Commercial Solar in Connecticut: What Businesses Need to Know

Commercial solar in Connecticut works differently from residential solar in ways that directly affect payback period, financing options, and the installation process. If you own or operate a business in Connecticut - whether a retail location, industrial facility, warehouse, nonprofit, or multi-family building - here is what you need to know before requesting proposals.

Commercial vs. Residential Solar: Key Differences

The Commercial Solar Tax Incentive Stack

Commercial solar has a materially better tax incentive structure than residential solar, primarily because of accelerated depreciation. Here is how the stack works for a typical Connecticut commercial installation:

Tax treatment depends on your business structure, tax situation, and the specific year of installation. West Electric recommends working with a CPA who understands energy tax treatment for commercial projects. We provide the required documentation for your tax preparer.

Commercial Solar System Sizing in Connecticut

Commercial systems are sized to the roof or ground area available and the utility's net metering cap, not just to annual consumption. Connecticut allows net metering for commercial customers up to 2 MW (2,000 kW). Most Connecticut commercial rooftops accommodate 50 kW to 500 kW depending on size, shading, and structural capacity.

Commercial Interconnection in Connecticut

Commercial solar interconnection with Eversource or United Illuminating follows a more complex process than residential:

• Systems under 25 kW typically follow a simplified Level 1 process similar to residential (4-8 weeks)
• Systems 25 kW to 250 kW go through a Level 2 review requiring a power flow study (8-16 weeks)
• Systems over 250 kW require a full Level 3 interconnection study (6-18 months)
• Some locations on the distribution grid require equipment upgrades funded partially by the customer

West Electric manages the interconnection application and communicates utility status throughout the process. For larger systems, we recommend starting the interconnection application before finalizing the design to identify any grid upgrade requirements early.

Is Commercial Solar Right for Your Connecticut Business?

Commercial solar makes financial sense when:

• You own the building (or have a long-term lease of 15+ years)
• Your electricity bill is at least $2,000/month (the larger the bill, the faster the payback)
• The roof has sufficient unshaded area facing south, east, or west
• Your business has federal tax liability to absorb the depreciation benefits
• You plan to remain at the location for 10+ years

If you do not have sufficient tax appetite to use the depreciation, a Power Purchase Agreement (PPA) or solar lease from a tax equity investor is often the better path - you get the electricity cost savings without the upfront capital or tax complexity.