To reduce the carbon footprint, improve manufacturing sustainability, and enhance energy efficiency, a reliable, efficient, and sustainable energy system is essential. A key objective of the German energy system is the efficient transmission and distribution of renewable electricity, reinforced by regulatory requirements. However, incentives to improve transmission efficiency, especially minimizing energy losses, remain insufficient. Power quality, particularly harmonics, plays a crucial role in this context. This study examines how harmonics affect energy efficiency. Prior research shows that mitigating harmonics can reduce energy losses, benefiting both the economy and manufacturing processes reliant on electrical energy. This paper quantifies potential energy savings for businesses by reducing harmonic-induced power losses. These savings are monetarily quantified, translating directly into lower grid usage fees, enhancing sustainability and business models. The study also explores approaches for harmonic mitigation within regulated electricity markets, identifying necessary regulatory adjustments for sustainability. The core contribution is calculating the reduction in primary energy demand resulting from such measures, reducing the carbon footprint and improving manufacturing sustainability. Based on these findings, the paper proposes a sustainable business model developed using Jacobsen’s integrated methodology for regulated markets, advancing the sustainable energy transition and development.