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ToolsPower outside opening hours

How much of your power bill is spent outside opening hours?

For any business with its own premises and meter, a shop, cafe, office, clinic or workshop. Drop the smart meter download from your utility, set your opening hours, and see what your electricity cost while nobody was there, with every sum shown. A calculation from your own readings, not an energy audit.

Sample building, a summer of meter readings

A business’s readings every 15 minutes, all made up for this demo

Your opening hours

Set the hours your building is open. Everything outside them counts as outside your opening hours.

Spent outside your opening hours

$2,325.15

From 1 July to 30 September 2026 your building was open 50 hours a week, yet $2,325.15 of your $5,542.21 electricity cost, 42.0%, went on power used outside those hours, $443.85 of it on Sundays.

$5,542.21 = $2,325.15 outside your opening hours + $3,217.06 inside them, the COST column added up over 8,832 readings. 42.0% = $2,325.15 outside your opening hours ÷ $5,542.21 your file’s electricity cost. 50 hours a week = 5 weekdays × 10 hours, 8am to 6pm, Saturday shut, Sunday shut. $443.85 on Sundays = 1,248 readings outside your hours on 13 Sundays, added up.

Each day of the week

DayHow many in your fileYour hoursOutside your hoursIts readings added upInside your hoursIts readings added upThe day’s costOutside + insideShare outside your hoursOutside ÷ the day’s cost
Sunday13 Sundaysshut all day$443.851,248 readings, 1,043.53 kWh
The most outside your hours		$0.000 readings, 0 kWh$443.85$443.85 + $0.00100.0%$443.85 ÷ $443.85
Saturday13 Saturdaysshut all day$442.771,248 readings, 1,040.5 kWh$0.000 readings, 0 kWh$442.77$442.77 + $0.00100.0%$442.77 ÷ $442.77
Wednesday14 Wednesdays8am to 6pm$300.45784 readings, 702.29 kWh$697.81560 readings, 1,654.83 kWh$998.26$300.45 + $697.8130.1%$300.45 ÷ $998.26
Monday13 Mondays8am to 6pm$297.46728 readings, 694.72 kWh$613.89520 readings, 1,455.94 kWh$911.35$297.46 + $613.8932.6%$297.46 ÷ $911.35
Thursday13 Thursdays8am to 6pm$289.03728 readings, 672.25 kWh$646.84520 readings, 1,533.98 kWh$935.87$289.03 + $646.8430.9%$289.03 ÷ $935.87
Friday13 Fridays8am to 6pm$276.25728 readings, 644.93 kWh$611.01520 readings, 1,448.88 kWh$887.26$276.25 + $611.0131.1%$276.25 ÷ $887.26
Tuesday13 Tuesdays8am to 6pm$275.34728 readings, 643.4 kWh$647.51520 readings, 1,535.02 kWh$922.85$275.34 + $647.5129.8%$275.34 ÷ $922.85
Every day92 days50 hours a week$2,325.15The days above added up$3,217.06The days above added up$5,542.21$2,325.15 + $3,217.0642.0%$2,325.15 ÷ $5,542.21

Each hour of the day

Hour of the dayReadings that start in itOutside your hours onOutside your hoursIts readings added upInside your hoursIts readings added up
midnight to 1am368 readingsEvery day$102.45255.84 kWh$0.000 kWh
1am to 2am368 readingsEvery day$95.82239.27 kWh$0.000 kWh
2am to 3am368 readingsEvery day$95.19237.72 kWh$0.000 kWh
3am to 4am368 readingsEvery day$92.92231.88 kWh$0.000 kWh
4am to 5am368 readingsEvery day$88.36220.52 kWh$0.000 kWh
5am to 6am368 readingsEvery day$90.49225.98 kWh$0.000 kWh
6am to 7am368 readingsEvery day$81.46203.36 kWh$0.000 kWh
7am to 8am368 readingsEvery day$172.65430.46 kWh$0.000 kWh
8am to 9am368 readingsSaturday and Sunday$22.0955.13 kWh$233.20581.75 kWh
9am to 10am368 readingsSaturday and Sunday$24.4160.93 kWh$252.72630.44 kWh
10am to 11am368 readingsSaturday and Sunday$25.5663.78 kWh$272.39679.69 kWh
11am to noon368 readingsSaturday and Sunday$28.3770.84 kWh$289.10721.56 kWh
noon to 1pm368 readingsSaturday and Sunday$32.6681.57 kWh$295.25736.74 kWh
1pm to 2pm368 readingsSaturday and Sunday$38.0394.85 kWh$322.66805.06 kWh
2pm to 3pm368 readingsSaturday and Sunday$45.40107.55 kWh$353.81839.14 kWh
3pm to 4pm368 readingsSaturday and Sunday$48.22114.3 kWh$363.03861.07 kWh
4pm to 5pm368 readingsSaturday and Sunday$57.94123 kWh$416.52884.57 kWh
5pm to 6pm368 readingsSaturday and Sunday$59.28125.93 kWh$418.38888.63 kWh
6pm to 7pm368 readingsEvery day$320.81681.19 kWh$0.000 kWh
7pm to 8pm368 readingsEvery day$217.83462.45 kWh$0.000 kWh
8pm to 9pm368 readingsEvery day$191.57406.84 kWh$0.000 kWh
9pm to 10pm368 readingsEvery day$145.35344.72 kWh$0.000 kWh
10pm to 11pm368 readingsEvery day$133.04315.64 kWh$0.000 kWh
11pm to midnight368 readingsEvery day$115.25287.87 kWh$0.000 kWh
Every hour8,832 readings$2,325.15The hours above added up$3,217.06The hours above added up

What this counts

  • The money is your file’s COST column, your utility’s own estimate for each reading. Fixed charges and demand charges on your bill are not in it, so the total is not your bill.
  • A reading counts as outside your opening hours when it starts outside them. Opening hours are on the whole hour, so a reading never straddles opening or closing.
  • The day is the date your file gives, and the time is your file’s own clock, your building’s local time. A holiday counts by its weekday’s hours.
  • Electricity only. Gas readings, and readings of a whole day, are left out.

Runs in your browser. Your file is never uploaded.Want every site’s energy checked against its opening hours each month? Talk to us

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