The EPRG lifts the lid on the long-standing dispute between engineers and economists. Who knows best and whose contributions should be used to solve the problems of energy usage in the UK today? We look for the middle ground between the two. Audience participation though interactive voting is encouraged. This is a panel discussion by EPRG researchers with invited guests to discuss the long-standing dispute over who knows best when it comes to advising policymakers on energy policy: Engineers or Economists?