The integration of Energy Sharing is proposed to advance the energy transition, enabling end customers to exchange self-generated electricity within defined regional boundaries. If the concept is implemented beneficially, Energy Sharing could be adopted on a large scale, multiplying effects. This study models a nationwide roll-out of Energy Sharing to evaluate its economic and technical impact. A methodological framework identifies representative Distributed Energy Systems, simulating their operation through linear optimization that incorporates diverse energy supply and demand scenarios. Finally, the effects are extrapolated back to the national level. Analyzing different promotion schemes in Germany in 2037 reveals that while Energy Sharing can enhance self-sufficiency for end customers, its economic viability without promotional incentives remains marginal. Promotions significantly boost participant margins but do not substantially increase shared energy volumes. However, the promotion leads to a reduction in income for regulatory accounts. Additionally, Energy Sharing impacts traditional energy suppliers by reducing their income while lowering aggregator expenditures. A second sensitivity analysis investigates the implications of Energy Sharing and Peak Power Margins on distribution grid utilization. Results indicate that Energy Sharing increases asset loading, particularly during simultaneous Electric Vehicle charging driven by Wind Power Plant generation. Effective Peak Power Margin strategies are essential to mitigate these challenges, ensuring loadings remain comparable to scenarios without Energy Sharing.