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Gibson Generating Station


Gibson Generating Station

Gibson Generating Station
The power plant is often still referred to by locals as PSI, in reference to its original owner, Public Service Indiana, even when it was owned by Cinergy. The plant's two new 620 ft (190 m) smokestacks are seen in the back, behind its four original 550 ft (170 m) stacks. Units 1-4 and five of the six stacks are shown.
Gibson Generating Station is located in Indiana
Gibson Generating Station
Location of Gibson Generating Station
Country United States
Location Montgomery Township, Gibson County, near Owensville, Indiana
Status Active
Commission date 1971-82 under Public Service Indiana
Decommission date none
Owner(s) Duke Energy Indiana
Public Service Indiana
Power generation
Primary fuel Pulverized coal
Units operational 5 General Electric 630 MW turbines
Nameplate capacity 3,340MW

The Gibson Generating Station is a coal-burning power plant located at the northern end of northern Montgomery Township, Gibson County, Indiana, United States. It is close to the Wabash River, 1.5 miles southeast of Mount Carmel, Illinois, 2 miles south of the mouth of the Patoka River, and 4 miles south of the mouth of the White River. The closest Indiana communities are Owensville 7.5 miles to the southeast of the plant, and Princeton, 10.5 miles to the east. With a 2013 aggregate capacity among its five units of 3,340 megawatts, it is the largest power plant run by Duke Energy,[1] the third-largest coal power plant in the world, and the tenth-largest electrical plant in the United States,[2] With the reduction of Nanticoke Generating Station, it became the largest coal power plant in North America by generated power late in 2012. Also on the grounds of the facility is a 3,000-acre (12 km2) large man-made lake called Gibson Lake which is used as a cooling pond for the plant. Neighboring the plant is a Duke-owned, publicly accessible access point to the Wabash River near a small island that acts as a wildlife preserve. This is the nearest boat-ramp to Mount Carmel on the Indiana side of the river. Located immediately south of Gibson Lake, the plant's cooling pond, is the Cane Ridge National Wildlife Refuge, the newest unit of the Patoka River National Wildlife Refuge and Management Area. Opened in August 2006, this 26-acre (11 ha) area serves as a nesting ground for the least tern, a rare bird. Cane Ridge NWR is reportedly the easternmost nesting ground for the bird in the U.S. The Gibson Generating Station is connected to the power grid via five 345 KV and one 138 KV transmission lines to 79 Indiana counties including the Indianapolis area and a sixth 345 KV line running from GGS to Evansville and Henderson, owned by Vectren and Kenergy.[3]


  • History 1
  • Recent additions 2
  • Unit Information 3
  • Earthquake Effects 4
  • Environmental concerns 5
  • See also 6
  • References 7
  • External links 8


Gibson Generating Station was originally built as a two-unit coal-fired power plant in 1972 by Public Service Indiana (PSI). The 1970s saw the addition of Units 3, 4, and 5 in 1982, but only two more stacks. In the 1990s, number 4 was separated from number 3's stack and each was given its own stack.

Cinergy took over PSI in 1995. During this time, all five units were fitted with new Selective catalytic reduction (SCR) units, mounted on the back of each unit. During this construction, one of the largest cranes in the world was erected at GGS. Despite this the station only had 4 stacks for 5 units. Units 1 & 2 still shared a single-flued smokestack and Unit 3 was still using the old 3 & 4 smokestack (the two darker smokestacks in the above photograph).

Duke Energy took over Cinergy in May, 2006.

Recent additions

Work was just recently completed on the plant's two new 620 ft (190 m) smokestacks. The wider two-flue stack is for Units 1 & 2 with a flue for each unit, replacing the older, share-flued smokestack, while the narrower stack is for Unit 3, completely replacing the old 3 & 4 smokestack. All four newer smokestacks (1 & 2, 3, 4, & the older Unit 5) all usually put out a full plume while the older two are now stripped out derelicts pretty much left to nesting cliff birds such as the peregrin falcon or the bald eagle which are usual residents around the Main Plant Complex.

A series of SCR units have been installed to decrease its NOx emissions, these improvements were completed in 2008 with Unit 5 being the last. Several projects are being planned to increase the capacity of the station to as much as 3,750 MW.

Unit Information

Gibson Generating Station, Owensville, IN
Complex Area: 6.1 sq mi (16 km2)
Unit 1
Fully Owned
Unit 2
Fully Owned
Unit 3
Fully Owned
Unit 4
Fully Owned
Unit 5
2005 Maximum Power Output (MW) 635 635 635 627 625 3,342MW
Ongoing Construction and Maintenance in two periods: Fall Outage and Spring Outage. Construction & Maintenance rotates among the five units with short periods as needed.
Ownership Duke Energy 100% Duke Energy 100% Duke Energy 100% Duke Energy 100% Duke Energy 51%
Wabash Vly. P.A. 24.5%
Indiana Mun. P. A. 24.5% [4]
Duke Energy 90.3%
W.V.P.A. 4.87%
I.M.P.A. 4.87%

Earthquake Effects

At 4:37:00am CDT (9:37:00 UTC) on April 18, 2008, a 5.2 Richter Scale Earthquake rocked the area. The epicenter was located 7 miles (11 km) northwest of the station in nearby Wabash County, Illinois. Some minor damage was recorded but the only visible effect was that Unit 4 deactivated itself because of its vibration detectors.[5]

Environmental concerns

  • The lake was closed for fishing in 2006 due to high selenium levels.[6]
  • Unit 4 accidentally released a blue haze that floated for a time over Mount Carmel, as emissions of sulfuric acid descended on the town, aggravating respiratory illnesses and prompting an investigation by the Illinois Environmental Protection Agency.
  • There have been undocumented concerns voiced as recently as September 2007 that the plant's ash disposal pits have been leaking boron into the water tables of the area.[7]

See also


  1. ^ Duke Energy - Gibson Generating Station
  2. ^ Power plants by capacity - United States DOE
  3. ^ This page has moved
  4. ^ Gibson Station - Duke Energy
  5. ^
  6. ^ Gibson Lake Will Not Reopen for Fishing April 1 - Duke Energy
  7. ^ Indiana Law Blog - Environment - Gibson Generating Plant Multi-Jurisdictional Issues 08/2004

External links

  • Duke Energy - Gibson Generating Station
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