Preliminary Energy Assessments

The Preliminary Energy Assessment (PEA) collects and analyzes data for a cost-benefit benefit analysis to ascertain the cost effectiveness each energy efficiency measure (EEM) that the engineers felt showed promise in the initial Screening Audit.

In many cases, it is used to identify for further evaluation EEMs that appear to be cost-effective, and to determine whether an In-depth Feasibility Study is required.

Through the PEA process we estimate EEM implementation costs and possible energy savings and identify the EEM simple payback period. The PEA report includes high-level cost-benefit analyses of selected EEMs.

• The calculations include current and future energy use for two or more options, compares the options and finds the kWh savings per year.

• It also identifies implementation costs for the new, replacement equipment. The implementation budget and energy costs savings are used to determine simple payback (in years) for each EEM. Actual data or assumed data (or both) are used for the calculations. Assumed data is based on actual data used from other similar facilities.

In a PEA the EEM energy savings are normally quantified based on high-level energy evaluations through the use of one of the following methods:

• Computer programs with minimum data input.

• Industry standard percentage savings.

• In some cases, through the use of energy simulation programs. (These use some actual and assumed data to satisfy the program data requirements).

In a PEA, the EEM implementation costs are usually established based on high-level cost evaluations, such as:

• Previous studies and calculated dollars per square foot.

• Actual equipment cost plus a percentage to cover all other associated costs.

• In some cases, through the use of an implementation budget software program using typical hardware requirements (such as, pipe sizes and number of feet of pipe, number of manual and automatic valves, etc.).

The results from the EEM evaluations are presented in the PEA report for management’s review and for a future In-depth Feasibility Study if appropriate.