To calculate an Energy Use Intensity (EUI) score, all you really need is a few key pieces of information and some basic math skills. Sure, you’ll have to learn what a kBtu is, but it’s really not as complicated as you might think.
To understand what you EUI means—well, that’s what we’re here to discuss today. But first, let’s practice those basic math skills as we walk through a quick scenario.
So, you have a building and you may or may not want to know its EUI. You’re not really sure what an EUI is, but you’ve heard it can be a valuable metric. (This is true, by the way. More on that later.) Great. First order of business: Find out how much energy your building uses per year.
Got it? Now divide that number by your building’s total area. The resulting number is your EUI. That’s it.
So What Does My Energy Use Intensity Mean?
Unlike an ENERGY STAR score, which runs from 1-100, a lower EUI number generally represents better performance. Just like an ENERGY STAR score, however, you’ll be able to compare your building to others that are similar in age and size. It just won’t be in the form of a percentile ranking.
Some types of buildings will always have a lower EUI than others, as this chart from Energy.gov illustrates.
Some good news: At Energy.gov, Portfolio Manager will do all the math for you. So no matter which units you use to input your energy consumption and building area, you’ll be fine. At the end, Portfolio Manager will spit out a number expressed in kBtu/square feet.
(In plain English, a “kBtu” is one thousand British thermal units. So now you know, and it’s up to you to decide whether you’ll ever use that information again.)
But here’s the kicker: It’s possible to calculate an EUI for virtually any building. (That’s not the case with an ENERGY STAR score.) So if you’re taking the North Alabama Buildings Performance Challenge, calculating your building’s EUI could generate some seriously valuable energy-efficiency information for yourself and your company.
Even if your building doesn’t produce enough data for an ENERGY STAR score.
So basically, when you calculate your EUI, you’ll know how exactly how well you’re doing with your efficiency efforts. What’s more, you’ll be able to identify areas for improvement.
And most importantly, you’ll continue to make progress toward your overall goal of improving your building’s energy efficiency.