GST Nuances in Captive Power Plants

Captive power plants occupy a uniquely complex position within the GST framework. Electricity itself remains outside the scope of GST, yet the equipment, fuel, services, and infrastructure used to generate electricity are largely taxable. This creates a structural imbalance. The complexity increases when electricity generated in a captive power plant is partly consumed internally and partly supplied to the grid or to related entities. In such situations, businesses must carefully navigate the rules governing input tax credit reversals, particularly under Rules 42 and 43 of the CGST Rules. Questions often arise regarding the eligibility of credit on capital goods, allocation of common credits, treatment of fuel inputs, and valuation of transactions involving group entities. Additional issues emerge in areas such as renewable energy projects, waste heat recovery systems, electricity banking arrangements, and the taxation of renewable energy certificates and carbon credits. These aspects require careful structuring of contracts, strong documentation practices, and robust energy accounting systems. Given the increasing scrutiny by tax authorities and the growing reliance on operational data such as generation ratios and fuel consumption patterns, companies operating captive power plants must adopt a structured compliance framework. A well-designed tax governance approach can help preserve legitimate input tax credits while minimizing the risk of disputes and litigation under GST.