Commercial Solar in Connecticut 2026: ITC, MACRS & C-PACE

Yes. The Section 48/48E commercial Investment Tax Credit (ITC) is available, and there are two timing pathways. Projects that began construction on or before July 4, 2026 locked in the full pathway and can be placed in service through roughly 2030. Projects that begin construction after that date can still qualify, but generally must be placed in service by December 31, 2027. The base rate is 30%, with bonus adders for domestic content (+10%), energy community (+10%), and low-income projects (+10-20%) that can stack up to 50-70%. This is different from the residential 25D credit which expired December 31, 2025. The third-party system owner (developer, financing company, or business if they purchase directly) claims the ITC, not the installer.

The entity that OWNS the solar system claims the Section 48/48E ITC. If a CT business buys the system outright with cash or a loan, they claim the ITC on their federal tax return. If the project uses a PPA, lease, or C-PACE structure where a third-party developer/financing company owns the panels, that third party claims the ITC and passes the benefit to the business through lower rates. The installer never claims the ITC -- only the system owner does. Nonprofits and tax-exempt entities (schools, municipalities) can benefit through PPA/lease structures where the for-profit owner claims the credit.

C-PACE (Commercial Property Assessed Clean Energy) is a financing mechanism administered by the CT Green Bank that allows commercial property owners to finance solar installations with no upfront capital. The loan is repaid through a special assessment on the property tax bill over 20-25 years. C-PACE is non-recourse (attached to the property, not the borrower), transfers to new owners if the property sells, and does not appear on the corporate balance sheet. It covers 100% of project costs including soft costs. C-PACE rates are typically 5-7% fixed.

Connecticut commercial solar uses the Non-Residential Renewable Energy Solutions (NRES) tariff -- a separate program from the residential RRES tariff, so the residential Buy-All rate does not apply to commercial systems. NRES offers two structures: Buy-All (100% of generation is exported and purchased by the utility at a PURA-approved price) and Netting (your building is served first, and excess is netted at your retail rate). There is no single published commercial Buy-All price: for Medium (>200 kW to <1,000 kW) and Large (1,000-5,000 kW) projects the price is competitively bid (as-bid) per tranche under a PURA-approved ceiling, while School Solar pricing is set administratively by PURA each year. The awarded price is locked for the 20-year tariff term. Confirm the current category price caps and open tranche in the active NRES RFP (PY5 decision, PURA Docket 25-08-03, issued December 17, 2025). Combined with the Section 48/48E ITC and MACRS depreciation, NRES creates a strong investment case for CT commercial solar.

Foreign Entity of Concern (FEOC) component-sourcing rules apply to the domestic content bonus: projects using components manufactured by foreign entities of concern (primarily certain Chinese companies) may lose eligibility for the domestic content bonus (+10% ITC adder). July 4, 2026 was the Section 48E timing fork: projects that began construction on or before that date locked in the longer pathway (placed in service through roughly 2030), while projects starting now can still qualify but generally must be placed in service by December 31, 2027. "Begin construction" means either starting physical work of a significant nature OR paying/incurring at least 5% of total project costs (the 5% safe harbor).

MACRS (Modified Accelerated Cost Recovery System) lets businesses depreciate commercial solar over 5 years for tax purposes, even though panels last 25+ years. Under OBBBA (IRC §168(k)), 100% first-year bonus depreciation is permanently restored for property placed in service after January 19, 2025, so a business can deduct the entire depreciable basis in Year 1. The depreciable basis is reduced by half the ITC amount (e.g., with 30% ITC, depreciable basis = 85% of cost). At a 21% corporate rate, that full first-year deduction is a substantial tax savings in the year the system is placed in service.

Yes. Connecticut offers both sales tax exemption (6.35%) and property tax exemption for solar installations on commercial properties. The sales tax exemption applies to all solar equipment at the time of purchase -- on a $400,000 commercial system, that saves $25,400 immediately. The property tax exemption means the solar system adds $0 to your assessed property value. With CT commercial property tax rates averaging 2.0-3.5%, this exemption saves thousands annually over the 25+ year life of the system.

A typical CT commercial solar project takes 6-12 months from initial assessment to operation. The timeline includes: site assessment and engineering (2-4 weeks), financing/C-PACE application (4-8 weeks), permitting and utility interconnection (4-8 weeks), equipment procurement (4-12 weeks), installation (2-8 weeks depending on size), inspection and interconnection (2-4 weeks). 100% MACRS bonus depreciation is available in the year the system is placed in service. The Section 48E begin-construction window closed July 4, 2026; projects that began construction on or before that date locked in the longer pathway, while projects starting now generally must be placed in service by December 31, 2027.