Sounds like the article used just the right wording then. “…less land area per megawatt-hour than almost any other power source.” As I read it this implies the

Sounds like the article used just the right wording then. “…less land area per megawatt-hour than almost any other power source.” As I read it this implies there is one (or some very small percentage) power source which uses less land per megawatt-hour, which is exactly the case.