The rapid proliferation of distributed energy resources (DERs), including solar PV, battery storage, and electric vehicles, is fundamentally transforming power systems worldwide. Regulatory frameworks for the grid integration of DERs have struggled to keep pace, resulting in widespread non-compliance and a range of technical and financial challenges. This paper introduces a novel, penetration-based synthesis that maps DER impacts – including distribution grid constraints, utility revenue pressures, system flexibility, and stability concerns according to the level of DER adoption. We foreground the role of soft law – non-binding guidelines, voluntary standards, and stakeholder coalitions – and the concept of transition work as critical mechanisms for adaptive regulation. Drawing on a systematic literature review and international case studies, we identify how these impacts emerge at different penetration levels and demonstrate how timely, flexible regulatory responses can mitigate risks. Our analysis shows that adaptive, equitable tariff design and collaborative institutional reform are essential for sustainable DER integration. We argue that soft law and transition work enable more responsive, anticipatory regulation than traditional hard law alone. These findings offer actionable pathways for policymakers, regulators, and utility managers seeking to address the evolving technical and institutional challenges of DER integration and accelerate the energy transition.
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