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
| Mar 27, 2012
Precast concrete used for affordable, sustainable housing in New York
Largest affordable housing development in the nation will provide housing for close to 500,000 people.
| Mar 27, 2012
Groundbreaking held for Valencia College West Campus Building 10 in Orlando
Project led by design-build team of SchenkelShultz Architecture and McCree General Contractors, both of Orlando.
| Mar 27, 2012
Hollister Construction completes LEED Silver bank in Woodland Park, N.J.
Ground-up construction project included installation of solar panels.
| Mar 26, 2012
Jones Lang LaSalle completes construction of $536M Parkview Regional Medical Center
Hospital ushers in new era of local access to advanced medical treatments in Northeast Indiana.
| Mar 26, 2012
McCarthy tops off Math and Science Building at San Diego Mesa College
Designed by Architects | Delawie Wilkes Rodrigues Barker, the new San Diego Mesa College Math and Science Building will provide new educational space for students pursuing degree and certificate programs in biology, chemistry, physical sciences and mathematics.
| Mar 26, 2012
Los Angeles County to host free green building training
Opportunity for residential and commercial building professionals to gain insight on state and county green building standards and regulations.
| Mar 26, 2012
Ball State University completes nation's largest ground-source geothermal system
Ball State's geothermal system will replace four aging coal-fired boilers to provide renewable power that will heat and cool 47 university buildings, representing 5.5-million-sf on the 660-acre campus.
| Mar 22, 2012
Hawaiian architecture firm chooses FRP trellis system over traditional materials
MGA Architecture plans to add five more trellis systems on the neighboring building.
| Mar 22, 2012
Moline Public Library uses copper as an exterior building material
Architects incorporate decorative copper panels to create the look of a heavy plate copper shingle.
| Mar 21, 2012
10 common data center surprises
Technologies and best practices provide path for better preparation.
