For electric utilities, NERC CIP isn't just a suggestion; it's the law. Violations can cost over $1 million per day. The core of CIP reliability standards (specifically CIP-005) is the Electronic Security Perimeter (ESP).
The IT/OT Air Gap Myth
True air gaps are rare and impractical in modern grids. You need data from the OT (Operational Technology) side for billing, maintenance, and analytics. The goal is strict, monitored segmentation, not total isolation.
Implementing Electronic Access Control Points (EACP)
We utilize Next-Generation Firewalls (NGFWs) as EACPs. But a firewall rule allowing "Any" is a violation. Traffic flows must be strictly defined. We use industrial-aware firewalls that can inspect the SCADA protocols (DNP3, Modbus) themselves, ensuring that a "Write" command is never allowed from a read-only monitoring segment.