This study investigates the machining of Inconel 600 using Electrical Discharge Machining (EDM) with a focus on sustainability. Specifically, a comparative analysis was conducted between conventional EDM and Powder Mixed Electrical Discharge Machining (PMEDM) utilizing a silicon carbide and polyethylene glycol (SiC-PEG) powder mixture. In this study, different dielectric viz. kerosene, deionized water, and SiC-PEG mixed with deionized water is used. The research aimed to evaluate the impact of different dielectric mediums on machining characteristics such as Surface Roughness (SR), Tool Wear Rate (TWR), and Material Removal Rate (MRR). Additionally, a process sustainability index was used to assess the environmental implications of both conventional and green dielectric-based machining processes. The findings provide insights into optimizing EDM processes for hard-to-machine materials while minimizing environmental impact. Based on the process SI metrics, deionized water and SiC-PEG with deionized water had slightly better process sustainability index metrics than Kerosene. Also, deionized water and Sic-PEG with deionized water had much better environmental impact and energy consumption metrics than Kerosene.