Models from Cornerstone
CEDA
CEDA is Watershed's Multi-Region Input Output Model, first released in 2001 and built primarily for the professional use case over the last two decades.
Updated March 8, 2026
US EEIO
USEEIO is the United States Environmentally-Extended Input-Output family of models that underpins the supply chain emission factors, originally developed by the US Environmental Protection Agency (EPA) and maintained by Cornerstone moving forward. This dataset covers 411 sectors for the United States.
Updated March 8, 2026
Emissions Factor Hub
The EF Hub consolidates key United States data sources—including eGRID and the Waste Reduction Model (WARM)—into a single, easy-to-use set of emission factors. The last version of the EF Hub was released in January, 2025 by the US EPA. Cornerstone will continue maintenance and development moving forward.
Updated March 8, 2026
eGRID
The Emissions & Generation Resource Integrated Database (eGRID) is the most up-to-date, regionally-specific and comprehensive view of electricity generation in the United States. The last version of eGRID (2023) was released in January, 2025 by the US EPA. Cornerstone released eGRID 2024 and will continue to update moving forward.
Updated March 8, 2026
Roadmap and Contributing
Currently, the Cornerstone team is working on:
- Harmonizing the U.S. modeling approach between USEEIO and CEDA
- Updating U.S. state models with the latest environmental and economic data
- Developing our roadmap for eGRID 2025 and the 2027 Hub
- Engaging and seeking feedback from the broader community of industrial ecologists and input-output modelers
As part of our mission, we work as much as possible in the open. We welcome input in the form of issues, discussions, and pull requests on Github.
Updates
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