The Tool Desk
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Why the headline rate is not enough
A mining facility’s electricity bill can include more than the energy consumed. Depending on the local tariff and supply contract, costs may include demand, delivery, transmission, capacity, fixed, tax, and other pass-through charges. Some prices vary by time of day, season, or wholesale market conditions; others are fixed or adjust under specified contract terms. A low energy-only rate can therefore produce a higher total bill than a seemingly more expensive offer.
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Electricity runs both the mining machines and the systems that cool them. The U.S. Energy Information Administration (EIA) identifies electricity as a primary mining operating expense and notes that mining-machine efficiency is measured in joules per terahash. Efficiency gains do not guarantee a lower electricity bill: mining difficulty can rise, and the site’s cooling and auxiliary loads also matter. Model the equipment and operating profile you expect to use rather than relying on a generic estimate.
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Build a realistic load forecast
Before comparing offers, estimate how much electricity the whole facility will use and when it will use it. The distinction between energy and demand is important: energy is consumption over time, typically billed in kilowatt-hours (kWh); demand is the rate of electricity use at a point or over a measurement interval, typically expressed in kilowatts (kW). A tariff may bill both.
Count the full site, not just the ASICs
- List the proposed ASIC fleet and its expected operating schedule, using the equipment’s expected electrical input rather than a mining-output figure.
- Add cooling, fans, pumps, networking, lighting, controls, and other auxiliary loads.
- Account for the facility’s capacity limits, expected uptime, maintenance, and seasonal operating changes.
- If the site already operates, use interval-meter data where available. It can reveal peaks and load variation that a monthly kWh total will hide.
A rough energy estimate is average site load in kW multiplied by operating hours, divided by 1,000, to get kWh. This is only a starting point: demand charges, time-based rates, and actual load peaks require a time-shaped forecast, not a single average. Ask the utility or supplier which demand interval and measurement rules apply.
Rank #2
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Allow for changing mining conditions
Mining revenue and operating conditions can change while a power contract remains in force. EIA’s February 2024 account estimated that cryptocurrency mining used 0.6%–2.3% of U.S. electricity consumption; EIA described that as a preliminary estimate of annual U.S. cryptocurrency-mining use, not a precise current figure for Bitcoin alone. The national estimate does not tell an operator what its facility will consume or what it will pay. EIA also notes that mining assets can move in response to electricity prices, underscoring how location-specific the economics are.
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Compare the actual price structure and contract
Obtain the full applicable utility tariff and every supplier offer, including riders, schedules, and contract documents. EIA says it does not collect or publish individual utility electricity rates, tariffs, or demand charges. Its FAQ points readers to the DOE-sponsored Utility Rate Database/OpenEI and to utility schedules; the actual terms for a site must be confirmed locally. Read EIA’s explanation of rate, tariff, and demand-charge data.
Use the same hourly or interval load forecast to model every offer. Separate expected cost from the risks that could make the bill or operating obligation materially different.
Rank #3
| Offer feature | What it means for the bill | What to verify |
|---|---|---|
| Fixed-price energy | Energy charges follow a stated price for the contract’s defined term, subject to the contract’s inclusions and adjustment clauses. | Which charges are actually fixed; the term; exclusions, pass-throughs, and price-adjustment rights. |
| Indexed energy | Some or all energy cost follows a market index or other variable reference, exposing the facility to price changes. | Index, settlement interval, adders, caps or floors, billing rules, and treatment of extreme prices. |
| Time-of-use or seasonal rates | Energy costs differ by defined hours or seasons, so the site’s operating schedule affects the result. | Peak periods, seasonal calendars, holidays, rate changes, and whether the ASIC and cooling load can shift safely. |
| Demand charges | A charge may depend on the site’s measured peak demand, not only total energy use. | Measurement interval, peak definition, ratchets or other billing rules, and whether a brief load spike can set a charge. |
| Interruptible or curtailable rate | A lower rate may come with an obligation to reduce demand or accept a temporary interruption under specified conditions. | Notice, event duration and frequency, dispatch authority, measurement and baseline rules, compensation, penalties, and restart requirements. |
Also identify delivery and transmission charges, capacity charges, fixed fees, taxes, minimum-use terms, and all other pass-throughs. Review the contract term, renewal, credit or security requirements, termination rights, and force majeure language. Ask whether the service voltage, available capacity, interconnection, transmission constraints, and local reliability suit the proposed site. If a supplier advertises renewable power, direct supply, or co-location, verify what the claim means in the contract and in physical operation; marketing language alone does not establish continuous physical delivery.
Decide whether curtailment is worth it
An interruptible or curtailable rate can lower costs in exchange for reducing load on short notice or accepting a temporary cutoff under specified conditions. EIA describes these arrangements in its glossary of interruptible load and interruptible or curtailable rates. For a miner, the discount is valuable only if it exceeds the contribution lost during a dispatch event and the operational costs or risks of shutting down and restarting.
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Put the obligation in measurable terms
Before accepting a discount, get the event rules in writing. Determine who can call an event, how much notice is required, the maximum duration and frequency, how the baseline and delivered reduction are measured, and whether missed performance triggers a penalty or loss of compensation. Clarify restart constraints and any minimum run time or recovery period. Do not assume that an announced program or a supplier’s description gives you the same rights and obligations as the signed tariff or contract.
Estimate the operation’s safe curtailment capability: how much load can be shed, how quickly, and for how long without violating equipment, cooling, staffing, or site constraints. Compare the resulting expected bill savings with the foregone mining contribution and any event, restart, or performance costs. Stress-test the decision for uncertain event timing and lower mining revenue. If the contract’s dispatch rules or event exposure cannot be quantified, the discount cannot be compared responsibly with a firm supply option.
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Treat demand-response examples as time- and place-specific
EIA’s February 1, 2024 article described miners participating in demand-response programs and cited ERCOT’s Large Flexible Load program, which at that time had enlisted up to 1,530 MW of large industrial consumers to curtail use. The figure is a dated program snapshot, not a current participation total or an assurance of eligibility. The same EIA account cited estimates by operators of two Rockdale, Texas facilities of up to 500 MW each; these illustrate the scale of particular large sites, not a typical mining operation. Confirm current program rules, eligibility, and service arrangements with the relevant utility and grid operator.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Follow a site-specific comparison process
- Set the geography and market structure. Confirm the utility service territory, retail-choice rules, relevant grid operator, and which entities may sell or deliver electricity at the site. Tariffs and market rules differ by jurisdiction; U.S. examples do not apply everywhere.
- Forecast the site load. Build an interval or hourly profile for the ASIC fleet, cooling, auxiliary equipment, capacity limits, uptime, and seasonal operation. Use existing interval data when available.
- Collect complete offers. Obtain the utility tariff, supplier offer, riders, and contract terms. Confirm that quoted prices and charges apply to the site and its customer class.
- Model comparable bills. Apply each offer’s energy, demand, delivery, capacity, fixed, and pass-through charges to the same load shape. Record assumptions and separate recurring charges from conditional or variable costs.
- Stress-test both price and operations. Test seasonal peaks, high-price periods, downtime, lower mining revenue, and possible curtailment events. Keep market-price risk distinct from interruption risk.
- Value flexibility only after modeling it. Compare any curtailment discount or program payment with lost operating contribution, dispatch terms, event limits, and restart constraints.
- Evaluate storage or onsite generation on its own economics. Require site load data, tariff details, equipment costs, and operating assumptions rather than assuming a universal saving.
- Review the final arrangement locally. Have the tariff, service arrangement, and contract reviewed by the utility or a qualified commercial energy adviser familiar with the market and the facility’s stakes.
When storage may help—and what it cannot guarantee
A battery can potentially shift electricity use away from peak periods and may reduce demand charges, depending on the tariff, battery, load, dispatch strategy, and cost. EIA describes these possible uses of energy storage, but that does not establish a payback for a Bitcoin-mining facility. Model storage against the same interval load and tariff as the electricity offers, including its equipment and operating costs. Onsite generation likewise needs a site-specific technical and economic analysis; neither option is an automatic bill reduction.
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