Book excerpt: Decentralized energy systems paradigm calls for – a) evidence-based policy for local resource assessment, and b) context-specific energy needs assessment for- overcoming ‘barriers’ to decentralized energy systems in India. The pristine bedrock of the book comprises theoretical underpinnings of empiricism, behaviourism and realism. These concepts find their extension through inter-disciplinarity, and the mixed methods approach adopted for understanding spaces and cultures of energy consumption. Demand side management in energy sector entails-migration from a target-based (TB) approach towards an evidence-based (EB) approach for designing context-based policies in respect of energy demand, and an associated policy shift from a techno-economic regime towards a socio-technical regime embedded in ‘appropriate’ contexts. “Prosumerism holds the key to democratization of energy systems in India.”