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Searching for Propel, you'll see several company names — SolSource, TriBeam, Concert Finance, Greentech, Medallion Bank. They aren't competing products. They're the companies behind one third-party-ownership solar program. Here's who does what, and the two ways to prepay it.
Quick Answer
SolSource Propel and 'Concert Propel' are the same program, not two competing products. SolSource Solutions (a TriBeam company) owns the third-party-owned system and provides the performance guaranty; TriBeam's Concert Finance program originates the fixed-payment financing (loans by Medallion Bank, Member FDIC); Greentech Renewables distributes it; NuWatt installs it. The hardware is Enphase microinverters and battery with FEOC-compliant Silfab panels. You prepay either with a Concert loan or with cash — two paths, one Propel program that captures the Section 48E tax credit.
If you research “Propel solar” in 2026, you run into a wall of company names and it looks like there might be two rival products. There aren't. There is one Propel program, and each company you see handles a different part of it. The only real choice you make is how you prepay: with a Concert loan or with cash.
Each name you see is one company doing one job. Read this like an org chart, not a shopping list of competitors.
System owner (a TriBeam company)
Owns the third-party-owned solar system, provides the performance guaranty and maintenance, and monetizes the Section 48E tax credit to reduce your agreement amount.
Parent + financing origination
SolSource’s parent. Originates the fixed-payment financing through its Concert Finance program.
The financing program
The financing brand you see on loan paperwork. Sets the fixed monthly payment with no escalators and no dealer fees.
Lender (Member FDIC)
The FDIC-member bank that originates the 25-year loan on the Concert-loan prepay path.
Distribution
Distributes the Propel program to installer partners across the country.
Hardware platform (exclusive)
The exclusive provider of the microinverters and battery, plus system design and support. Paired with FEOC-compliant Silfab panels.
Your installer
Designs, permits, and installs your system as a Propel partner installer in Maine and Texas today.
Propel is a prepaid third-party-ownership product. You prepay the energy agreement one of two ways. Everything else — the owner, the hardware, the tax-credit pass-through, the performance guaranty — is identical.
You prepay the agreement with a fixed-payment, 25-year Concert loan (originated by Medallion Bank, Member FDIC). $0 down, no escalators, no dealer fees.
The loan is packaged to pre-fund the Early Buyout Option, so ownership is designed to transfer to you at year 5, subject to the agreement terms — no separate balloon payment.
Best if you want a predictable monthly payment and the year-5 transfer built into your financing.
You prepay the energy agreement upfront in cash. No loan, no monthly financing payment.
You hold an option to obtain ownership beginning after year five, subject to the agreement terms, choosing when to exercise it rather than having it packaged into a loan.
Best if you can prepay in cash and prefer to decide on the buyout after year five.
Same program either way
Whichever path you choose, SolSource owns the system and provides the performance guaranty (85% or more of estimated kWh) and maintenance, Enphase supplies the hardware, and the Section 48E tax credit is captured by the owner and used to reduce your agreement amount. The prepay method is the only thing that changes.
A common point of confusion is whether Propel is an “Enphase program” or a “Silfab program.” It is one hardware platform that uses both.
Enphase is the exclusive provider of the microinverters and the battery for Propel, plus system design and premium support. That gives you panel-level optimization, no single point of failure, and one monitoring app for the whole power-electronics stack.
NuWatt pairs the Enphase platform with FEOC-compliant Silfab panels manufactured in the United States. Domestic-content compliance is what keeps the project eligible for the Section 48E domestic-content adder, on top of the 30% base credit. Enphase and Silfab are complementary parts of the same specification — not two rival programs.
Two different things are worth separating: where the Propel program is publicly live, and where NuWatt currently offers it.
Per SolSource, Propel is publicly live in Arizona, Texas, Maine, most of California, Pennsylvania, and Colorado, and is expanding across the country where third-party ownership is permitted.
Availability is set by SolSource and its distributor, not by any single installer.
NuWatt installs Propel for homeowners in Maine and Texas today, with waitlists open in Massachusetts, New Hampshire, Rhode Island, Connecticut, New Jersey, Vermont, and Pennsylvania.
Join a waitlist and we will notify you when Propel opens in your state.
Since it is one program, the decision is not “which Propel” — it is how you want to prepay it.
Yes. Despite the different names, there is one Propel program. SolSource Solutions — a TriBeam company — owns the third-party-owned solar system and provides the performance guaranty and maintenance. TriBeam originates the financing through its Concert Finance program, with loans made by Medallion Bank. Greentech Renewables distributes the program to installers, and NuWatt installs it. "SolSource Propel" and "Concert Propel" are two names for the same product, seen from different points in that chain.
Because several companies each handle one part of the same program. You may see SolSource (the system owner), TriBeam (its parent), Concert Finance (the financing program on your loan paperwork), Medallion Bank (the FDIC-member lender), Greentech Renewables (distribution), and Enphase (the hardware platform). They are not competing products — they are the entities behind a single third-party-ownership solar program that NuWatt installs.
They are two ways to prepay the same energy agreement, not two products. On the Concert loan path, you prepay with a fixed-payment 25-year loan that is packaged to pre-fund the Early Buyout Option, so ownership is designed to transfer to you at year 5, subject to the agreement terms. On the cash-prepay path, you prepay upfront and have an option to obtain ownership beginning after year five, subject to the terms. Both are $0-down or prepaid, no-escalator, no-dealer-fee versions of the same Propel program.
Enphase is the exclusive provider of the microinverters and battery for Propel, along with system design and support. The panels NuWatt pairs with the Enphase platform are FEOC-compliant Silfab modules made in the United States, consistent with the domestic-content requirements the program uses. There is no separate "Silfab program" and "Enphase program" — it is one hardware platform.
Yes. Because SolSource owns the system, it claims the Section 48E commercial Investment Tax Credit — a base credit of 30%, with potential domestic-content and energy-community adders of up to 10% each — and monetizes it to reduce your agreement amount. That is how Propel still delivers tax-credit value after the residential Section 25D credit expired on December 31, 2025. You do not file anything; the benefit is built into your fixed payment.
The Propel program is publicly live in Arizona, Texas, Maine, most of California, Pennsylvania, and Colorado, and SolSource has said it is expanding across the country. NuWatt currently offers Propel to homeowners in Maine and Texas, with waitlists open in Massachusetts, New Hampshire, Rhode Island, Connecticut, New Jersey, Vermont, and Pennsylvania. If you are on a NuWatt waitlist, we will notify you when the program opens in your state.
SolSource is the system owner during the third-party-ownership period and provides the performance guaranty — production guaranteed at 85% or more of estimated kWh — plus operations and maintenance. NuWatt is your installer, not the guarantor. Ownership is an option that begins after year five (or is designed to transfer at year 5 on the pre-funded loan path), subject to the agreement terms — never an automatic outcome promised on day one.
NuWatt is a Propel partner installer in Maine and Texas. Check your eligibility with a soft credit pull — no impact on your score.
Propel financing provided by Concert Finance. Loans originated by Medallion Bank, Member FDIC. Systems owned and guaranteed by SolSource during the third-party-ownership period.
Propel Solar Main Page
Qualifier tool, requirements, and program overview.
Propel Financing Review
Independent review of Propel with pros, cons, and rating.
Solar TPO Financing Guide
How third-party ownership solar works in 2026.
How Propel Solar Works
Step-by-step guide to the Propel process.
Concert Finance Solar Review
A closer look at the Concert Finance financing program.
Prepaid Solar Lease Guide
What a prepaid energy agreement is and how it works.
Elena helps homeowners plan whole-home electrification projects — solar, heat pumps, batteries, and EV charging. She focuses on financing strategies and long-term energy savings.