Calculator
Off-hours gas savings calculator
Cost out off-hours gas burn at your own rate, with an optional carbon price, and see what baseload creep is quietly worth over a year.
What it asks for: m³/h · off-hours a year · $/m³ · carbon price ($/tonne).
Run the numbers
What off-hours gas costs
What burning through a shutdown costs over a year, with the tonnes of CO₂e that go with it sitting right beside the dollars.
What it costs you
$45,000/yr
- 180,000cubic metres a year
- $45,000of it is the gas itself
- 348tonnes CO₂e a year
Conservative arithmetic, verified against your own utility bills. Your number comes from your own meters.
The assumptions behind this
gas.rate· 0.25 $/m³ (all-in delivered)[TOM-REVIEW]Enbridge Gas tariffs effective 2026-07-01, OEB Order EB-2026-0156, covering delivery + transportation + gas supply + Rider C cost adjustment, HST excluded. Computed all-in at a mid-size factory's volume: $0.2353/m³ for EGD-zone Rate 6 at 500,000 m³/yr and $0.2605/m³ for Union South Rate M2 (which is Guelph's zone; transportation there is $0 and the commodity rate correspondingly higher). $0.25 brackets both. Delivery is a DECLINING BLOCK billed monthly, so the marginal rate a factory actually saves by not burning gas is nearer $0.23–$0.25. QRAM resets these quarterly, and the next change is 2026-10-01.gas.ghgFactor· 1.931 kg CO₂e/m³[TOM-REVIEW]Environment and Climate Change Canada, 'Emission factors and reference values' v3.0 (October 2025), Tables 1.3 and 2.3 for calendar year 2026, sourced from the National Inventory Report 1990–2023 Part 2, for Ontario marketable natural gas, Industrial/Manufacturing combustion: CO₂ 1,921 g/m³ + CH₄ 0.037 g/m³ × 28 + N₂O 0.033 g/m³ × 265 = 1,930.78 g CO₂e/m³. AR5 global warming potentials, per Schedule 3 of the Greenhouse Gas Pollution Pricing Act. Using AR4 instead gives 1.932 kg, so the GWP vintage does not move this number. Combustion only, with no upstream or fugitive methane. Volumes at 15 °C and 101.325 kPa.gas.carbonPrice· 0 $/tonne CO₂e[TOM-REVIEW]ZERO, and deliberately so. The federal fuel charge on natural gas has been $0 since 2025-04-01, per CRA Notice FCN16: 'the Government of Canada made regulations that cease the application of the federal fuel charge, by setting all fuel charge rates to zero', and Enbridge's own OEB-approved Rider J prints 0.0000 ¢/m³ against EVERY rate class, large-industrial ones included. Ontario's Emissions Performance Standards charge $95/tonne in distribution year 2026 (ontario.ca; note that aggregators widely misreport this as $110, Ontario's schedule lags the federal benchmark by a year), but EPS applies only to facilities that have reported 50,000 t CO₂e or more, which is about 25.9 million m³/yr of gas. A factory burning 500,000 m³/yr emits ~965 t and is nowhere near it. So the defensible default marginal carbon cost is $0, and the honest way to show the carbon side of a saving is TONNES AVOIDED rather than dollars.
Every constant used here shows its source under the result. [TOM-REVIEW] before launch (§G.2). Nothing is hard-coded in a component; the constants live in src/data/benchmarks.json and the city rates in src/data/water-rates.json.
Where these numbers come from
Every constant, its value, and the document it was read out of.
gas.rate· 0.25 $/m³ (all-in delivered)[TOM-REVIEW]Enbridge Gas tariffs effective 2026-07-01, OEB Order EB-2026-0156, covering delivery + transportation + gas supply + Rider C cost adjustment, HST excluded. Computed all-in at a mid-size factory's volume: $0.2353/m³ for EGD-zone Rate 6 at 500,000 m³/yr and $0.2605/m³ for Union South Rate M2 (which is Guelph's zone; transportation there is $0 and the commodity rate correspondingly higher). $0.25 brackets both. Delivery is a DECLINING BLOCK billed monthly, so the marginal rate a factory actually saves by not burning gas is nearer $0.23–$0.25. QRAM resets these quarterly, and the next change is 2026-10-01.gas.ghgFactor· 1.931 kg CO₂e/m³[TOM-REVIEW]Environment and Climate Change Canada, 'Emission factors and reference values' v3.0 (October 2025), Tables 1.3 and 2.3 for calendar year 2026, sourced from the National Inventory Report 1990–2023 Part 2, for Ontario marketable natural gas, Industrial/Manufacturing combustion: CO₂ 1,921 g/m³ + CH₄ 0.037 g/m³ × 28 + N₂O 0.033 g/m³ × 265 = 1,930.78 g CO₂e/m³. AR5 global warming potentials, per Schedule 3 of the Greenhouse Gas Pollution Pricing Act. Using AR4 instead gives 1.932 kg, so the GWP vintage does not move this number. Combustion only, with no upstream or fugitive methane. Volumes at 15 °C and 101.325 kPa.gas.carbonPrice· 0 $/tonne CO₂e[TOM-REVIEW]ZERO, and deliberately so. The federal fuel charge on natural gas has been $0 since 2025-04-01, per CRA Notice FCN16: 'the Government of Canada made regulations that cease the application of the federal fuel charge, by setting all fuel charge rates to zero', and Enbridge's own OEB-approved Rider J prints 0.0000 ¢/m³ against EVERY rate class, large-industrial ones included. Ontario's Emissions Performance Standards charge $95/tonne in distribution year 2026 (ontario.ca; note that aggregators widely misreport this as $110, Ontario's schedule lags the federal benchmark by a year), but EPS applies only to facilities that have reported 50,000 t CO₂e or more, which is about 25.9 million m³/yr of gas. A factory burning 500,000 m³/yr emits ~965 t and is nowhere near it. So the defensible default marginal carbon cost is $0, and the honest way to show the carbon side of a saving is TONNES AVOIDED rather than dollars.
Want the real number instead of the estimate?
This page gives you an estimate from numbers you already half know. A meter gives you the real one. We will walk your floor, tell you what is worth measuring first, and put a figure on it.
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