Time-of-Use Rate

A time-of-use (TOU) rate is an electricity tariff in which the price per kilowatt-hour varies according to the time of day, the day of the week, and often the season. Utilities use TOU pricing to discourage consumption during high-demand windows and shift load toward hours when the grid has slack: on-peak hours can cost several times more than off-peak hours, with the gap sometimes reaching 3× to 5× or more between the cheapest overnight rate and the most expensive late-afternoon block. For most households the TOU calendar is a chore to live around. For a Bitcoin miner it is a lever.

A structural advantage for miners

Because ASICs can be powered up and down on demand — with no product spoiled, no customer waiting, no process interrupted — a mining operation is one of the few electrical loads that can chase the cheap hours perfectly. An operator can run at full hashrate through the overnight off-peak window and throttle or shut down entirely when prices spike. Done well, this pulls the blended cost of power down toward the off-peak rate rather than the flat average, materially improving margin on every satoshi mined. Where the spread is wide, mining only off-peak can be the difference between a machine that loses money and one that earns it.

Running the numbers

The trade-off is straightforward: idle machines earn nothing, so the savings from avoided peak power must outweigh the revenue lost while dark. A useful way to frame it is cost per terahash-hour under each schedule. Full throttle 24/7 buys maximum hashrate at the blended average rate; off-peak-only buys fewer hash-hours at the floor rate. Between the extremes sits underclocking through the peak instead of shutting down — dropping to a low-power profile keeps some revenue flowing (and, for a home miner, keeps the heat coming) while dodging the worst prices. The math favors aggressive TOU response most where the peak-to-off-peak spread is widest and where machines are older and less efficient, since their margins are thinnest at peak prices.

Implementation in practice

Capturing the benefit requires automation, not alarm clocks. That means scheduling tied to the utility's published TOU calendar — or, smarter still, to real-time price signals — driving the miners through their firmware or management API. Firmware-level schedules and power profiles, such as those DCENT_OS exposes on supported hardware (see DCENT_OS), let the machine step itself down and back up cleanly. Hardware tolerance matters too: modern miners handle daily power cycling well, but ramped profile changes are gentler than hard cuts. Home miners should also confirm whether their TOU plan is opt-in and whether winter and summer schedules differ, since the peak windows often move seasonally.

Heat as the second product

For home miners in cold climates, TOU schedules interact beautifully with heating. The cheap overnight window is exactly when a house wants heat, so a miner running as a space heater through off-peak hours displaces furnace or baseboard consumption at the lowest rate of the day — the effective cost of those sats is the off-peak rate minus the heating fuel it replaced. Some operators go further and let the heating requirement, not the TOU calendar alone, drive the schedule: full power when the house calls for heat during cheap hours, reduced profiles when it doesn't. It is one of the few consumer arbitrage plays where both products — heat and hashrate — are produced by the same watt, and the tariff design intended to push load off-peak ends up subsidizing exactly the hours a heater-miner wants to run anyway.

TOU strategy works best alongside an understanding of demand charges, a willingness to operate as a curtailable load the grid can lean on, and a clear view of how deliberate downtime affects your fleet's capacity factor.