Combined Cycle, Gas

Major Upgrade of Oregon Power Plant Completed

A comprehensive upgrade of the gas turbine in Unit 2 at Avista’s Coyote Springs combined cycle power plant in Boardman, Oregon, has been completed, GE announced Thursday.

The 280-MW unit was upgraded with GE’s Advanced Gas Path and Dry Low NOx 2.6+ combustion technologies. The improvements boosted the unit’s capacity by 18 MW in combined cycle mode and increased fuel efficiency by 1.56 percent, GE said.

“This upgrade project made sense because a more flexible combined-cycle plant allows us to better respond to increased energy demands during the winter months and support regional grid stability,” said Jason Thackston, Avista’s senior vice president of Energy Resources. “Increasing the capacity of our existing facilities also reduces the urgency to build new generating capacity in the region.”

GE’s AGP technology, which includes hardware solutions and advanced materials, allow operators to run their plants at higher operating temperatures. The improvements are often coupled with advanced controls software to boost gas turbine performance and the installation of a new DLN 2.6+ combustion system to lower emissions without using additional water.

The technology also improves gas turbine durability and extends maintenance intervals from three to four years, reducing operating costs and downtime, GE said.

The DLN 2.6+ combustion technology also enables operators to burn multiple fuel types, in addition to natural gas. The flexibility allows plants to purchase fuel based on composition and price, allowing them to reduce fuel costs while maintaining low emissions.

The rehabilitation of existing combined cycle gas turbines is a central focus for GE’s Power Services business. The company has completed a series of similar projects in North America, and recently agreed to modernize four power plants owned and operated by Dynegy Inc. The improvements are expected to increase the plants’ output by a total of 210 MW, GE said.