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SRP completes $470 million project to reduce emissions

From the May 9, 2014 issue of Public Power Daily

Originally published May 9, 2014

The Salt River Project (SRP) has completed a $470 million effort to further reduce emissions from the Phoenix-based utility’s largest single generator. On May 1, the last component of the project – selective catalytic reduction technology (SCR) – to lower nitrogen oxide (NOx) emissions from the Coronado Generating Station (CGS) became operational, SRP said. The new controls not only further reduce sulfur dioxide (SO2) and NOx emissions from the plant, but also address mercury emissions, the utility said.

The project was a result of a 2008 agreement between SRP and the U.S. Environmental Protection Agency to improve regional air quality by installing equipment and systems to remove additional emissions of NOx and SO2 from the plant, the utility said.

The Coronado plant "is a critical component of SRP’s fleet of generating facilities that provide affordable and reliable electricity to our customers 24 hours a day," said CGS manager Dan Bevier. "Now we will be able to achieve this goal and significantly reduce emissions."

Completed in 1980, the 800-MW coal-fired plant was equipped with then state-of-the-art emission controls, including partial flow scrubbers for SO2 reductions and electrostatic precipitators for particulate matter reduction.

The environmental improvement project included the installation of low-NOx burners on each of the two generating units and construction of new 100 percent flow SO2 removal systems on each of the units, plus construction of two new 400-foot concrete exhaust stacks and two 22,000-square-foot multi-level absorber buildings. The project required more than 4,000 individual pieces of equipment, more than 29,000 cubic-yards of concrete, nearly 8,000 tons of ductwork and structural steel and more than a million feet of new conductor, SRP said. The project team also coordinated a global supply chain of consultants and specialized equipment manufacturers located on four major continents.

The environmental improvement effort at CGS was one of the largest construction projects in Arizona and involved nearly 3,000 workers and contractors at a time when the state was in the midst of the great recession, SRP senior project manager Gary Barras said. He said the project team completed each phase of work on schedule and with an outstanding safety record.

In addition to installing enhanced emission controls at CGS and as part of the agreement with EPA, SRP funded $4 million in several supplemental environmental projects, including installing solar photovoltaic systems at public schools, upgrading emission controls on school buses, and replacing wood-burning stoves with clean-burning wood pellet stoves

SRP is the largest provider of electricity to the greater Phoenix metropolitan area, serving more than 985,000 customers.


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