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Get a Free QuoteThe commercial Section 48/48E ITC (up to 70%)is active — begin construction on or before July 4, 2026 to safe-harbor the widest timing window. Combined with MACRS 100% first-year bonus depreciation and CT Green Bank C-PACE financing, CT small businesses can go solar with zero upfront cost and 3-5 year payback.
Up to 70%
ITC Available
Section 48/48E — 7/4/2026 safe harbor
100%
MACRS Bonus
First-year depreciation (permanent)
3 – 5 yr
Typical Payback
CT small business systems
Up to 25 yr
C-PACE Terms
Zero down, no personal guarantee
A convergence of deadlines and economics makes 2026 the optimal window for Connecticut small businesses to go solar. Here is why.
The commercial ITC at 30% base (up to 70% with adders) is active. Begin construction on or before July 4, 2026 to safe-harbor the full timing pathway (placed in service through roughly 2030); projects that begin construction after that date still qualify but generally must be placed in service by December 31, 2027. The credit does not vanish on a single date.
Under OBBBA, 100% first-year bonus depreciation is permanent. For a $100,000 system the entire depreciable basis ($85,000 after the ITC reduction) is expensed in Year 1 — a major cash-flow advantage. Businesses may elect out to the standard 5-year MACRS schedule if they prefer to spread the deduction.
Eversource CT charges $0.33/kWh and United Illuminating charges $0.28/kWh — among the highest commercial rates in the United States. Higher rates mean faster payback. Every $0.01/kWh increase in rates adds approximately $350-$500/year in savings for a 50 kW system.
CT Green Bank C-PACE financing covers 100% of project cost, attaches to the property (not the business owner), and requires no personal guarantee. Most C-PACE solar projects are cash flow positive from month one.
Connecticut small businesses can stack multiple federal and state incentives to reduce effective solar costs by 50-70%.
30% base (up to 70%)
The commercial Investment Tax Credit is active. Begin construction on or before July 4, 2026 to safe-harbor the full timing pathway; projects starting after still qualify but generally must be placed in service by December 31, 2027. The third-party system owner claims the ITC. Base 30% + 10% domestic content + 10% energy community + 10-20% low-income adders.
Active — July 4, 2026 safe harbor100% first-year bonus
Commercial solar qualifies for accelerated depreciation. Under OBBBA, 100% first-year bonus depreciation is permanent, so the entire depreciable basis (system cost minus half the ITC) is expensed in Year 1. Businesses may elect out to the standard 5-year MACRS schedule instead.
Active — 100% bonus (permanent)Up to 100% financing
Commercial Property Assessed Clean Energy allows solar financing attached to the property, not the business. Up to 25-year terms, no personal guarantee required. Assessment stays with property if sold.
Active statewideNet metering at avoided cost
Connecticut Residential Renewable Energy Solutions program provides net metering for commercial systems under 100 kW. Credits at retail rate for on-site consumption. Excess generation credited monthly, settled annually.
Active6.35% savings
Connecticut exempts solar energy equipment from the 6.35% state sales tax. This applies to panels, inverters, racking, batteries, and installation labor for commercial systems.
Permanent exemptionVaries by municipality
Many CT towns offer property tax exemptions for commercial solar installations. The exemption prevents the increased property value from solar from increasing property taxes. Check with your local assessor.
Varies by townThe commercial ITC base is 30%. Adders can increase it significantly. The third-party system owner (your business, or a financing company if leased) claims the credit.
| Component | Credit | Requirement |
|---|---|---|
| Base ITC | 30% | System < 1 MW, or meets prevailing wage + apprenticeship |
| Domestic Content Adder | +10% | Steel, iron, manufactured products meet % thresholds. FEOC deadline July 4, 2026. |
| Energy Community Adder | +10% | Project in designated energy community census tract. Several CT towns qualify. |
| Low-Income Adder (Tier 1) | +10% | Located in low-income community or on Indian land |
| Low-Income Adder (Tier 2) | +20% | Part of qualified low-income residential building or economic benefit project |
| Maximum Possible ITC | 70% | All adders combined (Tier 2 replaces Tier 1) |
Why beginning construction on or before July 4, 2026 helps
Beginning construction on or before July 4, 2026 safe-harbors the full §48E timing pathway, giving you years to place the system in service; a later start still qualifies but generally must be placed in service by December 31, 2027. “Beginning construction” requires either starting physical work or spending 5% of total project cost (the 5% safe-harbor test) — for a $100,000 system, roughly a $5,000 deposit or equipment order. Consult your tax advisor for qualification details.
Example: $100,000 system with 30% ITC. Depreciable basis = $100,000 - $15,000 (half of ITC) = $85,000. Under OBBBA, 100% first-year bonus depreciation is permanent, so the full $85,000 is expensed in Year 1. Assumes 25% marginal tax rate. Businesses may elect out to the standard 5-year MACRS schedule.
| Year | Depreciation % | Deduction | Tax Savings (25%) |
|---|---|---|---|
| 1 (2026) | 100% bonus | $85,000 | $21,250 |
| 2-6 | 0% (basis fully expensed) | $0 | $0 |
| Total | $85,000 | $21,250 |
Combined with the $30,000 ITC, total tax benefits = $51,250 on a $100,000 system. Effective cost: $48,750. Consult your CPA for exact calculations based on your tax situation.
Commercial Property Assessed Clean Energy is Connecticut's signature commercial solar financing program. It removes the two biggest barriers: upfront cost and personal risk.
Cash flow positive from month one. ITC and MACRS benefits further improve returns.
Real scenarios for common CT small business types. All numbers use 2026 costs, current CT utility rates, and active incentive programs.
Retail (3,000 sq ft) · 25 kW system
Pre-Tax Cost
$55,000
ITC Savings
$16,500 (30%)
MACRS (Yr 1)
$11,688 (100% bonus, Year 1)
Net Cost
$26,812
Annual Savings
$9,450
Electric Rate
$0.33/kWh (Eversource)
20-Year ROI
$162,188
Rooftop installation. System covers 80% of annual usage. Excess credits bank for winter. Owner-occupied — claims ITC directly.
Service business (5,000 sq ft) · 50 kW system
Pre-Tax Cost
$95,000
ITC Savings
$28,500 (30%)
MACRS (Yr 1)
$20,188 (100% bonus, Year 1)
Net Cost
$46,312
Annual Savings
$14,850
Electric Rate
$0.33/kWh (Eversource)
20-Year ROI
$250,688
Flat roof with ideal south exposure. High daytime usage matches solar production perfectly. Financed through C-PACE — no upfront cost.
Office building (8,000 sq ft) · 80 kW system
Pre-Tax Cost
$144,000
ITC Savings
$43,200 (30%)
MACRS (Yr 1)
$30,600 (100% bonus, Year 1)
Net Cost
$70,200
Annual Savings
$23,800
Electric Rate
$0.28/kWh (United Illuminating)
20-Year ROI
$405,800
Qualifies for energy community adder (+10%) if in designated census tract. System offsets 95% of annual usage. Triple net lease — tenant pays electric, solar reduces NNN charges.
Connecticut provides net metering for commercial systems under 100 kW through the RRES program. Here is how it works for businesses.
Your solar system offsets electricity usage in real time. When production exceeds consumption (weekends, holidays, summer), excess credits roll to the next month. Credits are settled annually — meaning winter shortfalls are covered by summer surplus.
Eversource CT credits excess at approximately $0.33/kWh (full retail). United Illuminating credits at approximately $0.28/kWh. Both rates apply to the supply and delivery charges. The exact credit value depends on your rate class and tariff.
Systems up to 100 kW qualify for standard commercial net metering. Systems between 100-1,000 kW follow the LREC/ZREC or tariff compensation programs, which typically credit at lower-than-retail rates. Most CT small businesses fit comfortably under 100 kW.
Unlike residential accounts, commercial electricity bills include demand charges ($5-$15/kW of peak demand). Solar reduces energy charges but may not significantly reduce demand charges unless paired with battery storage. Evaluate demand charge savings separately.
Yes. The Section 48/48E Investment Tax Credit remains available for commercial solar in 2026. July 4, 2026 is the begin-construction safe harbor, not an expiration: begin construction on or before that date to lock in the full timing pathway, or begin after and still qualify provided the system is generally placed in service by December 31, 2027. The base credit is 30% of the system cost. Adders can increase this to 40% (domestic content), 50% (energy community), or up to 70% (low-income community). Important: the third-party system owner claims the ITC, not the installer. The residential 25D credit expired December 31, 2025, but the commercial credit (Section 48/48E) is a separate provision that remains active.
Small business solar in Connecticut costs $1.80-$2.40 per watt installed for systems under 100 kW. A 25 kW system (typical retail shop) costs $45,000-$60,000 before incentives. A 50 kW system (garage, restaurant) costs $85,000-$110,000. After the 30% ITC and MACRS depreciation, effective cost drops 40-50%. CT sales tax exemption saves an additional 6.35%. Most small business systems pay back in 3-5 years.
C-PACE (Commercial Property Assessed Clean Energy) is a financing mechanism administered by the CT Green Bank. It allows commercial property owners to finance 100% of a solar installation with no upfront cost and no personal guarantee. The financing is attached as a property tax assessment — it stays with the building if sold. Terms up to 25 years. Rates typically 5-7%. Most C-PACE solar projects are cash flow positive from day one because energy savings exceed assessment payments.
MACRS (Modified Accelerated Cost Recovery System) lets businesses depreciate solar equipment on an accelerated schedule. Under OBBBA, 100% first-year bonus depreciation is permanent, so the entire depreciable basis is expensed in Year 1. The depreciable basis is the system cost minus 50% of the ITC. For a $100,000 system with a 30% ITC: depreciable basis is $100,000 - $15,000 = $85,000, and the full $85,000 is deducted in Year 1. At a 25% tax rate, MACRS saves approximately $21,250. (Businesses may elect out to the standard 5-year MACRS schedule if they prefer to spread the deduction.)
Yes. Connecticut provides net metering for commercial solar systems under 100 kW through the RRES program. Credits are applied at the retail electricity rate for on-site consumption offset. Excess generation credits roll over monthly and are settled annually. Systems over 100 kW follow different compensation structures. Both Eversource CT and United Illuminating participate in the program.
With the Section 48/48E ITC at 30%, MACRS 100% first-year bonus depreciation, CT sales tax exemption, and current electricity rates ($0.27-$0.28/kWh), most CT small business solar systems achieve payback in 3-4 years. A 25 kW system saving $9,000+/year with a net cost of roughly $27,000 after incentives pays back in about 3 years. Over 20 years, the same system generates $150,000-$250,000 in cumulative savings depending on electricity rate increases.
Yes, through CT Green Bank C-PACE financing. C-PACE covers 100% of the project cost with no upfront payment and no personal guarantee. Monthly assessment payments are typically lower than the electricity savings, making the project cash flow positive from day one. Power Purchase Agreements (PPAs) and solar leases are also available, where a third-party developer owns the system and sells power to the business at a fixed rate below utility prices.
Full CT commercial solar guide
Read guideCT Green Bank C-PACE details
Read guideMACRS depreciation calculator
Read guideComplete CT incentive stack
Read guideCT utility rate comparison
Read guideBattery + solar for demand charge management
Read guideGet a free commercial solar assessment including ITC calculation, MACRS schedule, and C-PACE eligibility. Beginning construction on or before the July 4, 2026 §48E safe harbor keeps your timing options widest — start the conversation early.