The Calder platform is a normally unattended steel jacket structure supporting several well slots with Xmas trees and a basic manifold. There is no significant on-platform processing; gas is piped to the Rivers onshore terminal where separation, sweetening and dehydration occur before entry to the national grid. Utilities include remote safety shutdown (ESD), instrument power circuits, basic control instrumentation and chemical injection points for corrosion/hydrate control. Electrical power is supplied by subsea cable from a nearby installation, reducing the need for local generation. Flow assurance relies on methanol or inhibitor injection controlled remotely or by visiting crew. The platform integrates fire & gas detection and automatic shutdown systems complying with UKCS safety standards. Helicopter access is provided via a helideck/landing area for periodic maintenance and intervention.