The Midwest Renewable Energy Tracking System (M-RETS) is a web-based system used by power generators, utilities, marketers, and qualified reporting entities in participating states and provinces.  M-RETS tracks Renewable Energy Certificates (RECs) and facilitates REC transactions by issuing a unique, traceable digital certificate for every megawatt-hour (MWh) of renewable energy generated by registered units or imported into its system.  M-RETS users retire RECs to comply with state policy or to serve the voluntary market and to ensure that RECs are not double-counted.

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The M-RETS® system is administered by APX which was awarded a contract by Midwest Renewable Energy Tracking System, Inc., a 501(c)4 non-profit, to operate and administer the program.