A Power BI consultant ensures data accuracy by implementing ETL processes, data cleansing techniques, and validation rules before visualizing information. They use automated data refresh, consistency checks, and reconciliation methods to maintain data integrity. Poor data quality leads to misleading insights, wrong decisions, and business inefficiencies. By focusing on error handling, duplicate removal, and audit trails, Power Bi Consulting prevents discrepancies in reports. High-quality data ensures reliable, consistent, and meaningful business intelligence, enabling organizations to trust their analytics and make informed, data-driven decisions with confidence.