The scheme on the Hudson River, revealed in an AJ exclusive last year (AJ 06.07.06), is Alsop's first project in the United States.
However, the ambitious new designs (pictured above), presented to local residents a few days ago, include a number of significant alterations from the initial proposals (pictured below).
The 25-storey residential tower, which will sit on top of the 8,000m2 main power-station block, was originally intended to overhang the existing red-brick structure and be partially supported on one side by stilts.
But in the new proposals the 400-apartment tower will be 'squarer', with the power house below resulting in the loss of the station's iconic twin chimneys - to the dismay of some residents.
Plans to build a red museum block jutting out over the river have also been altered, though a new contemporary-art museum building will still be built in a former switch-house.
Perhaps the most significant change in the project, which has already ballooned in costs from £100 million to nearly £250 million, is the creation of a brand-new tower on the rear of the plot, which will house additional retail units.
Speaking about the removal of the chimney stacks, a spokesman for the practice said: 'The stacks will, sadly, need to be removed as structural investigations have revealed that their foundations are corroded and the entire roof assembly is extremely unstable. The cost to maintain the chimneys has become prohibitive.'