Technical Reference Library

Welcome to the Massachusetts Technical Reference Library (TRL). The TRL is an electronic database that allows regulators, government agencies, stakeholders, and the public to access reports that provide methods, formulas, and default assumptions for estimating energy, peak demand, and other resource impacts from energy efficiency measures. The TRL documents how the energy efficiency Program Administrators consistently, reliably, and transparently calculate savings resulting from the installation of prescriptive energy efficiency measures. For more information on the TRL, update process, measure characterization structure, impact factors and formulas, and glossary, please see the TRL Overview.

To access the TRL, please use the following link, username, and password:


For assistance in utilizing the TRL, please see the TRL Reference Guide.

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