Loren Sprouse, a Block Grain Belt Express-Missouri member and electrical engineer, went to the Missouri Department of Transportation (MoDOT) earlier this year with his concerns about the electric fields that would be created by Grain Belt Express, and their possible corrosive effect on nearby infrastructure. In response, MoDOT has compiled a research report of the most current studies available on the subject. The report, entitled "Effects of Ground Voltage of Stray Current on Infrastructure Caused by High Voltage Direct Current (HVDC) Transmission Lines," cites numerous studies which indicate that DC lines may have a harmful impact on metallic infrastructure when operated in the monopolar mode, or under emergency conditions.

Although Grain Belt Express's website claims that its project will be a bipolar line, Sprouse is still concerned about the extremely high voltage of the line, and the electric fields and stray currents it may produce.

 "This is just another example of not fully understanding the potential long term negative consequences of this project. Our regulators need to enforce extremely high design standards when reviewing such projects around distances from homes, areas where people work around and under these lines, and especially around proximity to pipelines carrying natural gas and other petroleum products," Sprouse said.

The report indicates that monopolar HVDC transmission lines have an extremely corrosive effect on adjacent infrastructure, such as pipelines. Sprouse says that electric fields will always produce some stray currents, even in Grain Belt Express's bipolar HVDC model, or alternating current (AC) transmission lines.

The report confirmed Sprouse's worry, stating "The effect of stray current corrosion on underground infrastructure has been a concern for decades. As one example, a 1967 article warned about the "stray current corrosion of underground metallic structures" caused by HVDC transmission lines. In the literature, most studies are concerned about potential damage to pipeline structures." The report also quoted a 2008 GAO report that identified a risk "associated with siting HVDC electric transmission lines along active transportation ROW ... Stray current could interfere with railroad signaling systems and highway traffic operations, and accelerate pipeline corrosion, resulting in accidents."

Curt Jacobs from Erie, Illinois, echoed the concerns of Sprouse when commenting on a pipeline explosion that occurred last August adjacent to an AC transmission line near the proposed Rock Island Clean Line route.

"This pipeline explosion opened our eyes to the dangers of power lines close to pipelines. The suggestion that DC power can be even more corrosive than AC power raises significant safety questions for those of us that would be forced to live and work near Clean Line's proposed projects and the existing pipelines the routes attempt to parallel," he said.

Block GBE spokeswoman Jennifer Gatrel is worried that siting Grain Belt Express parallel to buried pipelines for approximately 119 miles across Missouri is too risky to the families who live and work close by. Approximately 53% of the GBE proposed route is sited within a mile of the pipeline corridor.

"We are very concerned about the implications of this report. Grain Belt wants to run their massive line close to pipelines through much of the state. The report makes it clear that there could be a real and present danger of doing so," she said. "As a mother to small children the idea that they could be put in danger is not acceptable!"
 
Some of Block GBE's major concerns, in addition to safety issues, are property rights, property devaluation, health effects, and the impediments to farming posed by the lines. Citizens interested in reading the report in full or learning more about the issue can find more information at www.blockgbemo.com or by calling 660-232-1280. The public will also have a chance to weigh in on the issue directly to the Missouri PSC who will decide whether to allow Grain Belt to build the lines. The schedule is located at the group's website here.
 


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