Existing Building Energy Consumption: Current Situations, Trends, Legislature and Solutions (Series Post #3: Benchmarking)

In my last blog, I provided an overview of the energy audit process. I highlighted the importance of energy audits and want to further this discussion by exploring the topic of benchmarking. Due to rising energy cost and the negative impact of burning fossil fuels, legislators have been demanding, in addition to energy audits, benchmarking. The benchmarking process creates a baseline of comparison for buildings in order to accurately set energy performance/sustainability goals that are specific to your facility, such as reducing overall energy or water usage.

What is Benchmarking?
Benchmarking your building’s performance will show you how the energy performance of your building compares to other, similar buildings. This process involves tracking a building’s energy and water usage and applying a standard metric to compare the building’s performance against past performance and to buildings of similar stature. This information allows us to identify the energy intensive buildings, set energy and cost saving priorities and monitor progress.

Benchmarking in Legislation.
With cities growing at alarming rates, energy demands are skyrocketing. NYC has stepped up to the challenge and is a proven frontrunner for energy legislation, including benchmarking. New York City’s largest buildings, just 2% of roughly 1 million buildings, account for 45% of the energy expended. Building a better, greener, greater New York City starts with Local Law 84 (LL84); which was signed into action in 2009 by Mayor Bloomberg. This law mandates annual energy and water benchmark reports for privately owned buildings over 50,000 square feet. Since the enactment of LL84, California and Washington State have instituted statewide requirements for benchmarking in cities such as: Austin; Philadelphia; Washington, D.C.; Minneapolis and Boston. Cities across the United States are jumping on the benchmarking movement every day in a fight to reduce buildings’ energy consumption.

Problems with Benchmarking.
Building owners and operators often do not have access to basic information on how their building performs. If building owners and operators obtain this information, it can be difficult to interpret it accurately. Misinterpreting the numbers can be very misleading. Another difficulty is comparing your building to other “similar” buildings. Do you compare your building against one of similar size, but the building use is different? Factors such as facility size and occupancy information, vacancy data and number of computers used can all manipulate data. How can one make an accurate comparison?

Suggestions.
The key to accurate benchmarking is the activities of the end users. Another key factor is communication. Facilities operators and owners must clearly articulate the goals of benchmarking their building, so that intentions are understood from the start. There are several motivations behind benchmarking, the main reasons given by facilities professionals for benchmarking according to the Lawrence Berkeley National Laboratory study in 2007 are as follows: a) to identify energy-efficiency opportunities, b) to prioritize investments, and c) to make comparisons to other facilities.

Data presentation should explain findings clearly; what you were investigating and what you found. Once you have your benchmarking data, it will help to identify why and where a building is losing energy and where and how you can save energy. A tool that can help includes the newly upgraded EPA Energy Star Portfolio Manager Benchmarking Tool. Read about it here.

What Type of Energy Audit Will Produce Accurate Benchmarking Data?
In my next blog post, I will discuss the building technology society founded in 1894 known as the American Society of Heating, Refrigerating and Air Conditioning Engineers (ASHRAE). This professional association focuses on building systems, energy efficiency, indoor air quality, refrigeration and sustainability within the industry. I will explore what ASHRAE’s standards and guidelines are for energy auditing in my next post.

Do you have any questions regarding benchmarking? Leave me a comment and I’ll be sure to address them.

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3 Comments

Filed under Building efficiency, Energy, energy audit, energy consumption, energy efficiency, energy monitoring, energy usage, EPA

3 responses to “Existing Building Energy Consumption: Current Situations, Trends, Legislature and Solutions (Series Post #3: Benchmarking)

  1. Mark Wills

    When do you anticipate your next post (re: ASHRAE programs) will go online? Thanks.

    • Hello Mark: I post something new every other Thursday. So my next post will be published on August 29th. I plan to discuss an introduction to ASHRAE and how their guidelines are used in Local Law 87. Is there a particular ASHRAE program you would like me to discuss? I’d be more than happy to address any questions you have. Thank you for the comment!

  2. Now that’s some information on Ll84. Thank you for detailed information.

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