I'm not sure whether you're agreeing with me or not, and in a way that's why people shouldn't just use large numbers and then act like they've said something meaningful.
Ratios matter, large numbers without a relevant basis for comparison on the other hand are just misleading. There are roughly 116 million households in the US, saving the energy of 7,500 is not a big change.
You're solving roughly 1 - 15,466 th of the problem. And that's assuming that all the savings could even be applied to the US, which they most certainly couldn't.
That's not a big impact. Chances are no-one - even if they were looking - could notice the figurative needle move on a change that small at all the power-stations serving the aggregated demand.