If your commercial electricity bill is higher than your usage seems to justify, the answer is often hiding in two line items most owners overlook: demand charges and power factor. These are not the same as the energy you consume, and they can quietly add a meaningful amount to what your Houston business pays each month. Understanding demand charges and power factor is one of the best ways to find savings that have nothing to do with switching providers.
Energy vs. Demand: Two Different Things
Most people think of electricity in terms of kilowatt-hours, or kWh, which measure the total energy you use over a billing period. But many commercial accounts are also billed on demand, measured in kilowatts, or kW. Demand is the highest rate of power you pull at any single moment during the month, usually averaged over a short interval.
The difference matters. Energy is like the total distance you drive in a month. Demand is like your top speed during that month. Two Houston businesses can use the same total kWh, but the one that spikes hard, firing up large equipment all at once, can set a much higher demand peak and pay more, even though their total energy is identical.
Why Demand Charges Can Dominate a Bill
Demand charges exist because the grid and your TDSP, CenterPoint Energy for most of Houston, have to build capacity to meet your highest moment of need, not just your average. A brief spike forces the system to be ready for that load, so it is priced accordingly. On some commercial rate structures, demand charges make up a surprisingly large share of the total bill.
What makes this frustrating is that a single short spike can set your demand charge for the entire month. If your equipment all kicks on at once on one hot afternoon, that peak can follow you across the whole billing cycle, regardless of how careful you were the rest of the time.
Power Factor: The Hidden Efficiency Penalty
Power factor is a measure of how efficiently your business turns the electricity it draws into useful work. Equipment like motors, compressors, and certain lighting can create a gap between the power the grid supplies and the power you actually use productively. When that gap is large, your power factor is low, and some utilities apply a penalty because the grid has to carry more than your useful load.
Say your business uses around 200,000 kilowatt-hours a year and runs significant motor-driven equipment. A low power factor could mean an extra charge on your bill that better-corrected equipment might reduce. Power factor correction, often through equipment a qualified electrician or engineer can advise on, is one path some facilities use to lower that penalty.
Practical Ways to Manage Both
A few moves can help you take control. Look at your bill for a demand or kW charge and a power factor figure, so you know whether they apply to you. Where it is safe and practical, stagger the startup of large equipment so everything does not spike at once and set a high demand peak. Consider whether shifting flexible, energy-heavy tasks away from your busiest window could lower your peak. And if you run a lot of motor-driven equipment, ask a qualified professional whether power factor correction makes sense for your facility.
A Simple Next Step
Demand charges and power factor are technical, but they are also where real savings often hide on a commercial bill. At Excelsior Energy, we read these line items for Houston businesses and flag when demand or power factor is quietly inflating your total. If you want us to look at where your bill is really going, we are happy to do a free bill review. Call us at 713-898-3164 and we will walk through your numbers, no pressure and no jargon.