Chattanooga, TN: Energy performance

Energy Performance
Cumulative (vs. Baseline)25%
Annual (2019)8%

Better Buildings Challenge Partners strive to decrease portfolio-wide source energy use intensity (EUI) and to increase the percent improvement compared to a set baseline. The City of Chattanooga's portfolio consists of more than 128 buildings covering 2 million square feet . Since 2013, Chattanooga has improved energy performance by 25% in buildings. Building energy savings have been achieved by implementing a retrocommissioning program and upgrading the HVAC controls at the City Hall campus, recreation centers, and other larger city buildings to allow remote scheduling and management of the building systems. Building on the early success of the retrocommissioning program, the city is currently making strategic improvements to building systems including LED lighting and lighting controls which will impact more than 60 municipal facilities and stands to move them well along to their goal for energy use reduction. The City's Showcase Project, the downtown Public Library, has completed the replacement of over 800 fluorescent bulbs with just over 100 LED lights, and is on track to begin replacement of a 40-year HVAC system in the spring of 2020. Further, the City has recently broken ground on the construction of a 4 megawatt photovoltaic (PV) solar array at the municipally owned and operated Moccasin Bend Wastewater Treatment Plant. It is anticipated that the array will offset more than 11 percent (%) of the plant's annual energy consumption with all power being directly applied to plant operations behind the meter.


Looking at the percent improvement in energy performance across all buildings can provide insight into how an organization is saving energy.  The City of Chattanooga has achieved energy performance improvement of greater than 15% at more than 47 of its buildings with several of the city's properties experiencing even greater energy performance improvements. Although at this early stage, there are 16 buildings that have experienced an increase in Source EUI, armed with the key performance metrics provided through utility monitoring in Portfolio Manager, the city is able to shift its focus on strategic improvements to the lowest performing properties that will result in the greatest energy performance payback for the capital invested.


Property-level energy performance metrics, including EUI and percent improvement to date, are critical to track progress over time and identify opportunities for additional energy savings. Chattanooga's building portfolio consists of a wide range of property-types which results in a portfolio with a wide range of baseline EUI values. While the majority of the city of Chattanooga buildings have shown energy improvement since the baseline of 2013, the properties located near or below the 0% axis may indicate properties that present good opportunities for further improvement in energy performance and savings.