While general-purpose and domain-specific modeling languages are commonly employed, there is also merit in considering purpose-specific methodologies, tailored to unique research endeavors. This was exemplified in the investigation of business models and their IT implementation within Germany’s decentralized energy sector. The increasing collaboration among enterprises in this sector underscores the need for an integrated approach, encompassing business models, value networks, and an extended enterprise architecture. While there are already excellent solutions available for each of the three levels of analysis, there remains a deficiency in an integrative solution. Building upon existing methodologies such as the Business Model Ontology, e3value, and the Business Objectives Compliance Architecture Framework, a project-specific solution was consequently crafted: Network Business Model Architecture (NBMA). The approach makes it possible to depict the relationships between the actors as a value network. In addition, the individual business models of the actors are considered, each of which is also modelled as a canvas. Business and IT capabilities can be seamlessly linked to support the value network, the actors, or individual components within the business model. The article describes the conception of the NBMA methodology and outlines alternative solutions and requirements. The method itself is then presented in detail, followed by the presentation of a proof of concept based on a selected case study.