Md. Gov. Larry Hogan (R), right, and Delaware Gov. Jack Markell (D), left. (Ovetta Wiggins/TWP)

Maryland Gov. Larry Hogan is joining forces with Delaware Gov. Jack Markell (D) to fight an increase in electricity rates to cover the cost of a power line that will connect Delaware to a nuclear power complex that sits off its shores.

Hogan (R) said the Federal Energy Regulatory Commission made a “terrible” move earlier this year when it ruled against Delaware’s request to lower the state’s share in paying for the power line, which according to Hogan and Markell (D) will largely benefit New Jersey customers.

“This is a mistake. It is unreasonable and it is not fair to the hardworking ratepayers of Maryland and Delaware,” Hogan said during an appearance with Markell on Tuesday.

“We will use every tool at our disposal to reverse this improper decision.”

Last week, the commission agreed to rehear the issue.

In joining Markell, Hogan pits himself against New Jersey Gov. Chris Christie (R), a close friend and ally who campaigned for Hogan when he ran for governor in 2014.

Hogan also endorsed Christie’s presidential bid last year, but he has not expressed support for Christie’s decision to back presumptive GOP nominee Donald Trump after Christie dropped out of the race.

Hogan has said he does not support Trump’s candidacy and will not vote for him in November.

Asked Wednesday whether he had spoken to Christie about the rate increases, Hogan said he reached out to his fellow blue-state Republican governor but that they never connected.

The regulatory commission’s plan would charge 90 percent of the total cost of the project to residents of Delaware, Maryland and Virginia, Hogan said, with Delaware residents expected to cover 60 percent of that cost, Maryland residents 35 percent and Virginia residents 5 percent.

Asking New Jersey residents to pay only 10 percent is “neither equitable nor in accordance with the established cost allocation practices,” Hogan wrote in a letter this week to Norman C. Bay, the commission’s chairman.

The commission has said that Delaware and Maryland residents will benefit from the new power line. But Hogan and Markell argue that based on usage, they will not benefit as much as those who live in New Jersey.

Mary Beth Tung, the director of the Maryland Energy Administration, said that at least 385,000 Maryland residents would be affected by the rate increases. She estimated that the average customer would pay $2 to $3 more a month.

Markell and the Delaware Public Service Commission complained last year to the Federal Energy Regulatory Commission about the escalating costs of the pipeline project. On Wednesday, Markell said the proposed distribution of costs was unjust and irresponsible.

“It’s imperative that FERC resolve this issue without delay and before the project moves too far along,” Markell said. “Planning for construction is already underway, and uncertainty about electricity costs can impact economic development.”

Hogan’s meeting with Markell was part of a multiday trip to Maryland’s Eastern Shore that included a speech Tuesday night to officials from across the state who were attending the Maryland Municipal League Convention in Ocean City.

Hogan told the crowd of about 700 that he plans to continue to fight the majority-Democratic legislature over funding road projects, and he enlisted the help of local elected officials in that effort.

“We cannot and will not let” state lawmakers hinder road and bridge repairs, Hogan said during his 10-minute address.

Hogan and the legislature have been in a protracted battle over how transportation funds should be spent. Last year, the governor killed the Red Line light-rail project affecting Baltimore City and Baltimore County and slashed the state’s share of the costs of the Purple Line in Prince George’s and Montgomery counties.

During the same transportation announcement, Hogan increased the amount of funding for road repairs.

This year, the General Assembly responded by overturning the governor’s veto of a bill that requires the state to score transportation projects before choosing which plans to fund.

Hogan could not attend the convention last year because he had just been diagnosed with cancer and had begun chemotherapy.

He sent Lt. Gov. Boyd Rutherford in his place, and attendees posted pictures on social media of them wearing green “Hogan Strong” bracelets and signing an oversize get-well card.

On Tuesday, Hogan thanked the officials for their prayers and good wishes.

“I will never forget seeing the photos of all of you here signing that giant get-well card,” Hogan said.

“Even though I’m a year late, I want you all to know I am thankful to be standing here tonight in remission, 100 percent cancer-free and feeling strong.”