The notions of Collaborative Virtual Power Plant Ecosystem (CVPP-E) and Cognitive Household Digital Twin (CHDT) have been proposed to contribute to the efficient organization and management of households within Renewable Energy Communities (RECs). Both ideas can be represented by digital twins, which complement each other. CHDTs can be modelled as software agents, designed to possess some cognitive capabilities which could enable them to make autonomous decisions, based on the preferences or value system of their owner. Due to their cognitive and decision-making capabilities, these agents could exhibit some behavioural attributes such as engaging in collaborations, mutually influencing one another and the ability to adopt some form of social innovation. These behavioural attributes are expected to promote collaboration which are envisioned to increase the survivability and sustainability of the CVPP-E. This study therefore seeks to demonstrate the capability of CHDTs to mutually influence one another towards a common goal - thus promote sustainable energy consumption. We adopted a multi-method simulation technique that involves the integration of multiple simulation paradigms such as System Dynamics, Agent-Based, and Discrete Event simulation techniques on a single simulation platform. The outcome of the study shows that mutual influence could enhance the sustainable consumption in the ecosystem.