Why Is Offsetting Not Accepted in a Corporate Carbon Footprint?

One of the most common questions in corporate carbon footprint work is: "We invested in solar panels. Can't we deduct the electricity we generate from the electricity we consume?" At first glance, this sounds reasonable: on one side, consumed electricity; on the other, clean electricity generation. But in carbon accounting, directly netting these two values is not acceptable as an offsetting practice. In this article, we explain why this approach conflicts with core carbon accounting principles, with a focus on grid electricity and renewable generation.

Grid Electricity and Scope 2: Certificates Are Not Offsetting

Electricity purchased from the grid creates your Scope 2 emissions. You consume the electricity, but emissions occur at the power plant that generates it. There are two accounting methods: location-based and market-based. The location-based method uses the average grid emission factor. The market-based method allows certified renewable electricity purchases (for example via YEK-G or I-REC) to be accounted for with a zero emission factor.

The key distinction is this: a certificate is not an offsetting instrument. Certificates do not erase emissions elsewhere; they document the source of the electricity you consume. Using certified electricity can be inventory-compliant, but reducing reported emissions with unrelated carbon credits inside the inventory total is not.

Self-Generated Electricity: When It Reduces, and When It Doesn’t

If you directly consume electricity generated from your rooftop solar system, the amount of electricity drawn from the grid decreases. As a result, your Scope 2 emissions decrease as well.

This is not carbon offsetting. What happens here is that part of your electricity consumption is met by your own renewable generation instead of grid electricity.

However, the evaluation changes when generated electricity is sold to the grid.

For example, consider an organization that consumes 1,000 MWh of grid electricity per year, generates 400 MWh from its solar plant, and sells all that generation to the grid. In this case, the organization’s electricity consumption is still 1,000 MWh, and Scope 2 is calculated based on that consumption.

Using the revenue from selling generated electricity to the grid while also deducting the same generation’s carbon benefit from the organization’s own emissions creates a risk of counting the same environmental benefit more than once. This situation, known as double counting, is strictly prohibited in carbon accounting.

What Is the Right Approach?

In corporate carbon footprint studies, three key principles can be summarized as follows:

First, measure and report your emissions on a gross basis. Second, reflect your renewable electricity generation and certified electricity purchases in your inventory using the correct accounting method. Third, disclose balancing activities such as carbon credits in a separate section, not inside the inventory total.

This approach helps present emissions transparently, account for renewable electricity correctly, and report balancing activities without confusing them with emission reductions. As a result, reports become both aligned with international standards and ready for assurance.

For support on your corporate carbon footprint calculations, ISO 14064-1 verification processes, and Scope 2 strategies, you can contact the 3pmetrics team.

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