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
Multifamily Housing | Feb 9, 2015
GSEs and their lenders were active on the multifamily front in 2014
Fannie Mae and Freddie Mac securitized more than $57 billion for 850,000-plus units.
BIM and Information Technology | Feb 8, 2015
BIM for safety: How to use BIM/VDC tools to prevent injuries on the job site
Gilbane, Southland Industries, Tocci, and Turner are among the firms to incorporate advanced 4D BIM safety assessment and planning on projects.
Museums | Feb 6, 2015
Tacoma Art Museum's new wing features sun screens that operate like railroad box car doors
The 16-foot-tall screens, operated by a hand wheel, roll like box car doors across the façade and interlace with a set of fixed screens.
Office Buildings | Feb 6, 2015
6 factors steering workplace design at financial services firms
Grossly underutilized space and a lack of a mobility strategy are among the trends identified by HOK based on its research of 11 top-tier financial services firms.
Cultural Facilities | Feb 6, 2015
Architects look to ‘activate’ vacant block in San Diego with shipping container-based park
A team of alumni from the NewSchool of Architecture and Design in San Diego has taken over a 28,500-sf empty city block in that metro to create what they hope will be a revenue-generating urban park.
Multifamily Housing | Feb 6, 2015
Fannie Mae to offer lower interest rates to LEED-certified multifamily properties
For certified properties, Fannie Mae is now granting a 10 basis point reduction in the interest rate of a multifamily refinance, acquisition, or supplemental mortgage loan.
Airports | Feb 6, 2015
Zaha Hadid-designed terminal in Beijing will be world’s largest
The terminal will accommodate 45 million passengers per year, and will be a hub for both air and rail travel.
Codes and Standards | Feb 6, 2015
Obama executive order requires federal construction projects to consider flood damage caused by climate change
To meet the new standard, builders must build two feet above the currently projected elevation for 100-year floods for most projects.
HVAC | Feb 6, 2015
ASHRAE, REHVA publish guide to chilled beam systems
The guide provides tools and advice for designing, commissioning, and operating chilled-beam systems.
Cultural Facilities | Feb 6, 2015
Under the sea: Manmade island functions as artificial reef
The proposed island would allow visitors to view the enormous faux-reef and its accompanying marine life from the water’s surface to its depths, functioning as an educational center and marine life reserve.
