# All articles

> Every article published on The Demand Charge, grouped by section.

## Reading the Bill

Taking an industrial statement apart line by line, from billing determinants to riders.

- [How to Read an Industrial Electricity Bill, Line by Line](https://thedemandcharge.com/articles/how-to-read-an-industrial-electricity-bill): An industrial statement is four different charges stacked together, each priced on a different determinant. Here is what every line means and which ones respond to timing rather than volume.
- [A 12-Point Audit for Any Commercial Electricity Bill](https://thedemandcharge.com/articles/bill-audit-checklist): A 12-point electric bill audit for commercial accounts: meter multiplier, demand charge and ratchet arithmetic, riders and power factor. One bill, one tariff, one hour.
- [Billing Determinants — The Four Numbers That Set Your Bill](https://thedemandcharge.com/articles/billing-determinants-explained): Billing determinants are the metered quantities a utility prices on your bill: energy, billed demand, kVA and power factor. What each one is and how to check it.
- [Estimated Reads, True-Ups and Rebills — When the Meter Was Not Read](https://thedemandcharge.com/articles/estimated-reads-and-rebills): An estimated bill is a placeholder that gets corrected later. On a demand tariff the correction is not always straightforward, and it is worth knowing how yours is calculated.
- [How to Get Your Interval Data, and What to Do With It](https://thedemandcharge.com/articles/interval-data-how-to-get-it): A monthly bill tells you a peak happened. Fifteen-minute interval data tells you when, how often and what caused it — and it is usually available for free.
- [Meter Multipliers and CT Ratios — The Line That Silently Scales Your Bill](https://thedemandcharge.com/articles/meter-multiplier-ct-ratio): The meter multiplier on an electric bill turns the register reading into billed kWh and kW. How CT and PT ratios set it, and how to check that yours is right.
- [Rate Riders and Surcharges — The Charges That Are Not in the Rate](https://thedemandcharge.com/articles/riders-surcharges-explained): Rate riders are the charges added on top of the base rate: fuel adjustments, transmission recovery, program funding. What each attaches to, and what that does to your savings.
- [Supply Charges and Delivery Charges on a Business Bill](https://thedemandcharge.com/articles/supply-vs-delivery-charges): In a retail choice state the bill has two halves with two different owners. Shopping moves one of them. The demand charge usually sits in the half that no supplier can touch.
- [kW vs kWh — the Difference Between a Kilowatt and a Kilowatt-Hour](https://thedemandcharge.com/articles/kw-vs-kwh-difference): A kilowatt (kW) is a rate of electricity use; a kilowatt-hour (kWh) is an amount. What the difference means on a commercial bill, and why it changes savings math.

## Demand Charges

What the charge measures, how the interval is defined, and where the money actually sits.

- [What Is a Demand Charge? Demand Charges Explained](https://thedemandcharge.com/articles/demand-charges-explained): A demand charge bills the highest 15-minute kW your site drew in the month, priced per kW. What it measures, how it is calculated, and why utilities charge it.
- [4CP Explained — How ERCOT's Four Coincident Peak Sets Transmission Costs](https://thedemandcharge.com/articles/4cp-transmission-charges-ercot): 4CP is ERCOT's four coincident peak method: four summer intervals set a Texas facility's transmission charge for the following year. How it works and how to manage it.
- [Coincident vs. Non-Coincident Peak Demand](https://thedemandcharge.com/articles/coincident-vs-non-coincident-demand): Non-coincident peak demand is your own highest interval; coincident peak demand is your load when the grid peaked. How each is billed, and why each needs a different fix.
- [EV Fleet Charging and the Demand Charge](https://thedemandcharge.com/articles/ev-fleet-charging-demand-charges): The energy to charge a fleet is predictable. The demand charge it creates depends almost entirely on when the vans plug in and whether anything limits how fast they all draw at once.
- [Facility Demand, On-Peak Demand and Billing Demand](https://thedemandcharge.com/articles/facility-vs-on-peak-demand): Three terms that sound interchangeable and are not. A tariff can bill two of them at once, which is how a successful load shift produces half the expected saving.
- [PJM Capacity Tags and How Yours Is Set](https://thedemandcharge.com/articles/pjm-capacity-tag-explained): In PJM your capacity obligation is derived from your load during a handful of summer peak hours, and it prices a charge that follows you through the next delivery year.
- [Ratchet Clauses — How One Afternoon Prices the Next Eleven Months](https://thedemandcharge.com/articles/ratchet-clause-explained): A ratchet sets a floor under billing demand based on an earlier peak. It multiplies the cost of a single bad interval by a factor most business cases leave out entirely.
- [The Demand Interval — Why Fifteen Minutes Decides Your Bill](https://thedemandcharge.com/articles/demand-interval-15-minutes): The meter averages your load over a fixed interval and bills the highest average. Interval length, alignment and rolling versus fixed windows all change the number.
- [Why Utilities Bill for Demand at All](https://thedemandcharge.com/articles/why-utilities-charge-for-demand): The cost causation argument behind demand charges, what it explains well, and the places where it is contested in rate cases. Worth understanding before you argue about it.

## Peak Demand Management

Changing the shape of a load curve rather than its area — and knowing which levers move it.

- [How to Reduce Peak Demand Charges](https://thedemandcharge.com/articles/how-to-reduce-peak-demand-charges): How to reduce peak demand and the demand charge it sets: six measures from free sequencing to batteries, and the interval-data diagnostic that picks the right one.
- [Demand Limiting Controls and How They Fail](https://thedemandcharge.com/articles/demand-limiting-controls): A demand controller predicts the interval average and sheds load before the target is passed. The concept is sound; the implementations fail in a small number of predictable ways.
- [Demand Response Programs — What You Are Actually Selling](https://thedemandcharge.com/articles/demand-response-programs): You are not selling electricity. You are selling a commitment to reduce load on request, and the penalty structure for failing to deliver is the part worth reading twice.
- [Load Shifting Is Not Energy Efficiency](https://thedemandcharge.com/articles/load-shifting-vs-energy-efficiency): Efficiency reduces the area under the load curve. Shifting changes its shape. They save money on different lines of the bill, and confusing them wrecks business cases.
- [Pre-Cooling and HVAC Scheduling Against the Peak](https://thedemandcharge.com/articles/hvac-scheduling-demand): Buildings store heat. Running the cooling plant harder before the expensive window and coasting through it turns that thermal mass into free storage.
- [Six Efficiency Measures That Do Not Cut Your Demand Charge](https://thedemandcharge.com/articles/measures-that-dont-cut-demand): Every one of these saves real energy. None of them reliably reduces the highest fifteen-minute interval, and projects sold on the wrong line lose credibility for the next one.
- [Sizing a Battery for Peak Shaving](https://thedemandcharge.com/articles/battery-peak-shaving-sizing): Power rating and energy capacity are two separate specifications. A battery correct on one and wrong on the other fails to shave the peak while costing the full price.
- [Staggered Startup — The Cheapest Demand Measure There Is](https://thedemandcharge.com/articles/staggered-startup-sequencing): The highest interval of the month is frequently the moment after a break, when everything restarts together. Spreading those starts over twenty minutes usually costs nothing.
- [Thermal Energy Storage for Demand Reduction](https://thedemandcharge.com/articles/thermal-energy-storage-demand): Make cooling at night, use it during the peak. The cooling load is unchanged; the electrical load that produces it moves to hours where capacity is not being priced.
- [Why Rooftop Solar Rarely Cuts a Demand Charge](https://thedemandcharge.com/articles/solar-pv-and-demand-charges): Solar cuts kilowatt-hours reliably. It cuts the monthly peak only when the sun cooperates in every interval that matters, and Berkeley Lab's modeling shows how rarely that happens.

## Rate Schedules and Tariffs

Choosing between general service, time-of-use and real-time pricing with your own interval data.

- [How to Choose the Right Electricity Rate Schedule](https://thedemandcharge.com/articles/how-to-choose-a-rate-schedule): Being on the wrong tariff is among the most common avoidable overcharges in commercial billing. Modeling your own interval data against the alternatives settles it in a day.
- [Critical Peak Pricing for Commercial Customers](https://thedemandcharge.com/articles/critical-peak-pricing-explained): A few event days a year at a very high price, paid for by a discount on every other day. Whether that suits a site comes down to how many kilowatts it can drop when an event is called.
- [Demand-Heavy and Energy-Heavy Tariffs — Which Fits Your Load](https://thedemandcharge.com/articles/demand-vs-energy-heavy-tariffs): Two schedules can collect the same revenue from a utility's customers and treat your particular load very differently. One number tells you which side you are on.
- [How to Read a Utility Tariff Book](https://thedemandcharge.com/articles/tariff-book-how-to-read): The tariff is the contract, it is public, and almost nobody opens it. A method for extracting the six things that actually determine what you pay.
- [Real-Time Pricing — Who It Suits and Who It Ruins](https://thedemandcharge.com/articles/real-time-pricing-explained): Hourly wholesale-linked prices reward a site that can move load and punish one that cannot. The annual average is not the number that decides it.
- [Standby and Supplemental Charges for On-Site Generation](https://thedemandcharge.com/articles/standby-charges-onsite-generation): A site that makes some of its own power still needs the grid to be there when the generator is not. Standby tariffs price that readiness, and they decide many project cases.
- [Switching Rate Schedules — Notice, Minimum Stay and Eligibility](https://thedemandcharge.com/articles/rate-switching-rules): The modeling says switch. The tariff says how, when, and for how long you are committed. Reading the second document after the first is how a good analysis becomes a bad year.
- [Time-of-Use Rates for Commercial Accounts](https://thedemandcharge.com/articles/time-of-use-rates-commercial): Commercial time-of-use rates price each kWh by when it is used. How TOU schedules and windowed demand charges work, and how to tell whether one will save you money.

## Power Factor and Power Quality

Reactive power, penalty clauses, capacitor sizing and the discounts hiding at higher voltage.

- [Power Factor Penalty Explained, and How to Reduce It](https://thedemandcharge.com/articles/power-factor-penalties-explained): A power factor penalty bills the reactive power your site draws. The three tariff mechanisms behind it, what a low power factor costs, and how to reduce the penalty.
- [Harmonics, Resonance and Why Capacitors Sometimes Make It Worse](https://thedemandcharge.com/articles/harmonics-and-capacitors): Adding capacitance to a system full of drives can create a resonant circuit that amplifies the very currents it was meant to be indifferent to. Check before you order.
- [Sizing a Capacitor Bank](https://thedemandcharge.com/articles/power-factor-correction-sizing): The calculation is short and the target is not maximum correction. Sizing to land inside a band, with the harmonic environment checked first, is what separates a working installation from a failure.
- [Variable Frequency Drives and Displacement Power Factor](https://thedemandcharge.com/articles/vfd-power-factor): Drives are frequently sold as improving power factor, and in one sense they do. The sense that matters for your bill depends on which power factor your meter measures.
- [Voltage Level Discounts and Primary Metering](https://thedemandcharge.com/articles/voltage-level-discounts-primary-metering): Taking service at a higher voltage and owning your own transformer moves cost from the utility to you, and tariffs pay for that with a discount. Whether it is worth it is arithmetic.
- [kVA Billing and kW Billing](https://thedemandcharge.com/articles/kva-vs-kw-billing): Two tariffs can charge for demand in different units, and the choice of unit decides whether a capacitor bank is a strong investment or a complete waste.

## Cost Models, ROI and Incentives

Avoided-cost modeling, tax credits, incentive programs and measurement rigorous enough for finance.

- [Building the Business Case for Demand Reduction](https://thedemandcharge.com/articles/demand-reduction-business-case): Business demand reduction projects rarely fail on engineering. How to build the case: the all-in avoided cost per kW, NPV rather than payback, and a plan to prove the saving.
- [C-PACE Financing for Demand Reduction Projects](https://thedemandcharge.com/articles/c-pace-financing-energy-projects): C-PACE turns an energy project into a long assessment on the property tax bill. It can make a slow-payback measure cash-positive from year one, and the debt stays with the building.
- [Forecasting an Electricity Budget That Survives Contact With the Bill](https://thedemandcharge.com/articles/energy-budget-forecasting): Most electricity budgets are last year plus a percentage, which is why most of them are wrong. Forecasting the determinants separately produces a number you can defend in March.
- [Measurement and Verification That Finance Will Accept](https://thedemandcharge.com/articles/measurement-and-verification): A saving nobody can demonstrate is, for capital allocation purposes, a saving that did not happen. Deciding how it will be proved belongs before the equipment is installed.
- [The Investment Tax Credit and Depreciation on Energy Equipment](https://thedemandcharge.com/articles/itc-and-depreciation-energy-equipment): Tax treatment can move the after-tax cost of an energy asset substantially. What the rules are is a question for the IRS and your adviser — what they change in the model is a question you can answer.
- [Total Cost of Ownership for a Behind-the-Meter Battery](https://thedemandcharge.com/articles/battery-tco-model): Installed cost is the visible number and rarely the decisive one. Degradation, augmentation, availability and end-of-life determine whether a fifteen-year case actually holds.
- [Utility Incentive Programs — Custom, Prescriptive and Where the Money Is](https://thedemandcharge.com/articles/utility-incentive-programs): You are already funding these programs through a rider on your own bill. The application process is where most of the available money is left uncollected.
- [What a Kilowatt of Avoided Peak Is Actually Worth](https://thedemandcharge.com/articles/avoided-cost-per-kw): The base demand rate is not the answer. Riders, taxes, the ratchet and seasonality all change the figure, usually upward, and the correct number decides every project after it.

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