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
| Dec 8, 2011
Keast & Hood Co. part of Statue of Liberty renovation team
Keast & Hood Co., is the structural engineer-of-record for the year-long $27.25 million renovation of the Statue of Liberty.
| Dec 8, 2011
HDR opens office in Shanghai
The office, located in the Chong Hing Finance Center in Shanghai’s busy Huangpu District, will support HDR’s design efforts throughout Asia.
| Dec 8, 2011
HOK elevates the green office standard
Firm achieves LEED Platinum certification in New York office that overlooks Bryant Park.
| Dec 7, 2011
ACE Mentor Program receives Presidential Award for Excellence in Science, Math and Engineering Mentoring
Thornton Tomasetti founding principal Charles H. Thornton responsible for launching ACE.
| Dec 7, 2011
NSF International qualifies first wallcoverings distributor to the New American National Standard for Sustainable Wallcoverings
TRI-KES demonstrates leadership in environmental stewardship as the first distributor to earn qualification.
| Dec 7, 2011
DPR Foundation awards $590,000 to youth organizations
Grants will fund programs for disadvantaged kids across six states.
| Dec 7, 2011
Autodesk agrees to acquire Horizontal Systems
Acquisition extends and accelerates cloud-based BIM solutions for collaboration, data, and lifecycle management.
| Dec 7, 2011
ICS Builders and BKSK Architects complete St. Hilda’s House in Manhattan
The facility's design highlights the inherent link between environmental consciousness and religious reverence.
| Dec 6, 2011
Construction industry leaders gather for forum on diversity
Declared a “groundbreaking” event for the industry, Gilbane’s First Annual National Partners Council Forum addressed diversity and inclusion as well as building partnerships with minority, veteran, and women-owned businesses.
| Dec 6, 2011
Mortenson Construction completes Elk Wind Project in Iowa
By the end of 2011, Mortenson will have built 17 wind projects in the state generating a total of 1894 megawatts of renewable power.
