A Power BI consultant is responsible for developing, implementing, and optimizing data models, dashboards, and reports that provide business insights. They gather requirements from stakeholders, translate business needs into technical specifications, and create interactive reports using Power BI tools. Additionally, consultants ensure data accuracy, manage data connections, and provide training to end users. They also monitor performance, troubleshoot issues, and ensure that Power BI solutions align with business goals. Regularly updating dashboards and providing data security are also key responsibilities.