Reviews the concept of peak demand charges on electrical utility bills and provides analysis of the effect of cool or highly reflective roofs in reducing peak demand charges.
After reading this article, you should be able to:
1. Understand the difference between net usage and peak demand charges and the role each plays in your electric bill. Using examples of typical electrical bills, learn how to identify and separate these two charges.
2. Understand how peak demand charges are affected by thermal loads on your building and, most importantly, the roof on your building. Recognize the key types of thermal loads that have the greatest influence on peak demand charges.
3. Understand how cool roof surfaces can be used to reduce peak demand – and related peak demand charges – in almost any climate.
4. Learn to estimate potential peak demand charge savings for different roof systems using the free online “Cool Roof Peak Calculator” developed by the U.S. Department of Energy and Oak Ridge National Labs.