Guardian Gas Pipeline

From Global Energy Monitor
This article is part of the Global Fossil Infrastructure Tracker, a project of Global Energy Monitor.

Guardian Gas Pipeline is a natural gas pipeline running from Illinois to Wisconsin. [1]


The pipeline runs from Joliet, Illinois, to Ixonia, Wisconsin. [1]

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Project Details

  • Operator: Guardian Pipeline Co[2]
  • Owner: ONEOK Partners
  • Capacity: 750 Million cubic feet per day[2]
  • Length: 142 miles / 229 km[2]
  • Diameter: 16, 36 inches[2]
  • Status: Operating
  • Start Year: 2002[2]
  • Cost: $238 million[2]


The Guardian Pipeline is approximately 142-miles of 36-inch diameter pipe extending from Joliet, Illinois to Ixonia, Wisconsin. It is owned by ONEOK, Inc.[3] The pipeline has the capacity to transport more than 750 million cubic feet per day of natural gas.[1] The pipeline is initially projected to carry about 750 million cubic feet of natural gas a day to northern Illinois and southeastern Wisconsin. Depending on market needs, the pipeline can be expanded up to 1.1 billion cubic feet per day. The total cost of the project is estimated to be $230 million.[4]

Prior to construction and in accordance with the Illinois Endangered Species Act, the Guardian Pipeline Conservation Plan indicated two species of state-threatened mussels, the slippershell (Alasmidonta viridis) and the spike mussel (Elliptio dilatata), may inhabit the project area and be adversely affected by construction. Guardian proposed surveying and relocating all endangered mussels found in the area of construction of the Guardian Pipeline.[5]

Articles and resources


  1. 1.0 1.1 1.2 "Guardian Pipeline Interstate Transmission Project", DLZ, accessed January 2018
  2. 2.0 2.1 2.2 2.3 2.4 2.5 "Natural Gas Data - U.S. Energy Information Administration (EIA)". Retrieved 2023-08-24.
  3. "Pipeline" ONEOK, Inc. accessed January 2018.
  4. "Guardian Pipeline Will Bring Competition, Reliability, Lower Prices to Key Illinois and Wisconsin Natural Gas Markets" WEC Energy Group, accessed January 2018
  5. Guardian Gas Pipeline Conservation Plan, Illinois Department of Natural Resources, accessed January 2018

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External resources

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