POWER August 2013 - 50

PLANT DESIGN
Repowering South Mississippi
Electric Power Association's
J.T. Dudley, Sr. Generation Complex
Repowering two units at the J.T. Dudley, Sr. Generation Complex added 180 MW
of high-efficiency capacity to South Mississippi Electric's portfolio. Now the
cooperative can self-produce more than 50% of its electricity needs.
By Joseph W. Mashek and Benjamin L. Frerichs, Burns & McDonnell and Chris K. Rhodes, South Mississippi
Electric Power Association
T
he J.T. Dudley, Sr. Generation Complex,
owned and operated by South
Mississippi Electric (SME), is located
in Jones County, Miss. Originally installed
in 1968 at what was then called the Moselle
Generating Station were Units 1, 2, and 3,
nearly identical 60-MW conventional steam
plants. Units 4 and 5, General Electric (GE)
7EA simple cycle combustion turbines, were
added in 1997 and 2005, respectively.
Today, the complex consists of five units
capable of generating more than 500 MW.
The additional capacity will pay long-term
dividends to SME's customers in the form of
increased system reliability and more control
over its production costs. The cooperative
forecasts that as of 2013 it can self-generate
51% of its power needs; it purchases bulk
power for the remainder.
The repowering project converted Units
1 and 2 into two, independent 1 x 1 combined
cycle units. Both original gas-fired
boilers were retired in place and the steam
source for each unit was replaced with a
new GE 7EA combustion turbine (CT) and
a Vogt Power International (VPI) heat recovery
steam generator (HRSG). The new
power block is located approximately 400
feet from the existing powerhouse, with piping
and cable tray routed along a three-level
pipe rack between the HRSGs and powerhouse
(Figure 1).
Construction began in August 2010. The
commercial operation date (COD) for Unit 2
and Unit 1 combustion turbines in simple cycle
operation was November and December
2011, respectively. The COD dates for Unit 2
and Unit 1 in combined cycle operation were
May and November 2012, respectively.
Burns & McDonnell provided consulting,
detailed design, procurement, construction
management, and startup services. SME
designed, procured, and installed the CT
generator step-up transformer and interconnection
power line, as well as the existing
plant switchyard expansion.
A multi-phase and multi-contract approach
was used on the remainder of the
project. Beginning in August 2010, James
Construction Group kicked off construction
with site civil work and foundations, plus
electrical and mechanical underground construction.
Next, PCL Constructors followed
in December 2010 with the combustion
turbine and simple cycle portion of the construction
project. The Saxon Group handled
the final two major construction contracts:
electrical and HRSG erection plus the combined
cycle balance of plant, beginning
work in January 2011 (Figure 2).
1. Plant overview. SME's J.T. Dudley, Sr. Generation Complex repowered two of its three conventional steam plants built in the late 1960s
(far right) using two GE Frame 7EA combustion turbines (left) and two heat recovery steam generators (HRSGs, center). The steam produced by
the HRSGs is moved across a pipe bridge to the existing steam turbines. Courtesy: Burns & McDonnell
50
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POWER | August 2013
http://www.powermag.com

POWER August 2013

Table of Contents for the Digital Edition of POWER August 2013

Contents
POWER August 2013 - Cover1
POWER August 2013 - Cover2
POWER August 2013 - Contents
POWER August 2013 - 2
POWER August 2013 - 3
POWER August 2013 - 4
POWER August 2013 - 5
POWER August 2013 - 6
POWER August 2013 - 7
POWER August 2013 - 8
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POWER August 2013 - Cover3
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