The study aims to examine how the dimensions of Green intellectual capital (GIC) are related to organizational performance (OP) with employee green behaviour (EGB) as a mediator. With the commonly discussed GIC components, the study considers green spiritual capital (GSpC) as another important dimension of GIC. Data was collected through a questionnaire survey from 169 organizational units operating in the energy-sector in India. Exploratory factor analysis supports the inclusion of GSpC in the construct of GIC. Confirmatory factor analysis validates the measurement model. Structural-equation-modeling using the Partial-Least-Squares method examined the hypothesized relations. Findings reveal that GIC dimensions have varying degrees of direct and indirect effects on OP through EGB. The study contributes to the existing literature by extending the understanding of GIC and its connection with EGB and OP using natural-resource-based theory and social cognitive theory. It highlights significant practical implications for improving a firm’s operational efficiency and financial success.