Power BI development strategies can be scaled by adopting a modular approach, where individual components like data models and reports are designed to be reusable across different departments or projects. Implementing data warehouses or data lakes as centralized data sources ensures that all reports pull from the same, consistent data sets. Power BI developers should also include plans for increasing data volume and user load, such as optimizing report performance and using cloud-based Power BI services to handle growing demand. Regularly revisiting and updating the strategy ensures it evolves with the business.