The document discusses security challenges related to data in the smart grid. It notes that smart grid data will be more expansive in volume and variety compared to current utility data. Specifically: - Smart grid data will include more diagnostic information collected at higher frequencies from devices like meters, homes and vehicles. - Not all smart grid data needs to be treated the same - it can be logically segmented based on attributes like lifetime, sensitivity and intended use by applications. - Following practices like compartmentalizing data access and storage can help make smart grid systems more secure, efficient and compliant with regulations by enabling controlled access and easier anomaly detection.