The pipeline not only transports gas to the power station but also stores enough gas to allow the power station to run at full capacity for five hours. Take a look at the Colongra Gas Transmission and Storage Pipeline map.
The existing Sydney to Newcastle gas supply cannot meet the peak demand of the power station and so the Colongra pipeline is designed to be pressured over a 24 hour, off peak period and held at pressure until the power station is brought on line during peak periods.
The Colongra pipeline includes 3.5 kilometres of 10 inch feeder pipeline, a 42 inch storage pipeline, a compressor station that increases gas pressure from 3.4MPa to 13MPa and a let-down station. It is the largest on-shore gas pipeline in Australia and is double looped to create nine kilometres of pipeline storage in a three kilometre stretch of land.
Pursuant to Rule 558 of the National Gas Rules, the User Access Guide can be found here.