New Buildings Institute (NBI) has developed the first ever set of plug load energy use metrics, which will allow commercial building owners and managers to more easily gain insight into their buildings’ energy use and become more energy efficient. Earlier this year, PECI used the NBI metrics to assess plug load energy use at PECI headquarters in the First and Main building in downtown Portland, Oregon. The study, which informed an energy-saving campaign, resulted in an 18 percent kWh reduction of PECI’s plug load.
Review New Buildings Institute Metrics, “Methodology for Reporting Commercial Office Plug Load Energy Use” and PECI case study, “Analyzing Plug Loads.”
According to the Energy Information Agency, plug load – which is defined as electricity use by equipment that plugs into a building’s electrical outlets – is one of the fastest-growing sources of energy use in commercial buildings. In typical offices, 15 to 20 percent of energy use can be attributed to the plug load of computers, monitors, printers, desk lamps, telephones, etc. In buildings with HVAC and/or lighting systems that have been upgraded or improved to be more energy-efficient, plug load can reach as high as 50 percent of total energy use.
The intent of NBI’s new metrics is to set a benchmark for plug load energy use and make it easier for building owners and managers to spot opportunities to improve energy efficiency. The methodology allows an apples-to-apples comparison of plug load energy use across commercial buildings, even if they have vastly different plug load makeups and characteristics.
PECI helped NBI test the theories behind their metrics during a study conducted in the Portland offices of PECI. PECI’s LEED Platinum office is equipped with an energy management system that allows circuit-level monitoring of energy use throughout the office space. This fact, coupled with PECI’s commitment to the study, practice and influence of responsible energy management, made the site – and the pairing – ideal.
NBI’s metrics showed that PECI’s plug load performance during business hours was already quite good, with numbers comparable to the metrics’ lowest reference value. Overnight, however, PECI’s plug load rated more poorly, with values above the metrics’ median.
“We discovered our higher overnight plug load was primarily due to people leaving their computers in ‘sleep mode’ when they left the office for the day,” said Joan Effinger, Engineering Manager at PECI. “We were excited to use the findings as an opportunity to improve.” PECI launched an internal campaign to motivate people to completely shut off their computers at the end of the day, which contributed to an 18 percent kWh reduction of plug load.
“It was very valuable to conduct such a successful test in a real-world situation,” said Cathy Higgins, Research Director of NBI. “Hopefully this is the first of many cases when people use these new metrics to improve the performance of buildings and reduce energy and cost.”
[1] Plug loads are a part of what is known as Miscellaneous Electrical Loads (MELS)
About PECI
PECI is a nonprofit corporation dedicated to creating the new energy economy. We are leaders in the field of energy resource management, with expertise in designing and implementing energy efficiency programs for utility and government agency clients. Our work helps millions of residential, commercial and industrial utility customers reliably save energy and money. We were founded in 1979 in Portland, Oregon and currently work with clients nationwide. To learn more, visit www.peci.org.
About NBI
Established in 1997, New Buildings Institute (NBI) has been a driving force in advancing energy code stringency, most notably with the adoption of the 2012 International Energy Conservation Code (IECC), which was based largely on NBI's Core Performance Guide--a prescriptive approach to high performance commercial buildings. The organization also advocates for measuring building energy performance in occupancy rather than relying on modeled predictions to assess efficiency levels, and has become a clearinghouse on zero-net energy policies and practices. To learn more about NBI go towww.newbuildings.org or call 360.567.0950.
Related Stories
Office Buildings | Jan 19, 2024
How to strengthen office design as employees return to work
Adam James, AIA, Senior Architect, Design Collaborative, shares office design tips for the increasingly dynamic workplace.
Modular Building | Jan 19, 2024
Building with shipping containers not as eco-friendly as it seems
With millions of shipping containers lying empty at ports around the world, it may seem like repurposing them to construct buildings would be a clear environmental winner. The reality of building with shipping containers is complicated, though, and in many cases isn’t a net-positive for the environment, critics charge, according to a report by NPR's Chloe Veltman.
Adaptive Reuse | Jan 18, 2024
Coca-Cola packaging warehouse transformed into mixed-use complex
The 250,000-sf structure is located along a now defunct railroad line that forms the footprint for the city’s multi-phase Beltline pedestrian/bike path that will eventually loop around the city.
Sponsored | BD+C University Course | Jan 17, 2024
Waterproofing deep foundations for new construction
This continuing education course, by Walter P Moore's Amos Chan, P.E., BECxP, CxA+BE, covers design considerations for below-grade waterproofing for new construction, the types of below-grade systems available, and specific concerns associated with waterproofing deep foundations.
Sponsored | Performing Arts Centers | Jan 17, 2024
Performance-based facilities for performing arts boost the bottom line
A look at design trends for “budget-wise” performing arts facilities reveals ways in which well-planned and well-built facilities help performers and audiences get the most out of the arts. This continuing education course is worth 1.0 AIA learning unit.
Giants 400 | Jan 15, 2024
Top 130 Hospital Facility Architecture Firms for 2023
HKS, HDR, Stantec, CannonDesign, and Page Southerland Page top BD+C's ranking of the nation's largest hospital facility architecture and architecture engineering (AE) firms for 2023, as reported in the 2023 Giants 400 Report.
Airports | Jan 15, 2024
How to keep airports functional during construction
Gensler's aviation experts share new ideas about how to make the airport construction process better moving forward.
Adaptive Reuse | Jan 12, 2024
Office-to-residential conversions put pressure on curbside management and parking
With many office and commercial buildings being converted to residential use, two important issues—curbside management and parking—are sometimes not given their due attention. Cities need to assess how vehicle storage, bike and bus lanes, and drop-off zones in front of buildings may need to change because of office-to-residential conversions.
MFPRO+ News | Jan 12, 2024
As demand rises for EV chargers at multifamily housing properties, options and incentives multiply
As electric vehicle sales continue to increase, more renters are looking for apartments that offer charging options.
Student Housing | Jan 12, 2024
UC Berkeley uses shipping containers to block protestors of student housing project
The University of California at Berkeley took the drastic step of erecting a wall of shipping containers to keep protestors out of a site of a planned student housing complex. The $312 million project would provide badly needed housing at the site of People’s Park.