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Yukon Premier Darrell Pasloski, Northwest Territories Premier Bob McLeod, Newfoundland and Labrador Premier Paul Davis, Ontario Premier Kathleen Wynne and Nalcor CEO Ed Martin, left to right, tour the construction site of the hydroelectric facility at Muskrat Falls, Newfoundland and Labrador on Tuesday, July 14, 2015. The project includes the construction of an 824 megawatt hydroelectric dam on the lower Churchill River in Labrador.Andrew Vaughan/The Canadian Press

Estimated costs for the troubled Muskrat Falls hydro megaproject in Labrador have now hit $11.4-billion including financing.

That's up from an original estimate of $7.4-billion – including the cost of borrowing – when the development was sanctioned in 2012.

First power from the dam and hydro station under construction on the lower Churchill River was expected next year, but Nalcor Energy CEO Stan Marshall now says first power is delayed until the fall of 2019.

"In my opinion the Muskrat Falls project was not the right choice," Marshall told a news conference Friday.

Still, he said he expects the project will "finish strong."

Full power from Muskrat Falls to the island of Newfoundland and on to Nova Scotia through subsea cables is expected in mid-2020.

Marshall says original cost estimates were optimistic or overly aggressive.

He also says some contractors lacked experience working in harsh environments and that early execution by some "was poor."

About $6.7-billion has been spent or is already committed to the project.

Marshall says most problems stem from construction of the power plant. He says Nalcor is in "a major dispute" with construction contractor Astaldi Canada. He said it's the major uncertainty for Muskrat Falls but that talks continue.

Marshall says electricity rates for domestic customers are now expected to rise to 21.4 cents per kilowatt hour in 2021, before tax. That's up 6.3 cents from forecasts when the project was sanctioned in 2012.

Sales of available export power would bring those estimates down by less than a cent, Marshall predicted.

Consumers in the province paid about 12 cents per kilowatt hour last year before tax. That compares to almost 15 cents in Ontario and 16 cents in Nova Scotia.

Marshall says forecasted energy needs have decreased, but the province still needs a new source of power to replace the aging Holyrood plant and to meet future demand.

He predicts by the time Muskrat Falls comes onstream, consumers in the province will be paying among the highest rates in the country.

Still, Marshall – who took over just two months ago as CEO of the project, which was sanctioned by the former PC government – says it's too late to turn back.

"It was a gamble," Marshall said of energy price assumptions made when the project was approved.

"And it has gone against us."

The province is obligated to provide power to Nova Scotia utility Emera for 35 years. Nixing Muskrat Falls and myriad contracts would be far more expensive than forging ahead, he said.

"The project was too big for our needs," says Marshall. "We speculated, and we lost."

Premier Dwight Ball said he wouldn't go so far as to describe Muskrat Falls as a "boondoggle" as Marshall did.

But he said he can understand if people question why they should trust anything they hear from Nalcor Energy.

"I completely understand why people would look at the project and say: 'I've heard this before. It's political.' "We're going to see it past the finish line. Underpinning it will be reliable power at competitive prices."

Ball said he'll work with Marshall over the next four years to find ways to lower Muskrat Falls power rates for consumers.

"We've inherited this project. We've inherited the challenges that come with it."