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California is a pioneer in energy system innovations, and it is not surprising that the state is leading the nation in the adoption of microgrids. However, the inherent characteristics of microgrids make them challenging to integrate and operate within the current energy system. This is mainly because unlike other decentralized energy systems, microgrids often tend to interact with the centralized grid infrastructure as both a parallel and a competing distribution grid model at the micro scale. The adoption and integration of microgrids, therefore, represents a socio-technical transition in the electric power sector. In this context, this study relies on the Multi-Level Perspective framework to examine the drivers, contexts, processes, and policies that have enabled an ongoing transition in California's electricity system that has allowed adoption of microgrids. The analysis shows that even though several drivers carry weight, including resilience concerns and market factors, California's pathway to microgrids is largely driven by the legislative and regulatory push toward clean energy and a symbiotic relationship between powerful regime actors and a microgrid niche. This is enabling a transformation in the state's energy system, in which the entry of microgrids is subtly facilitated by the regime in a way that does not threaten the current utility-dominated electricity system. By providing a detailed account of how a decentralized energy system that challenges the centralized grid regime has made its place in the centralized grid regime in California, this paper identifies the key facets that affect the integration of microgrids in the broader context of energy transitions. • A Multi-Level Perspective analysis of microgrid adoption in California is presented. • Legislative and regulatory push toward clean energy is driving this transition. • Microgrids are being nurtured by a symbiotic relationship between regime and niche. • The study shows that symbiotic niche-regime relationship is key in energy transitions. [ABSTRACT FROM AUTHOR]