El Paso's 23% Solar Group-Buy Discount vs. the Expired Federal Tax Credit: A $27,200 System Pays Back in 9 Years, Not 14

Your inbox just got an email from the City of El Paso: sign up for "Switch Together," a group-buying program, and the most recent auction round locked in a 23% discount off standard installer pricing. Sounds great. But you also know the federal solar tax credit that used to knock 30% off your system cost quietly expired on December 31, 2025, under the reconciliation bill (H.R. 1) signed into law last July. So which number actually matters for your roof — the discount you're being offered today, or the credit you lost six months ago?

Let's run it, using real production data for your ZIP code instead of a sales rep's rounding.

The Federal Tax Credit You Used to Get Is Gone — Here's What's Left

Through the end of 2025, Section 25D let homeowners who bought their system with cash or a loan deduct 30% of the total cost from their federal tax bill, no cap. That credit is now off the table for anyone signing a contract in 2026. If you're comparing quotes and an installer is still advertising "30% off with the federal credit," ask them to show you the IRS form — that pitch belongs to last year.

Based on Elovane's analysis of the nrel_atb_system_costs dataset, average installed residential solar pricing in 2026 sits between $3.30 and $3.45 per watt depending on region and equipment tier. For an 8 kW system — a reasonable size for a 2,200–2,600 sq ft El Paso home with moderate usage — that's $27,200 before any discount. Under the old rules, the 30% credit would have saved you $8,160. Under today's rules, that savings line is $0.

How El Paso's Switch Together Program Fills Part of the Gap

This is where the group-buying model matters. According to Solar Power World's coverage, the city's Switch Together program pools residential demand and puts installation contracts out to competitive auction, and its most recent round secured an average discount of 23% off retail installer pricing.

Applied to that same $27,200 system: $27,200 × 0.77 = $20,944, a savings of $6,256. That's not the $8,160 the old ITC delivered, but it recovers roughly 77% of what you would have gotten under the expired credit — without needing a tax appetite large enough to absorb the full credit in one filing year, which was always a hidden catch with 25D anyway.

Scenario	System Cost	Savings vs. Retail	Net Cost
Retail price, pre-2026 (with expired 30% ITC)	$27,200	$8,160	$19,040
Retail price, 2026, no federal credit	$27,200	$0	$27,200
Switch Together group buy, 2026, no federal credit	$27,200	$6,256	$20,944

This is the kind of side-by-side Elovane runs for you automatically — so you're not eyeballing installer quotes against a tax credit that no longer applies to your contract.

The Payback Math for an 8 kW System on an El Paso Roof

El Paso sits in one of the highest-irradiance counties in the continental U.S. Our nrel_solar_irradiance and nrel_county_solar datasets put El Paso County at roughly 5.8 peak sun hours per day, among the top handful of counties nationally. An 8 kW system there, after typical system losses (inverter efficiency, wiring, soiling, temperature derate), produces close to 13,200 kWh per year — well above what the same-sized system would generate in, say, Ohio or western Washington.

On the rate side, our eia_electricity_prices dataset shows El Paso Electric customers paying an average residential rate around $0.131/kWh in early 2026 — notably lower than the national average, which keeps annual dollar savings modest even with strong production. Year-one savings: 13,200 kWh × $0.131 = $1,729.

Now the payback question, run three ways, because utility rates don't sit still for 25 years. Using an escalation model on that $1,729 baseline:

Group-buy system ($20,944 net cost):

• 2% annual rate escalation: payback in roughly 11 years (1.02¹¹ ≈ 1.24)
• 4% annual rate escalation: payback in roughly 10.1 years (1.04¹⁰ ≈ 1.48)
• 6% annual rate escalation: payback in roughly 9.4 years (1.06⁹ ≈ 1.69)

Full retail, no discount, no ITC ($27,200 net cost):

• 2% escalation: roughly 13.8 years
• 4% escalation: roughly 12.5 years
• 6% escalation: roughly 11.4 years

That's a swing of nearly three years on payback based entirely on whether you catch the group-buy auction window — a bigger lever than most homeowners realize, especially now that the federal credit isn't there to compress the timeline for everyone automatically. For a deeper walkthrough of how rate escalation assumptions alone can move your numbers by tens of thousands of dollars over 25 years, see how a 12% utility rate hike reshapes solar payback.

What About State Rebates and SRECs? Texas vs. States That Stack Incentives

Here's the part that trips people up when they read national solar headlines: Texas has no state income tax credit for solar and no active SREC market. Our dsire_incentive_programs dataset, which tracks 171 active programs nationwide, shows Texas incentives concentrated almost entirely in local utility rebates and property tax exemptions rather than the SREC-style production credits you'd find in states like New Jersey or Massachusetts.

That's why the group-buy discount matters so much in El Paso specifically — it's doing the job that a state rebate or SREC market would do elsewhere. Compare that to New Jersey, where the ITC's disappearance is cushioned by an active SREC-II market that pays owners for every megawatt-hour produced, or Massachusetts, where the SREC stack alone has been shown to cut a $28,000 system to a 5-year payback in our analysis of the federal ITC plus Massachusetts SREC stack. Same roof size, same sun exposure category almost — radically different math because of what's stacked on top of the hardware cost. If you want the state-by-state incentive landscape without wading through DSIRE's raw listings yourself, Elovane pulls the applicable programs for your ZIP code directly into the payback model.

If You Don't Own a Roof: Martha's Vineyard's Community Solar Model

Not everyone has a south-facing roof, an HOA that allows panels, or a mortgage that lets them finance $20,000+ upfront. Martha's Vineyard Hospital just finalized a 138 kW rooftop installation at its Edgartown workforce housing development — but the interesting part isn't the array size, it's the allocation framework. Per Canary Media and PV Magazine USA's coverage, the hospital built a model that channels the array's savings directly to low-income, year-round island residents' electric bills, without those residents owning or financing a single panel.

This is community solar in practice: you get a share of a larger system's output credited against your utility bill, typically at a discount to retail rate, with no installation, no roof work, no loan. It won't get you to a 9-year payback because there's no "payback" — there's no capital outlay to recover. But for renters, shaded lots, or anyone who ran their own rooftop numbers and didn't like them, it's worth comparing against a straight rooftop purchase. We break down when community solar actually beats rooftop ownership dollar-for-dollar in our community solar vs. rooftop solar comparison.

New Jersey's Balcony Solar Bill: The $1,500 Option for Renters

New Jersey just became the tenth state to legalize plug-in "balcony solar" — small panel systems, typically 600–800 watts, that plug directly into a standard outlet with no permitting or interconnection application required. The economics here are a completely different scale than rooftop.

An 800W balcony unit with decent southern exposure produces roughly 700 kWh per year. At New Jersey's residential rate — our eia_electricity_prices dataset shows New Jersey running closer to $0.19/kWh, well above El Paso's — that's about $133 in annual savings. Against a typical $1,200–$1,800 hardware cost with no incentive attached (balcony systems generally fall outside ITC and most state rebate structures), simple payback lands around 9–13 years. Small, unglamorous, but it's the only rooftop-adjacent option available to a renter, and it doesn't touch your landlord's roof or your lease terms.

A Quick Reality Check on "Big Solar" Headlines

You may also see stories like Sam Altman-backed Exowatt's push into modular solar-thermal storage for off-grid AI data centers — behind-the-meter systems designed to bypass congested utility interconnection queues entirely. It's a genuinely different capital stack: commercial ITC treatment under Section 48E, accelerated depreciation, project financing terms your household loan officer has never heard of. None of that math transfers to your rooftop decision, and headlines about gigawatt-scale "solar economics" shouldn't move your confidence about a residential quote one way or the other. Keep your comparison anchored to your utility rate, your roof's production potential, and the incentive programs actually available in your ZIP code — not the deal a data center just signed in the desert.

Building Your Own Stack Before You Sign

Before you commit to any quote, confirm three things: whether your installer's price already reflects any active group-buying auction in your city, what your dsire_incentive_programs-listed state and utility rebates actually total (not what a salesperson estimates), and what your specific production number looks like using county-level irradiance data rather than a generic national average. Financing terms matter too — our fred_financial_rates dataset puts average 10-year solar loan rates near 7.8% as of mid-2026, which changes the loan-vs-cash comparison meaningfully; see our full breakdown of loan, lease, and cash purchase differences over 25 years.

You can model all of this for your specific address — your utility's actual rate, your roof's actual orientation and shading, and every incentive program currently active where you live — at Elovane. The federal credit that used to make the math simple is gone. What's left is a patchwork of city programs, utility rebates, and state SREC markets that only apply if you know they exist before you sign.

Sources

• Martha’s Vineyard Hospital launches community-funded housing solar model — PV Magazine USA
• New Jersey legislature unanimously passes plug-in solar bill — PV Magazine USA
• Sam Altman-backed Exowatt targets ‘Frontier Land’ data centers with modular solar thermal storage — PV Magazine USA
• Martha’s Vineyard solar array will cut bills for low-income islanders — Canary Media
• El Paso launches solar group buying program Switch Together — Solar Power World