New York, NY: 1913-1970 120mw World's Largest Sherman Creek Generating Station

(Satellite, ConEd still owns the property, but now it is a substation)

Of course, "the world's largest" applies to when it was built, not to now.

Andy Kapper posted two photos with the comment: "Colorized pictures of the Sherman Creek Generating Station in New York City, built in 1913, decommissioned in 1970, and unfortunately demolished in 1993 after 80 years of existence. More info and pictures: https://myinwood.net/inwoods-sherman-creek-power-generating-station/"

1, cropped

2

MyInwood, this site has several more photos
1951
This was built by the United Light and Power Company. It was "said to be the largest and most modern of its kind in the world." It generated just AC power.
Judging from one of the photos of the turbine hall, this plant had 8 units, each had "three giant 22,500 horsepower Westinghouse Parsons double flow turbines coupled directly to 15,000 kilowatt generators." So the capacity of the plant was 120mw.
Because of neighborhood complaints, equipment was added to reduce the amount of noise that was emitted from the plant. The plant sucked cooling water out of the Harlem River and dumped the heated water into Sherman's Creek. This hot water was the cause of a lawsuit.
The plant was torn down in 1997.

MyInwood
Boiler room

"The plant had many innovations and required only one-third the number of boilers of the other electricity-generating plants in the area. The plant had other modern advances, including the use of pulverized coal and a special water spray system that was put in place to catch cinders." [BelluckFox]

The plant received coal by barge instead of by rail.

dcmny, 1916

The capacity of at least some of the units were upgraded from 15mw to 22mw.

PeriodPaper