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Get a Free QuoteModel 25-year cash flows with ITC stacking (30-70%), MACRS depreciation, net metering at full retail rate, and CT tax exemptions. Compare cash purchase, C-PACE, PPA, and lease structures side by side.
Cash IRR Range
20-38%
With ITC + MACRS
Simple Payback
3-5 Years
Cash purchase
CT Electric Rate
$0.221/kWh
Avg commercial
C-PACE Payback
Day 1
$0 upfront, positive CF
A Connecticut C-corp installing a 250 kW commercial solar system ($437,500 at $1.75/W) in 2026 can expect a cash-purchase IRR of 20-38% depending on ITC rate (30-70%) and electricity rate assumptions. With C-PACE financing through the CT Green Bank (zero upfront, 100% financed), cash-on-cash IRR exceeds 50%. Key drivers: 30-70% ITC, 5-year MACRS with 20% bonus (CT conforms to federal), net metering at full retail rate ($0.221/kWh), 6.35% sales tax exemption, and 100% property tax exemption. Simple payback: 3-5 years cash, Day 1 positive cash flow with C-PACE.
Internal Rate of Return (IRR) is the single most important metric for evaluating a commercial solar investment in Connecticut. IRR represents the annualized return on your investment, accounting for the time value of money across the full 25-year project life. Unlike simple payback period, IRR captures the magnitude and timing of all cash flows — from the large Year 1 ITC credit and MACRS deductions to the 25th year of escalating electricity savings.
For Connecticut businesses, commercial solar IRR is driven by five primary factors: (1) the federal ITC at 30-70%, providing a massive Year 1 tax credit, (2) 5-year MACRS depreciation with 20% bonus (CT conforms to federal), creating substantial tax deductions in Years 1-6, (3) net metering at full retail rate ($0.221/kWh average), monetizing every kWh of solar production, (4) CT tax exemptions (6.35% sales tax + 100% property tax), reducing effective cost and eliminating ongoing tax drag, and (5) electricity rate escalation (3-5% historically), compounding savings annually.
A key Connecticut advantage is that CT conforms to federal bonus depreciation, meaning the 20% first-year bonus applies on both federal and state returns. This conformity front-loads tax savings more aggressively than in non-conforming states, improving the IRR by concentrating benefits in the early years when they have the highest present value. Combined with C-PACE financing through the CT Green Bank, Connecticut businesses can achieve some of the highest risk-adjusted returns on commercial solar in the Northeast.
The financing structure fundamentally changes the IRR profile of a Connecticut commercial solar project. Cash purchase offers the highest NPV but requires capital. C-PACE — uniquely strong in CT as the nation's first C-PACE program — provides 100% financing while preserving ITC and MACRS benefits. PPAs and leases eliminate financial risk but sacrifice most upside.
Upfront Cost
100% of system cost
Typical IRR
20-38%
Simple Payback
3-5 years
25-Year NPV
Highest
ITC claimed by: Business
MACRS claimed by: Business
Best for: Well-capitalized businesses with strong tax appetite
Upfront Cost
$0
Typical IRR
25-50%+ (cash-on-cash)
Simple Payback
1-2 years (cash-on-cash)
25-Year NPV
High (leveraged)
ITC claimed by: Business (owner-retained)
MACRS claimed by: Business (owner-retained)
Best for: CT businesses wanting 100% financing while retaining ITC + MACRS
Upfront Cost
$0
Typical IRR
N/A (savings rate)
Simple Payback
Immediate (Day 1 savings)
25-Year NPV
Lowest
ITC claimed by: PPA Provider
MACRS claimed by: PPA Provider
Best for: Nonprofits, tax-exempt entities, cash-constrained businesses
Upfront Cost
$0
Typical IRR
N/A (savings rate)
Simple Payback
Immediate
25-Year NPV
Low
ITC claimed by: Lessor
MACRS claimed by: Lessor
Best for: Businesses wanting predictable costs without ownership
Connecticut was the first state to establish C-PACE, and the CT Green Bank has deployed over $400 million through the program. C-PACE allows 100% project financing via a voluntary property tax assessment with no personal guarantee required. The business retains system ownership and claims the ITC and MACRS — unlike PPAs where the developer claims them. Annual C-PACE payments of ~$38,120 on a $437,500 system are less than the $64,900+ in annual energy savings, creating positive cash flow from Day 1. See our C-PACE guide for full details.
Below is a representative 25-year cash flow model for a 250 kW commercial solar system in Connecticut. This example uses base-case assumptions: 30% ITC, 20% bonus depreciation, $0.221/kWh average rate, 4% annual escalation, and 0.5% annual panel degradation.
System: 250 kW | Cost: $437,500 ($1.75/W) | ITC: $131,250 | Depreciable Basis: $371,875 | Annual Production: 293,750 kWh
| Year | Energy Savings | Tax Benefits | O&M | Net Cash Flow | Cumulative |
|---|---|---|---|---|---|
| Year 1 | $64,919 | $169,404 | ($3,750) | $-206,927 | — |
| Year 2 | $67,178 | $27,132 | ($3,825) | $90,485 | — |
| Year 3 | $69,516 | $16,279 | ($3,902) | $81,893 | — |
| Year 4 | $71,935 | $9,768 | ($3,980) | $77,723 | — |
| Year 5 | $74,438 | $9,768 | ($4,059) | $80,147 | — |
| Year 6 | $77,029 | $4,884 | ($4,140) | $77,772 | — |
| Year 10 | $88,324 | — | ($4,482) | $83,842 | — |
| Year 15 | $104,800 | — | ($4,948) | $99,852 | — |
| Year 20 | $124,349 | — | ($5,463) | $118,886 | — |
| Year 25 | $147,545 | — | ($6,032) | $141,513 | — |
Year 1 Total Benefit
$230,573
ITC + MACRS + Energy - O&M
25-Year Energy Savings
$2,109,859
With 4% annual escalation
Simple Payback
~3.4 Years
Including all incentives
The CT Green Bank C-PACE program transforms commercial solar economics by eliminating the upfront investment while preserving all tax benefits. Here is the same 250 kW system financed entirely through C-PACE at 6% interest over 20 years.
C-PACE Financed
$437,500
Interest Rate
6%
Annual Payment
$38,120
Term
20 Years
The C-PACE scenario shows massive positive cash flow in Year 1 — the ITC credit and MACRS deduction are received without having invested any capital. Even in years 2-20 with C-PACE payments, the annual energy savings typically exceed the annual C-PACE payment by $25,000-$30,000+, providing consistent positive cash flow throughout the financing term. After the C-PACE loan is repaid in Year 20, the system continues producing free electricity for an additional 5-10+ years.
Commercial solar IRR is sensitive to several key assumptions. Understanding which variables have the largest impact helps businesses assess risk and identify the scenarios most relevant to their situation. Below are three scenarios — conservative, base case, and optimistic — with their impact on a 250 kW CT system.
Low escalation, below-average rate
Historical escalation, current average
High escalation, blended all-in rate
For a detailed depreciation schedule and entity-type tax comparison, see our CT MACRS depreciation calculator. For utility-specific rate analysis and demand charge modeling, use the CT commercial rate calculator.
Complete guide to commercial solar in Connecticut: ITC, MACRS, C-PACE, net metering, and utility rates.
Year-by-year MACRS schedule with ITC stacking. CT conforms to federal bonus depreciation.
CT Green Bank C-PACE: 100% financing, 140+ municipalities, 20-25yr terms.
Eversource CT vs UI rate structures, demand charges, net metering credits, and TOU optimization.
A cash-purchased commercial solar system in Connecticut typically achieves an IRR of 20-38%, depending on system size, ITC rate, electricity rate, and demand charge reduction. With C-PACE leveraged financing (zero upfront), the cash-on-cash IRR can exceed 50% because you earn returns on the full system value while investing nothing out of pocket. For comparison, the S&P 500 has historically returned ~10% annually. An IRR above 15% is generally considered excellent for a 25-year infrastructure investment with minimal ongoing risk.
We model 25-year cash flows using your actual utility bills, facility data, and financing preferences — including C-PACE scenarios through the CT Green Bank.