How are energy consumption and emissions measured correctly?
The minimum technical vocabulary to avoid being misled: kilowatt-hours, CO2 equivalent, emission factors, baseline. Including the classic mistakes to spot at a glance.
The kilowatt-hour: the unit that governs everything
The kilowatt-hour (kWh) measures energy: a one-kilowatt appliance running for one hour. Bills, panels, batteries, savings — everything is expressed in kWh (or its multiples, MWh and GWh). First professional habit: be wary of any energy claim without kWh — ”we significantly reduce consumption” is not a figure, it is a hope with a press office behind it.
CO2 equivalent: translating energy into climate
Climate impact is measured in CO2 equivalent (CO2e), which combines different greenhouse gases weighted by their effect. Electricity is converted into CO2e through the emission factor of the grid mix: how many grams of CO2e for every kWh produced in your country. The factor changes over time and by source: this is why any serious conversion declares which factor it uses and for which year — it is the first check to perform on any climate figure.
The baseline: the honest comparison
Every saving is a comparison: consumption after versus consumption that would have occurred without the intervention. That counterfactual is the baseline, and it is the point where figures are most easily manipulated — simply choosing a particularly wasteful year as a reference makes every intervention look like a miracle. An honest baseline uses representative periods, adjusts for variables that change (production, climate, schedules) and declares its method. That is the difference between measuring and storytelling.
Classic errors to recognise
Confusing power (kW) with energy (kWh) — a «100 kW system» says nothing about how much it produces. Comparing non-comparable months. Attributing to an intervention savings that are actually due to a drop in production. Using convenient emission factors. Forgetting the consumption that the intervention shifts elsewhere. Spotting these errors on the spot is half the job of those who measure — and the best defence for those who buy.
From the number to the register
In the Simbial method these numbers become entries in the register: indicator (kWh avoided, CO2e avoided), calculation method, evidence, verification level. An Impact Controller can recalculate and validate them, and from there the Impact Score is generated for the team and the company. The complete chain — honest measurement, transparent declaration, independent verification — is what makes energy the ideal sector for learning the discipline of impact: here the numbers either add up or they don't.
Frequently asked questions
What is the difference between kW and kWh?
The kW measures power (the instantaneous flow rate), the kWh measures energy (power multiplied by time). A 100 kW system says nothing about how much it produces: it depends on how many hours it operates and under what conditions.
What is CO2 equivalent?
The unit that aggregates greenhouse gases weighted by their climate impact. Electricity is converted to CO2e using the emission factor of the grid mix, which must always be declared with its source and year.
What is a baseline and why is it sensitive?
It is the reference consumption against which a saving is calculated. It is the easiest point to manipulate: an honest baseline uses representative periods, adjusts for variables, and declares the method.