The Colorado Commercial Solar Cheat Sheet

A home bill is mostly kWh. A business bill has two engines: energy charges for the kWh you use, and a demand charge for the highest power you pulled in any 15-minute interval that month, billed per kW. On many Colorado commercial rates the demand charge is a third to a half of the bill. Solar reduces energy charges; it barely touches demand, because your peak can happen at 6 pm or on a cloudy day. That single fact decides whether solar, a battery, or both belong in your design.

Energy charge

Per kWh; what solar offsets

Demand charge

Per kW of your monthly 15-minute peak; typically $10–$25/kW on Colorado commercial rates (check your tariff)

Time-of-use

Many commercial rates price afternoon and evening kWh higher; solar and storage both help

Interval data

Your utility can export 15-minute usage; it is the only way to size a battery honestly

Commercial export rules follow the same utility lines as residential, with two differences: system-size caps are usually tied to your usage (typically 120–200% of the past 12 months), and larger systems trigger an interconnection study and sometimes upgrade costs. Under Colorado's net-metering statute, investor-owned utilities net-meter commercial systems; municipal utilities and co-ops set their own terms.

Unlike the homeowner credit, the federal commercial investment credit (Section 48E) did not end. It has deadlines and conditions instead. Combined with depreciation, it still covers a large share of a commercial system's cost for a profitable business.

A battery earns on a commercial bill by cutting the monthly peak. If your peak is 120 kW and a battery reliably holds it to 90 kW, you save 30 kW × the demand rate, every month, whether or not the sun shines. At $18/kW that is about $6,500 a year from demand alone. It only works if the battery has enough energy to ride through the whole peak event, which is why interval data matters.

• Peak-shaving needs a controller that predicts and clips peaks; backup-only batteries do not do this by default.
• Batteries qualify for the federal credit on their own.
• Restaurants, grocery, cold storage and any operation with a compressor load benefit most; warehouses with flat loads benefit least.
• Batteries also cover outages for coolers, servers and life-safety loads; size that separately from peak-shaving.

Commercial pricing per watt is usually a little below residential because the systems are bigger and the roofs are simpler, but every site is a quote: roof structure, electrical service, interconnection and the utility's rules move the number. Payback for a taxable business that uses the credit and depreciation commonly lands in the 5–9-year range; nonprofits using elective pay see similar economics.

Compare quotes by

Price per watt before incentives, and a modeled year-1 savings that separates energy from demand

Typical sizing

Solar sized to the daytime load and the utility's export cap, not to the roof

Ownership options

Own (credit + depreciation), lease, or PPA (pay per kWh; the provider owns and claims the credit)

Roof types

Flat: ballasted racks, no penetrations; standing-seam metal: clamp mounts; carports where roofs are crowded

Rate growth we model

2–4% per year (a scenario range, not a forecast)

Plan on 3–6 months from signed proposal to a running system for a typical commercial roof, longer where an interconnection study is required.

• Flat roofs: ballasted racking adds weight without penetrations; a structural engineer confirms capacity. Membrane age matters: if the roof is due within 10 years, re-roof first.
• Standing-seam metal: clamp mounts with no penetrations are the cleanest commercial install in Colorado.
• Carports: shade inventory or parking, add capacity when roofs are crowded with HVAC, and blunt some hail.
• Hail: commercial panels carry the same certifications as residential; document the panel's hail rating for your insurer.
• Snow: ballasted arrays on flat roofs are tilted 5–10°; production estimates already include snow days.

• Level 2 chargers for employees, tenants and customers add modest load; DC fast chargers add demand spikes that can raise your demand charge more than the energy they sell.
• Pair chargers with load management so several vehicles share a circuit without tripping demand.
• Fleets that return overnight are the easiest case: charge off-peak and size solar to the daytime building load.
• The federal home-charger credit (30C) ended for chargers placed in service after June 30, 2026; commercial charger incentives vary by utility.

• Savings modeled from monthly kWh only, with no interval data and no demand line.
• A system sized to fill the roof rather than the bill or the utility's cap.
• The credit assumed without checking the construction or placed-in-service deadlines, or elective pay assumed for a taxable business.
• No structural letter for a ballasted flat-roof array.
• Interconnection costs ‘to be determined’ with no study and no allowance.
• A PPA rate escalator above 2–3% per year, or a PPA on a building you may sell.
• Production estimates above about 1,600 kWh per kW per year.

Demand charge

Per-kW fee on your highest 15-minute average power draw in the billing month

Peak shaving

Using a battery or controls to cap that monthly peak

Interval data

Usage recorded every 15 minutes; the basis for any honest commercial model

48E

The federal clean-electricity investment credit for businesses; deadlines apply

Elective pay

Tax-exempt organizations receiving the credit's value as a direct payment

MACRS / bonus depreciation

Tax depreciation of the system, often worth as much as the credit

PPA

Power purchase agreement: a provider owns the system and sells you the power per kWh

Interconnection study

The utility's engineering review for larger systems, with any upgrade costs

Ballasted racking

Weighted flat-roof mounts that avoid roof penetrations

Three-phase

The electrical service most commercial buildings have; affects inverter choice

• Request 12 months of interval data from your utility (or authorize us to pull it).
• Send us the last 12 bills and the roof age; we model solar, storage, both, or neither, and tell you which.
• Bring your CPA into the ownership decision: own, lease, or PPA.

AI Colorado Solar is Jeff Bunge Solar LLC (dba Discovery Clean Energy), a Colorado installer with our own crews, serving all 64 counties. Call or text 720-370-8056, or visit aicoloradosolar.com/commercial.