The I-TRACK Foundation is pleased to announce the launch of ResidualMix.org, a new platform designed to improve transparency and consistency in electricity attribute tracking through the publication of all known and reliable residual mix calculations.

Residual mix data is a fundamental component of reliable energy disclosure. It represents the portion of electricity that remains after all contractual claims, such as those made through Energy Attribute Certificates (EACs), have been accounted for, ensuring that the remaining, unclaimed attributes of electricity consumption are accurately reflected.

Advancing transparency in tracking systems

The ResidualMix.org is intended to address a long-standing challenge in the availability and accessibility of residual mix data. By providing clear, sourced, and comparable information, ResidualMix.org supports improved visibility of both national and global residual mixes.

The ResidualMix.org is maintained by the I-TRACK Foundation. The platform brings together residual mix calculations from multiple sources, including the I-TRACK Foundation methodology, the Association of Issuing Bodies (AIB) methodology, and other established approaches, enabling more consistent and transparent accounting across jurisdictions.

Greenhouse Gas (GHG) accounting and life-cycle assessment

Residual mixes play a critical role in greenhouse gas accounting, particularly for electricity consumption that is not matched with EACs or other recognised tracking instruments. The residual mix provides the appropriate emissions and energy source profile to be disclosed, ensuring that all electricity consumption is accounted for without double-counting.

By making this data accessible, the platform supports:

• Environmental and renewable energy claims.
• Centralized but referenced database of all known and reliable residual mix figures.
• Simplified scope 2 and carbon accounting by having a clear and reliable source of data.

From methodology to implementation

Differences in calculation approaches can lead to variations in results, making transparency and methodological clarity essential for accurate decision-making and reporting. By translating the regional methodologies into a unified and publicly available dataset and tool, ResidualMix.org will strengthen the robustness of electricity attribute tracking systems and support more reliable energy disclosure worldwide.

The I-TRACK Foundation welcomes this development as an important step toward increasing transparency, preventing double-counting, and reinforcing trust in renewable energy markets.