Understanding your demand charge breakdown
How much of a typical bill is the demand charge
It varies a lot by rate structure and business type, but it's often a meaningful minority rather than a majority. A business with a 220 kW peak, an $18.50/kW demand rate, and 62,000 kWh of monthly usage at $0.11/kWh pays about $4,070 in demand charges against $6,820 in usage charges, a $10,890 total bill where demand makes up about 37.4% of the cost. To see how your own demand rate compares against other utilities nationwide, the National Laboratory of the Rockies maintains an open dataset of maximum demand charge rates pulled directly from utility tariff filings across the country. Feed that same demand share into the demand charge reduction estimator to see how much of it solar could realistically offset.
What load factor tells you
Load factor compares your actual average usage to what you'd use if you ran at your peak demand continuously all month, expressed as a percentage. A load factor of 39.1% means the business in the example above uses well under half of its billed peak capacity on average, which is common and usually signals room to either reduce the peak or use more power during off-peak hours. The Department of Energy's end-use load profile data is a useful reference for sanity-checking typical load patterns against your own bill. Businesses with high, steady usage tend to have load factors well above 50%, while those with sharp, brief spikes tend to run much lower, a pattern the time-of-use savings calculator can help you dig into further. If you want a second opinion on the size itself, the solar panel calculator in our System Sizing section works from your roof area and daily load instead of your building type.
Whether a low load factor means you're overpaying
Not necessarily, since demand charges exist because utilities have to build capacity for your peak even if you rarely use it, and a low load factor reflects real infrastructure cost. It does mean there may be an opportunity, since businesses with low load factors are often the best candidates for demand charge reduction strategies like solar, battery storage, or load shifting. The peak demand battery offset calculator is worth checking next if your load factor is on the lower end, or the battery storage size calculator in our battery storage section for the sizing math behind that decision. Incentives change the budget a lot. The federal tax credit calculator in our Rebates & Incentives section can help you estimate the federal credit and rebates before you commit.
Practical ways to bring the demand charge down
Solar can help if your peak demand tends to happen during sun hours, and a battery can help regardless of timing since it discharges precisely during the peak event. Staggering equipment startup times, shifting flexible loads to off-peak hours, and upgrading to more efficient equipment with lower inrush current are the main non-hardware options. Run your numbers through the demand charge reduction estimator to see which lever is likely to matter most for your load profile, and the solar savings calculator by utility rate to estimate the usage-charge side of your bill that solar alone would offset.