Compliance users

In the California cap-and-trade program, polluting entities use carbon offsets for compliance. Who are they? This tool lets you search for an offset project, user, or facility, and see the linked results. Read more in our blog post or checkout the GitHub repository.

Tracking the users of compliance offsets

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This tool is designed to make public cap-and-trade data about offset use more easily accessible. It connects the dots between various data sources, and makes it possible to answer questions about how offset projects, regulated entities, and emitting facilities are connected.

Specifically, the underlying data allows us to ask who has used credits from a particular offset project (project → users), which offset projects a particular regulated entity has turned in credits from (user → projects), and which emitting facilities are associated with a regulated entity (user → facilities). Note that while both offset projects and facilities can be connected to a user, the structure of the underlying data does not allow facilities and projects to be directly associated with each other.

Additional information about forest projects in particular — including total issuance and overlap with wildfire — can be found in our public forest offsets project database.

You can cite this work as:

F Chay, J Freeman, D Cullenward (2021) “Compliance users” CarbonPlan doi:10.5281/zenodo.5819475


The California Air Resources Board (CARB) — the regulator in charge of implementing the cap-and-trade program — publishes a variety of cap-and-trade data. This tool connects the dots between three of CARB’s published data sources. Here we describe those sources.

Compliance reports are published at the end of each compliance period (2013-2014, 2015-2017, and 2018-2020) and detail how regulated entities comply with their cap-and-trade obligations, including through use of offset credits. We use the compliance reports to associate regulated entities (i.e. users) with offset project IDs and facility IDs.

Mandatory GHG Reporting Data (MRR) are published annually (2013-2020) and provide information on emitting facilities. Some of these emissions are “covered” by cap-and-trade, and therefore form the basis for a compliance obligation. We use the MRR data to connect facility IDs to facility names, types, and locations. A ** next to the name of a facility indicates a facility that appears in the MRR data, and is listed in the compliance reports, but in a different reporting period.

The Offset Credit Issuance Table provides information about the issuance of offset credits that are eligible for use in the cap-and-trade program. We use the Issuance Table to connect an offset project ID to project names, types, and locations.

CarbonPlan is a registered non-profit public benefit corporation in California with 501(c)(3) status.