Clarifying further:

Megawatts are a unit of power. Think of the size of the engine in a car.

Megawatt-hours are a unit of energy. Think of the size of a fuel tank.

Both units are useful: if you run a 1 MW load (a synonym, mostly, for power) for an hour, you'll use one MWh of energy, and have to fuel or pay equivalently.

But increasing the size of your gas tank won't make your car more powerful, and increasing the engine size won't let you drive further between fuel stops.[1]

That serious information outlets still confuse the terms is a bit sad really.

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Notes:

1. Pedants, I love you, welcome to Costco. But I'm excluding second-order effects, which tend regardless to be in the opposite directions.