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
| Apr 2, 2012
Gilbane honored for sustainability efforts in Indianapolis
Emmitt J. Bean Federal Center project team for their role in advancing sustainability in the city.
| Apr 2, 2012
Mitsubishi unveils ultra-high-speed elevator for Shanghai skyscraper
The operation of the elevator is scheduled to begin in 2014.
| Apr 2, 2012
Sachse Construction helps complete Salt Lake City’s City Creek Center
Sachse was hired to complete store build-outs at City Creek Center.
| Apr 2, 2012
Culver joins Sasaki as managing director
Culver will work closely with Sasaki firm leaders on issues of strategy, marketing, and business development.
| Apr 2, 2012
EB-5 investment funds new Miramar, Fla. business complex
Riviera Point Holdings breaks ground on $17 million office center.
| Mar 30, 2012
New windows and doors revitalize older buildings
With their improved aesthetics, energy efficiency, and durability, replacement windows and doors can add significant value to a renovation project.
| Mar 30, 2012
18 handy tablet apps for AEC professionals
Check out these helpful apps for everyday design and construction tasks. Our favorite: MagicPlan, which uses GPS to help you measure and draw a floor plan of any room.
| Mar 29, 2012
U.K.’s Manchester Airport tower constructed in nine days
Time-lapse video shows construction workers on the jobsite for 222 continuous hours.
| Mar 29, 2012
Roller shade operating system wins IF Product Design Award
Design experts in the iF jury recognized the engineering invested in the RB 500 Roller Shade, including a metal clutch with a patented construction, a durable zamac housing with polished finish, and a chain drive unit that excels in maximum operating comfort.
| Mar 29, 2012
Lehigh engineering student wins Thornton Tomasetti Foundation Awards Scholarship
The scholarship is awarded annually to a graduate student in structural engineering deemed by the department to have the potential to make an impact in the field professionally.