natural gas is metered and enters the National Transmission System at an above ground installation (54°36’37”N, 1°11’48”W) in the south-west corner of the terminal site. The four-mile (6 km) spur of Feeder Main FM06 transports gas to a pigging and pressure reduction station at Cowpen Bewley in Stockton-on-Tees, where gas is delivered into the Regional Transmission System, there are also connections to the 24-inch Feeder Main FM06 from Little Burdon to Billingham and into the 42-inch Feeder Main FM13 from Cowpen Bewley to Bishop Auckland. The site has two tall chimneys and one taller flare stack. The site belongs to the Teesmouth Industry and Wildlife Partnership. TGPP terminal From 1999, gas that was not processed by the CATS terminal went to the plant immediately to the west (54°36’38”N, 1°12’01”W) which was originally operated by px Ltd. Originally some of this gas went through the px Ltd plant to the (former Enron) 1875MW Teesside power station, next to the former ICI plant at Wilton, Redcar and Cleveland. This power station was de-commissioned in 2015 and subsequently demolished, only the 2 x GIS (gas insulated substations) 275kV feeder points to the National Grid remain. This terminal is known as the Teesside Gas Processing Plant or TGPP. In addition to CATS it also processes gas from Breagh field in the Southern North Sea, Block 42/13a. Gas and associated condensate from Breagh Alpha platform is transported via 20-inch diameter 110 km pipeline to Coatham Sands, Redcar and then by a 10 kilometre onshore pipeline to TGPP at Seal Sands. The Breagh Alpha platform is unmanned and is operated remotely from the TGPP Control Room. There is a dedicated gas treatment train for Breagh fluids. Entry specification The Breagh Southern North Sea (SNS) pipeline is available to third party production. The fluid specification for entry into the SNS pipeline is as follows. Gas processing (CNS/CATS) The CATS processing train uses turbo-expanders to reduce the temperature of the gas to remove natural gas liquids. CATS gas is first dehydrated with TEG to remove water. The gas is routed to two turbo-expanders in series which chills the gas and condenses out the natural gas liquids, the product is mainly methane. NGL goes to the deethanizer fractionation column which removes ethane, this is mixed with the methane and is supplied to the National Transmission System. The NTS access point is the above ground installation (54°36’37”N, 1°11’48”W) on the