The Regulatory Assistance Project (RAP) was asked by the US Department of Energy (DOE) to develop and implement a deep dive into a state within the US, creating an in-depth work stream to better inform policymakers on utility program designs and regulatory policies that improve end-use energy efficiency. To that end, RAP selected the state of Arkansas for its deep dive after a thorough screening process. This report includes a discussion of the selection process, work stream and accomplishments, lessons learned, and recommendations for using this deep dive model in other jurisdictions.