One good product. Three different questions.

Keep three records: electricity used; money paid under the tariff or contract; and emissions, renewable-electricity attributes and their evidence. A cheaper time slot isn't necessarily lower-carbon. The same renewable-electricity attribute must not be claimed for multiple batches.

When the numbers surprise you

For the same 900 good units, 500 kWh × an assumed factor of 0.5 kg CO₂e/kWh gives 250 kg CO₂e. Using less electricity—450 kWh—but a different factor of 0.6 gives 270 kg CO₂e. These factors are made up for teaching; neither is a current regional factor.

Emissions from electricity use are not equal to the entire carbon footprint of the product

A product also involves raw materials, transport, fuel, use and disposal. If you only count electricity, say so clearly; that is not the product's full carbon footprint.

Pause here. What would you choose?

If a product is labeled "Electricity Emissions Reduced", can it be directly regarded as reducing the carbon footprint of the entire product?

Try it: power curves and electricity per good unit →

Sources: story manuscript pp. 17–23. This adapted story uses teaching scenarios, not customer measurements or equipment operating instructions.