Chapter 17 — GEOTHERMAL ENERGY SYSTEMS AND AMBIENT TEMPERATURE LOOPS
1717.2 District Load Profiles — 2025 California Mechanical Code
California Mechanical Code (Title 24, Part 4) · 2025 edition · updated 2026-09-25 · California
CBSC: official editions, supplements and errata
Italicized text is a California amendment to the model code, as printed in the official publication.
Cite as: 2025 California Mechanical Code (Title 24, Part 4) § 1717.2 · Effective January 1, 2026 · Official source: Building Standards Commission
The district load profile of an ambient temperature loop (ATL) distributed energy system shall be identified and shall be included in the basis-of-design (BOD).
1717.2.1 System Asset Identification. System assets shall be listed and included in the system design. The system asset shall include, but not be limited to, the following:
(1) Building type and quantity.
(2) Natural or constructed sources and sinks such as ground water, boreholes, etc.
(3) Other renewable assets.
(4) Wasted heat recovery.
(5) Potable and non-potable water or fluid sources.
(6) Conventional assets such as boilers and cooling tow ers.
(7) Other GeoMicroDistrict or thermal highway.
1717.2.2 Driver Building. The driver building profile shall be identified in an ATL distributed energy system and shall be reported in the design documents.
1717.2.3 Diversity Factor. The diversity factor and/or anticipated wasted energy recovery component of the GeoMicroDistrict shall be identified by the designer and this information shall be included in the drawings and specifications.
358 2025 CALIFORNIA MECHANICAL CODE
CALIFORNIA MECHANICAL CODE – MATRIX ADOPTION TABLE
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