Signs in favor and agains the Central Maine Power corridor are on display. Credit: Fred Bever | Maine Public

The state supreme court is set to hear arguments — via video conference — over disputed petitions that helped to put a $1 billion hydropower transmission corridor project on the state’s November ballot.

The New England Clean Energy Connect’s backers contend Secretary of State Matthew Dunlap misinterpreted state law when he accepted petitions notarized by people who performed other work for groups collecting petitions.

If the court agrees, then the number of certified signatures would fall short of the threshold of about 63,000 for the ballot.

Attorneys were expected to hold arguments Tuesday via teleconference.

All told, the Maine secretary of state’s office rejected 16,332 signatures but found that there were enough valid signatures to surpass the threshold by 3,050 signatures.

CMP’s New England Clean Energy Connect calls for construction of a 145-mile transmission line to bring 1,200 megawatts of electricity from Hydro-Quebec to the New England power grid to meet Massachusetts’ clean energy goals.

Most of the transmission line would follow established utility corridors, but a new swath would be cut through 53 miles of wilderness