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The Client

Located in northwest England, Rocksavage is a combined cycle gas turbine (CCGT) power plant with a generating capacity of 810MW. It’s owned by InterGen, which operates power stations in the UK and Australia with a combined 4,000MW of capacity across six advanced technology projects.

The Challenge

With no long-term service agreement in place with the OEM, the Rocksavage leadership team planned to self-manage the maintenance outages, parts ordering and repairs. They recognized the need for an external resource with Alstom GT26 experience and knowledge to help execute this plan.

The Solution

Rocksavage plant management heard Siraj Taj speak at the AOG Users Conference in 2020 and knew they’d found the expert they needed. In an initial conversation, ST Power Services suggested a conceptual approach that might work for them. Plant management hoped to defer a planned maintenance outage to 2023, and needed to know if that was feasible. Site historic information was assessed and a GT parts assessment was conducted to maximize the service life of hot gas path parts and structural components. ST Power Services discovered that Rocksavage could potentially extend its maintenance cycle from 24kEOH to 32kEOH (an approximate 1-year extension) and determined the optimum parts configuration for the next major inspection. As a result, Rocksavage is well-positioned to make strategic decisions on maintenance of the turbines, and is expecting significant savings — totalling millions of pounds — on future outage costs.

The Bottom Line

"ST Power Services exceeded our expectations, and it was absolutely the right decision to hire them. A huge thank you from myself and the wider Rocksavage team, and I look forward to working closely with ST Power Services in the future."

– Paul Swire


Engineering Manager

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