I was surprised too at the 2nd sentence: "The project will have a heating power of 2MW and a thermal energy storage (TES) capacity of 250MW..."

and how a news outlet about energy could get such a fundamental unit wrong.

But given that later in the article it does revert to correct units (and the numbers are plausibly proportional), I assume it's just a typo. Strange that it hasn't been corrected even now.

"...It follows Polar Night Energy completing and putting a 1MW/100MWh Sand Battery TES project into commercial operations this summer..."