds the system long enough to capture the Section 48E commercial tax credit, then a pre-set buyout transfers ownership to you. The end goal is ownership, not perpetual rental.
The rest of our MA financing and Propel coverage — written for the post-25D, SMART 3.0 reality.
Waitlist, structure, and how Propel compares to cash, loan, and lease.
The other side of the comparison — Propel against a 15-year solar loan.
All four financing paths laid out side-by-side with 25-year math.
How the commercial ITC actually flows through TPO contracts in MA.
Plain-English explanation of the commercial ITC for MA homeowners.
Every program that survived the residential ITC expiring — and how they stack.
What lease, PPA, and ownership structures do to your sale price and time-on-market.
Be the first to see Massachusetts pricing, APR tiers, and SMART 3.0-under-TPO mechanics when Propel launches. No credit pull. No commitment.
Propel is live in Maine and Texas today; the Massachusetts rollout window is April 2026 or later. Final $/W caps, APR tiers, and SMART 3.0 treatment under TPO will be published at launch. Until then, the structural comparison above is what you can rely on — and our cash, loan, and Section 48E lease/PPA paths cover anyone who needs to move sooner. None of this is a substitute for a personalized installer quote.