NEW YORK (Reuters) - Vistra Energy Corp (VST.N) and Dominion Energy Inc (D.N) – which serve about 5.5 million electricity customers in more than a dozen U.S. states – both say they are done building combined-cycle natural gas-fired power plants.

Instead, they are building large solar plants, which offer plentiful and inexpensive electricity.

This bearish view of fossil-fuel energy, reflective of a growing acceptance by utilities of renewable power sources, poses a hurdle to John Flannery’s plan to turn around General Electric Co’s (GE.N) $35 billion-a-year power unit.

GE’s chief executive spelled out the difficulty on Wednesday. Power profits will be flat this year after falling 53 percent in 2017, he said, and GE is planning that demand for heavy-duty natural gas power plants will be less than half what it forecast just over a year ago, and will stay at that level through 2020.

New plant sales are “going to be tough,” Flannery said at an investor conference on Wednesday. “This is not going to be a quick fix, but there is, at the end of the day, long-life assets here with intrinsic economic value. We’re going to make the most of what we have there.”

In the long run, Flannery and Russell Stokes, the head of GE Power, have said demand for electricity and natural gas power generators will grow about 2 percent a year - in line with global forecasts - as utilities make a gradual transition to renewable power.

Following a strategy he laid out in November, Flannery is cutting 12,000 jobs and $2.5 billion in costs at the unit. On Wednesday, he said GE has tripled some sales incentives in the power division and is competing aggressively for new contracts to maintain plants

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