The path to achieving meaningful decarbonization is intricate and multi-layered, especially for sectors like utilities that have high emissions and complex supply chains. While Scope 1 and 2 emissions serve as critical starting points, the conversation in sustainability is rapidly expanding to encompass Scope 3 and, more recently, Scope 4 emissions. These two concepts, often misunderstood or overlooked, are pivotal in shaping a holistic decarbonization strategy. This guide will provide an in-depth look at Scope 3 and 4 emissions, their challenges, and opportunities. We’ll also explore practical examples, such as PG&E’s sustainability initiatives and NPUC’s role in helping utilities decarbonize, to illustrate how organizations can integrate these concepts into their sustainability efforts.