Before determining the EnPIs needed to adequately monitor and measure energy and
operational performance, you first need to determine the scope of each metric. Are you
attempting to track and manage performance at the plant, area, line, or machine level?
You need to determine what business questions you are trying to answer and determine
exactly what data points are needed to formulate the EnPIs to answer those questions.
The more comprehensive your plan to track energy within your facilities, the more
attention you will need to pay to systems, energy, and heat flows. This is especially true if
the products (outputs) of one process become feedstock or energy supplies (inputs) to
other processes. The simple way to think about this is to take an “outside-in approach.”
First, “draw a circle” around your plant and determine which EnPIs and underlying data
will be needed to track energy performance at the plant-wide level, whether comparing
this site to its peers or simply trying to show time series improvement in the plant. This
methodology should be repeated at successively deeper levels within the plant until you
have reached the desired level of granularity (e.g., area, unit, line, or equipment levels)
(see Figure 27.1).
There are two approaches to planning and selecting the set of EnPIs and underlying
measurements that will satisfy your business needs while balancing the practical need to