Abstract The present paper deals with a screen-based ecological interface designed to support the operators' work in a medium voltage electricity distribution control room. More specifically, the focus is placed on how the designed interface supports operators in skill-, rule-, or knowledge-based behaviour, as well as in the transition between the three levels of behaviour. The aim of this work is to multiply the examples of ecological interface designs for industry-scale applications, in order to contribute to the maturation of this promising design approach for complex socio-technical systems. Relevance to industry Ecological Interface Design has shown its value in diverse domains. Present work is expected to become a prototypical case for the electricity distribution industry, as it demonstrates the applicability and effectiveness of ecological design for domain operations.