About Gilleran Energy Management, Inc.


Gilleran Energy Management, Inc. (GEM) is an energy and green building project management firm that supports the design and construction team’s efforts to achieve a client’s energy efficiency and sustainability goals, on time and budget.

Located in Santa Rosa, California, we serve commercial clients, affordable housing developers, homeowners and municipalities throughout the North Bay and California since 2002. Our consultants provide green building, energy efficiency and renewable energy consulting to meet our client’s project development goals for new building designs and renovations.

GEM’s team of certified professionals offer comprehensive project development support for green building programs, energy efficiency, auditing, municipality greenhouse gas planning support, commissioning and renewable and efficiency project analysis, third-party verification and reporting.

Contact our team of energy consultants to maximize your energy savings potential.

Meet the Team


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Latest Updates

NEW Energy Code Effective January 01, 2023!

July 14, 2022

The 2022 Energy Code now classifies the following as single-family residential buildings: single-family dwellings, duplexes, townhomes of any size, and accessory dwelling units. Low-rise and high-rise multifamily buildings have also been reorganized into one building type and multifamily building requirements have been moved to their own subchapters.

What’s Changed with the 2022 Energy Code?