To ensure data governance, Power BI consultants should implement strict access controls such as Row-Level Security (RLS) and use Microsoft's Azure Active Directory to manage user permissions. Power BI consulting should also ensure that reports comply with organizational data governance policies by auditing data sources and ensuring data accuracy. Setting up Power BI's data lineage features to track the flow of data from source to report helps in maintaining compliance. Additionally, implementing DLP (Data Loss Prevention) policies protects sensitive data from accidental leaks.