This report identifies ten significant design issues for energy efficiency potential studies, which are often mishandled, leading to flawed study results. Potential studies are nearly always expensive and time consuming undertakings. It is therefore important to “get it right” the first time. This report provides guidance to regulators and stakeholders to help ensure that any new potential study will avoid mishandling the identified issues and will meet the study’s stated objectives. However, an already completed potential study may have succumbed to one or more of the pitfalls identified in this report. Rather than initiate a new, expensive, and time consuming study, this report also provides guidance on how results from a flawed previous study can be re-interpreted to be more useful.