A major Midwestern carbon dioxide pipeline project has been canceled. Navigator CO2 Ventures today (Fri) announced the cancellation of its proposed 1,300-mile Heartland Greenway project.

The pipeline would have carried CO2 emissions from more than 20 industrial plants across Illinois, Iowa, Minnesota, Nebraska and South Dakota, to be buried underground in Illinois.

The cancellation comes soon after the company withdrew its application for a crucial permit in Illinois, and also said it was putting its other permit applications on hold.

South Dakota regulators last month denied Navigator a construction permit for its pipeline.

In a written statement, the company said the “unpredictable nature of the regulatory and government processes involved, particularly in South Dakota and Iowa” were key to the decision to cancel the project.

Regulatory panels in North and South Dakota recently dealt blows to Summit Carbon Solutions’ proposed $5.5 billion, 2,000-mile interstate pipeline network.

It would carry CO2 emissions from more than 30 ethanol plants in the Dakotas, Minnesota, Iowa and Nebraska…to be buried underground in central North Dakota.

North Dakota regulators denied Summit a siting permit, but granted the company’s request for reconsideration.

The South Dakota panel denied the company’s permit application, but Summit intends to reapply.