Abstract: This guide identifies the mechanisms and an analytic approach for developing consistent rules, agreements, and/or methodologies for the evaluation and inter-entity cooperation managing pole attachments on utility infrastructure that can contain both electric supply as well as communications wireline and wireless facilities.
The common safety codes and accepted good industry practices for joint use are referenced, including items such as clearances and strength/loading requirements, appropriate work rules during installation, maintenance and restoration, and general guidelines. The considerations within this guide can be used to help perform a detailed assessment of attachment installations where communications antennas and related wireline and wireless equipment are to be co-located on joint use structures.
Scope: This guide provides recommendations for the development of consistent guides, agreements, and/or methodologies for the evaluation and inter-company cooperation on managing pole attachments on Electric Utility infrastructure.
Purpose: The Joint Use Guide documents consistent approaches, methodologies and rules for the sharing and co-location of equipment with electric Transmission & Distribution (T&D) facilities for communications such as antennae and/or cable. With the emergence of new communications networks and emerging technologies which depend on widely distributed communications {e.g. 5G and Internet of Things ( IoT)}, the needs of vertical real-estate for use in communications is expected to dramatically increase in the coming years. While electric T&D facilities provide an excellent platform to help meet these needs, there are significant safety and reliability issues associated with their use.
The fourth edition of ASHRAE Standard 90.4 was published in late 2025 (superseding the 2022 edition) and it provides leading practice for smaller enterprise level data centers as well as hyperscale campuses.
Key Highlights of the 2025 Edition
Establishes minimum energy efficiency requirements for the design, construction, operation, and maintenance of data centers.
Expanded sustainability scope: Goes beyond pure energy efficiency to explicitly include greenhouse gas emissions, water use, and broader resource impacts.
Maintains the performance-based approach using metrics like the Mechanical Load Component (MLC) and Electrical Loss Component (ELC), with refinements to make requirements more stringent.
Applies primarily to data centers with power density >20 W/ft² and IT loads >10 kW. It references ASHRAE 90.1 for non-data-center elements (envelope, lighting, etc.).
This marks a clear evolution toward decarbonization and resource efficiency, especially important for AI-driven hyperscale data centers.
Recent Developments (2025–2026)
Addendum b to the 2022 edition was approved in September 2025, providing clarifications for phased or modular data center designs.
The 2024 IECC now references ASHRAE 90.4-2022 (Sections 6 and 8) as a compliance path for data centers.
ASHRAE continues to advocate for wider adoption of 90.4 in state and local energy codes.
The Standing Standard Project Committee (SSPC 90.4) remains active with working groups on mechanical, electrical, ESG, and marketing aspects.
Data centers are among the fastest-growing energy consumers globally due to AI, cloud computing, and digital infrastructure. ASHRAE 90.4 was created because traditional building codes do not adequately address their unique high-density, mission-critical nature.
The 2025 edition’s inclusion of emissions and water use reflects increasing industry and regulatory pressure on data center environmental footprints.
This title establishes minimum energy efficiency requirements for data centers; a permanent fixture in all education communities now undergoing a virtual +∞ asymptotic spike in generative intelligence transformation in ℝ³. At the moment this title is stable but can be revised in 30-90 day consultation cycles which will make it the dominant standard compared with IEEE and NFPA titles which move on a 3 to 5 year revision cadence.
ASHRAE 90.4 defines an alternate compliance path, specific to data centers, while the compliance requirements for “non-data center” components are contained in ASHRAE 90.1 . The 90.4 structure also streamlines the ongoing maintenance process as well ensures that Standards 90.1 and 90.4 stay in their respective lanes to avoid any overlap and redundancies relating to the technical and administrative boundaries. Updates to ASHRAE 90.1 will still include the alternate compliance path defined in ASHRAE 90.4. Conversely the 2022 Edition of 90.4-2022 refers to ASHRAE 90.1-2022; cross-referencing one another synchronously
Links to noteworthy coverage from expert agencies on the 2022 revisions:
This title resides on the standing agenda of our Infotech 400 colloquium; hosted several times per year and as close coupled with the annual meetings of ASHRAE International as possible. Technical committees generally meet during these meetings make decisions about the ASHRAE catalog. The next all committee conference will be hostedJanuary 20-24, 2024 in Chicago. As always we encourage education industry facility managers, energy conservation workgroups and sustainability professionals to participate directly in the ASHRAE consensus standard development process. It is one of the better facilities out there.
Proposed Addendum g makes changes to definitions were modified in section 3 and mandatory language in Section 6 to support the regulation of process heat and process ventilation was moved in the section for clarity. Other changes are added based on comments from the first public review including changes to informative notes.
Consultation closes June 4th
Update: February 10, 2023
The most actively managed consensus standard for data center energy supply operating in education communities (and most others) is not published by the IEEE but rather by ASHRAE International — ASHRAE 90.4 Energy Standard for Data Centers (2019). It is not required to be a free access title although anyone may participate in its development. It is copyrighted and ready for purchase but, for our purpose here, we need only examine its scope and purpose. A superceded version of 90.4 is available in the link below:
It is likely that the technical committee charged with updating this standard are already at work preparing an updated version that will supercede the 2019 Edition. CLICK HERE for a listing of Project Committee Interim Meetings.
We maintain many titles from the ASHRAE catalog on the standing agenda of our Mechanical, Energy 200/400, Data and Cloud teleconferences. See our CALENDAR for the next online meeting; open to everyone.
Originally posted Summer 2020.
ASHRAE International has released four new addenda to its energy conservation consensus document ASHRAE 90.4-2016 Energy Standard for Data Centers. This document establishes the minimum energy efficiency requirements of data centers for design and construction, for the creation of a plan for operation and maintenance and for utilization of on-site or off-site renewable energy resources.
It is a relatively new document more fully explained in an article published by ASHRAE in 2016 (Click here). The addenda described briefly:
Addendum a – clarifies existing requirements in Section 6.5 as well as introduce new provisions to encourage heat recovery within data centers.
Addendum b – clarifies existing requirements in Sections 6 and 11 and to provide guidance for taking credit for renewable energy systems.
Addendum d – a response to a Request for Interpretation on the 90.4 consideration of DieselRotary UPS Systems (DRUPS) and the corresponding accounting of these systems in the Electrical Loss Component (ELC). In crafting the IC, the committee also identified several marginal changes to 90.4 definitions and passages in Section 8 that would add further clarity to the issue. This addendum contains the proposed changes for that aim as well as other minor changes to correct spelling or text errors, incorporate the latest ELC values into Section 11, and to refresh information in the Normative Reference.
Addendum e adds language to Section 11 intended to clarify how compliance with Standard 90.4 can be achieved through the use of shared systems.
Comments are due September 6th. Until this deadline you may review the changes and comment upon them by by CLICKING HERE
Education facility managers, energy conservation workgroups and sustainability professionals are encouraged to participate directly in the ASHRAE standard development process. Start at ASHRAE’s public commenting facility:
The ASHRAE catalog is a priority title in our practice. This title appears on the standing agenda of our Infotech sessions. See our CALENDAR for the next online meeting; open to everyone.
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Open every day since 2007: offering locally sourced coffee, teas, baked goods, and a welcoming space for studying or events. Across Linden Street from First Presbyterian Church of Ann Arbor, Angell Elementary School and footsteps away from Chi Omega and seven other sororities and fraternity houses on the oddly-shaped lot bounded by South University. Washtenaw and Hill Streets.
The University Lutheran Chapel in Ann Arbor, Michigan was designed by architect Glen Paulsen in 1959; a local Ann Arbor architect known for his modernist work and close ties to the University of Michigan community. The chapel is one of his most celebrated designs and is widely regarded as an outstanding example of mid-20th-century ecclesiastical architecture in the Midwest. The dramatic hyperbolic-paraboloid roof and the integration of natural light through colored glass strips are signature elements of the building.
His work often emphasized clean lines, structural expression (e.g., exposed concrete and steel), and integration with natural surroundings, influenced by his time with Eero Saarinen and his teaching roles at the University of Michigan and Cranbrook Academy of Art. While the University Lutheran Chapel (1959) in Ann Arbor exemplifies his ecclesiastical modernism with its hyperbolic-paraboloid roof, below is a curated list of his other key projects, drawn from biographical records, architectural archives, and historical surveys. In the fullness of time his private practice from 1958 to 1969 morphed into TMP (Tarapata-MacMahon-Paulsen, 1969–1977).
The University Lutheran Chapel in Ann Arbor, Michigan was designed by architect Glen Paulsen in 1959; a local Ann Arbor architect known for his modernist work and close ties to the University of Michigan community. The chapel is one of his most celebrated designs and is widely regarded as an outstanding example of mid-20th-century ecclesiastical architecture in the Midwest. The dramatic hyperbolic-paraboloid roof and the integration of natural light through colored glass strips are signature elements of the building.
His work often emphasized clean lines, structural expression (e.g., exposed concrete and steel), and integration with natural surroundings, influenced by his time with Eero Saarinen and his teaching roles at the University of Michigan and Cranbrook Academy of Art. While the University Lutheran Chapel (1959) in Ann Arbor exemplifies his ecclesiastical modernism with its hyperbolic-paraboloid roof, below is a curated list of his other key projects, drawn from biographical records, architectural archives, and historical surveys. In the fullness of time his private practice from 1958 to 1969 morphed into TMP (Tarapata-MacMahon-Paulsen, 1969–1977).
The key standards distinguishing building renovations (alterations, repairs, or rehabilitation) from new building construction primarily come from the model code stacks of the International Code Council, the National Fire Protection Association, ASHRAE International, Institute of Electrical and Electronic Engineers and the embedded product standards by ASTM International, Underwriters Laboratories and others we track routinely.
There are others, notably the FEMA “50 percent” rule informed by National Flood Insurance Program regulation applying to buildings in flood-prone areas. It governs renovation, repair, and improvement projects by defining “substantial improvement” or “substantial damage” as any work where costs equal or exceed 50% of the structure’s pre-improvement (or pre-damage) market value (excluding land value).
The “50 percent” rule does not exist in the Americans with Disabilities Act (ADA) regulations in the same way as FEMA’s flood-related 50% threshold for substantial improvement/damage. Instead, ADA alterations (under Title III for public accommodations and commercial facilities, and Title II for public entities) use a 20% disproportionate cost threshold for certain requirements.
Sustainability objectives also shape the
scope of building renovation projects by expanding beyond basic repairs or cosmetic updates to encompass holistic, long-term performance improvements across environmental, economic, and social dimensions.
Today at the usual hour we will scan stabilized standards and track changes in process where possible. Use the login credentials at the upper right of our home page.
Chartered in 1876, and having outgrown its home by the early 1900s, its alumni hired Detroit architect Albert Kahn for his earliest surviving non-industrial, non-commercial commissions. Kahn created a handsome 2½-story Tudor Revival building with half-timbered stucco exterior, slate roof, prominent gables. It pioneered the shift of fraternities to Hill Street, inspiring many others to follow. The house has been continuously occupied by the fraternity since completion—the oldest such in Ann Arbor. It earned National Register of Historic Places listing in 1995.
The Bachelor of Science in Family and Consumer Sciences at Colorado State University prepares students to enhance individual, family, and community well-being through an interdisciplinary curriculum. The program offers two concentrations: Family and Consumer Sciences Education and Interdisciplinary FCS. The Education concentration trains students to become licensed middle or high school teachers, meeting Colorado’s teaching licensure requirements and boasting high job placement rates.
The Interdisciplinary concentration provides a broad foundation for careers in areas like counseling, advocacy, or community services, focusing on skills such as resource management, nutrition, and interpersonal relationships. Students engage in hands-on learning, including internships and student teaching, and benefit from nationally recognized faculty and professional development opportunities. The curriculum covers topics like personal finance, family systems, and wellness, equipping graduates to address real-world challenges. CSU’s program is accredited by the American Association of Family and Consumer Sciences, and students can pursue certification through the same organization.
“One of the Family” 1880 | Frederick George Cotman
With a focus on leadership and civic engagement, the FCS degree ensures graduates are ready to make meaningful societal impacts. Scholarships and flexible online options are available, enhancing accessibility.
Neil Brown Jr. married his prom date—they’ve been together for 30 years, married for 25, and have two sons. True high school sweethearts, now in their mid-40s. Get them on a marriage podcast! They fully embraced the idea that marrying early is leveling up not “settling down.” pic.twitter.com/HAnagFEaHA
New update alert! The 2022 update to the Trademark Assignment Dataset is now available online. Find 1.29 million trademark assignments, involving 2.28 million unique trademark properties issued by the USPTO between March 1952 and January 2023: https://t.co/njrDAbSpwBpic.twitter.com/GkAXrHoQ9T
