Gilleran Energy Management, Inc.

Gilleran Energy Management, Inc. (GEM) is a leading energy efficiency consulting and green building firm based in Santa Rosa, California. Since 2002, we specialize in providing proactive, solutions-focused consulting for energy efficiency, compliance, and project management across California and beyond. We support commercial properties, affordable housing developments, homeowners, wineries, schools, and public agencies, helping them achieve sustainability goals and reduce operational costs.

GEM’s team of certified professionals offers comprehensive services including green building programs, energy audits, building commissioning, and renewable energy project analysis. We continuously monitor updates to Title 24, CALGreen, and other green building programs to deliver practical and forward-thinking solutions. At Gilleran Energy Management, we’re committed to clarity, collaboration, and long-term value, partnering with architects, developers, and builders to ensure projects meet code requirements and support sustainable objectives.