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 — 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 — 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 — 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 — 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 — 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 — 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 — 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 — 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 — 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 — 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 — no charge, no obligation.
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