Tool · report-ready output

Carbon Savings Certificate — from kW to a report line

Every framework on this site wants the same three numbers about an efficiency measure: kWh, t CO2e, money. This tool computes them from an eliminated heat loss — ASTM C680 method, published DESNZ 2024 emission factors, your fuel price — and prints a certificate your SECR paragraph, ESOS update, E1-3 entry or tender CRP can cite.

Turn a saving into a report figure →All reporting guides

The tool

Eliminated heat loss (kW)

From a survey or the heat-loss calculator — e.g. 46 bare DN150 valves ≈ 25 kW

Operating hours per year Boiler / system efficiency (%)

Heat lost at the pipe costs MORE fuel at the boiler — losses divide by efficiency

Fuel Your fuel price (£ or € per kWh) Project description (prints on the certificate) Company / site (prints on the certificate)

Report-ready annual figures

—

fuel saved / yr

—

fuel cost saved / yr

—

value at EU ETS €77.4/t

—

≈ passenger cars off the road

🖨 Print / save as PDF ⬇ Download figures (CSV)

Certificate prints below — fill company/site first. Need the kW measured? Free survey →

inzonex.co.uk/carbon/reporting/

Carbon Savings Certificate

Verified annual energy & emissions saving

Issued for:

Measure:

Eliminated standing heat loss
Annual fuel saving (, system efficiency , )
Annual GHG saving (UK DESNZ 2024 factors)
Annual fuel cost saving (at entered price)

Method: steady-state heat-loss calculation to ASTM C680 / ISO 12241; emission factors: UK Government GHG Conversion Factors 2024 (DESNZ); fuel-side losses scaled by stated system efficiency. Figures are engineering estimates suitable for SECR energy-efficiency disclosures, ESOS action-plan progress, ESRS E1-3 action reporting and tender Carbon Reduction Plans; metered verification recommended for assurance. Issued via the Inzonex Carbon Hub reporting toolkit — modular removable insulation, UK Patent GB2508992.1 · contact@inzonex.co.uk

Date: ____________________

Signed (site engineer): ____________________

The conversion factors used

Fuel	kg CO2e/kWh (DESNZ 2024)	Default price/kWh (editable)
Natural gas	0.183	£0.035
LPG	0.214	£0.080
Gas oil / diesel	0.257	£0.070
Heavy fuel oil	0.267	£0.060
Coal (industrial)	0.345	£0.020
Grid electricity (UK 2024)	0.207	£0.250

Source: UK Government GHG Conversion Factors for Company Reporting 2024 (DESNZ), kg CO2e per kWh, gross CV. Car equivalence: ~4.6 t CO2e per average passenger car-year (EPA figure). Prices are editable defaults — enter your contract price.

Where each number goes

Framework	Section	What it takes from here
SECR (UK)	Disclosure 4 — energy-efficiency action narrative	MWh + t CO2e + method
ESOS (UK)	Action-plan progress update	kW finding → implemented saving
ESRS E1 (EU)	E1-3 actions & resources	figures + CapEx + target link
Tender CRP	Completed carbon-reduction initiatives	achieved annual saving, verified
CBAM (exporters)	Lower embedded emissions per tonne of product	t CO2e ÷ production volume
SBTi / CDP	Evidence of action, annual progress	t CO2e vs ~4.2%/yr pathway

FAQ

Questions on this topic

Is this certificate an official document?

It's an engineering statement with named methods (ASTM C680 / ISO 12241, DESNZ 2024 factors) — the same basis consultants use. For statutory assurance, back it with metered before/after consumption; the certificate states this explicitly.

Why does boiler efficiency increase the saving?

Heat lost from a pipe was generated by a boiler that is not 100% efficient — eliminating 1 kWh of standing loss saves roughly 1/0.82 ≈ 1.22 kWh of fuel at a typical 82% efficient system.

Where do I get the kW figure?

From an insulation survey (we run them free for qualifying industrial sites) or the free heat-loss calculator at inzonex.co.uk/calc — both use the same ASTM C680 method.

Can I use these figures in a CBAM context?

Yes — divide the annual t CO2e saving by your production volume to see the reduction in embedded emissions per tonne of product, which flows into the data your EU importer declares.

How this page is built: framework facts cite the legal text or official guidance named in each section (SECR: Companies (Directors' Report) Regulations 2018; ESOS: Energy Savings Opportunity Scheme Regulations; CBAM: Regulation (EU) 2023/956; CSRD/ESRS: Delegated Regulation (EU) 2023/2772). Savings figures follow ASTM C680 / ISO 12241 — the method behind our public calculators. Published by Inzonex — manufacturer of modular removable insulation (UK Patent GB2508992.1). This is practical guidance, not legal advice. Spotted an error? Tell us.