The library
Every article on the site
Grouped by subject area. Nothing is paginated and nothing is hidden behind a script: every link below is in the HTML.
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 9 min read 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 4 min read A repeatable review that takes about an hour with one bill and one tariff sheet, and finds the errors and mismatches that persist for years because nobody checks.
- Billing Determinants — The Four Numbers That Set Your Bill 4 min read Every dollar on a commercial electricity statement is a measured quantity multiplied by a price. Learn the four determinants and the bill stops being a mystery.
- Estimated Reads, True-Ups and Rebills — When the Meter Was Not Read 4 min read 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 4 min read 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 4 min read On instrument-metered services the register reading is multiplied before it reaches the bill. When that multiplier is wrong, every determinant is wrong by the same factor.
- Riders and Surcharges — The Charges That Are Not in the Rate 4 min read Fuel adjustments, transmission recovery, efficiency program funding and public benefit charges sit on top of the base rate. What they attach to decides what your savings project is worth.
- kW vs kWh — Why Your Bill Has Two Different Units 4 min read Kilowatts are a rate, kilowatt-hours are a quantity, and your utility bills for both separately. Getting the distinction wrong is how savings projections end up wrong.
Demand Charges
What the charge measures, how the interval is defined, and where the money actually sits.
- Demand Charges Explained 9 min read What a demand charge measures, why utilities levy it, how the fifteen-minute interval works, and why two plants with identical consumption can receive very different bills.
- Coincident and Non-Coincident Demand 4 min read One charge bills your own highest interval. The other bills whatever you were drawing when the grid peaked. They are different problems and they need different solutions.
- Facility Demand, On-Peak Demand and Billing Demand 4 min read 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.
- Four Coincident Peak — How ERCOT Transmission Costs Are Allocated 5 min read Four fifteen-minute intervals across one summer set a Texas facility's transmission charge for the whole following year. Here is the mechanism and what managing it involves.
- PJM Capacity Tags and How Yours Is Set 4 min read 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 4 min read 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 4 min read 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 5 min read 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 8 min read A ladder of measures from free to capital-intensive, with the diagnostic that tells you which rung your site is actually on and the arithmetic for deciding between them.
- Demand Limiting Controls and How They Fail 4 min read 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 5 min read 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 4 min read 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 4 min read 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 4 min read 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 4 min read 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 4 min read 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 4 min read 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.
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 8 min read 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.
- Demand-Heavy and Energy-Heavy Tariffs — Which Fits Your Load 4 min read 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 4 min 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 4 min read 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 4 min read 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 4 min read 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 4 min read The same kilowatt-hour costs different amounts depending on when it arrives. Whether that helps or hurts depends entirely on how much timing latitude your operation really has.
Power Factor and Power Quality
Reactive power, penalty clauses, capacitor sizing and the discounts hiding at higher voltage.
- Power Factor Penalties Explained 8 min read Reactive power does no useful work and still has to be carried by the wires. Three different tariff mechanisms bill you for it, and they are not equivalent.
- Harmonics, Resonance and Why Capacitors Sometimes Make It Worse 4 min read 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 5 min read 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 4 min read 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 4 min read 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 4 min read 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 8 min read The engineering on these projects is usually right. What fails is the financial framing — the wrong avoided cost, a payback number where an appraisal was needed, and no plan to prove the saving.
- Forecasting an Electricity Budget That Survives Contact With the Bill 4 min read 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 4 min read 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 4 min read 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 4 min read 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 4 min read 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 4 min read 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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