Step 2.3.5 Analyze and track significant energy uses
Significant energy uses are a “
key characteristic
” of energy performance that are regularly monitored, measured and analyzed. Once the significant energy uses are identified, energy consumption and output data is collected to determine their performance. A best practice is to include their energy performance data and information within the energy tracking system. This brings all of the organization’s energy data into one central location. Normal analysis and tracking of energy data will then include updating energy performance on the significant energy uses.
Data analysis is a continuous process. Data is initially collected and analyzed to determine the significant energy uses but then is continually collected, analyzed and tracked to identify opportunities for energy performance improvement. Including the energy performance data within the energy tracking system allows for easier data analysis.
Because significant energy uses account for a major portion of an organization’s energy consumption, analysis and projection of their future energy consumption is an important part of energy planning. To assist with projecting energy consumption of significant uses, an SEU Future Energy Estimate Worksheet is available. One estimate is completed for each significant use. Potential changes in SEU consumption can be developed based on the effects of production, capital investment, replacement energy sources, and completion of energy saving procedures.
Other miscellaneous factors are also considered including new technologies, process changes, materials changes, products, weather or operational criteria, and changes to the general economy or a specific sector of industry. Development of a future energy consumption estimate for SEUs will provide an early warning about anticipated changes occurring in an organization (See Step 6.1).
An
energy performance indicator
 or EnPI (see Step 2.6) is developed to define the energy performance for a significant energy use. There are generally accepted EnPIs for many common energy systems that may be significant energy uses in many organizations. Similar EnPIs can be developed for equipment, processes, facilities and personnel. Tracking the EnPIs will reveal trends that allow comparison of the performance of significant energy uses over time.
Benchmarking
 can be used, when available, to compare your significant energy use to the best in class or theoretically optimal performance of similar users.
An example of EnPI tracking for steel melt furnace energy performance is included. The example presents furnace performance expressed as kWh/ton for two shifts over a three week period. The example illustrates how EnPIs can be used to track significant energy use performance over time and how operating personnel can have an impact on significant energy use performance.