A Power BI consultant improves data accuracy by establishing processes for data cleaning, transformation, and validation. They ensure that data from different sources is correctly integrated and that any inconsistencies or errors are resolved before it is visualized in dashboards. Power BI consultant also set up automated refreshes, ensuring that the most current data is always available for analysis. By ensuring high-quality, reliable data, Power BI consultants give businesses confidence in their reports, allowing them to make decisions based on accurate insights. This leads to better strategic planning and performance monitoring.