We haven't seen 9-cent electricity since 2003 and aren't likely to ever again, and doubling generating capacity will take well into the 2040s, twenty more years.
Piped utility gas costs 15% more on average than when he spoke, while the average price of gasoline is basically flat but falling.
We'll get updated data this week maybe, since despite the shutdown the administration is pledging to report the consumer price index figures.
But the main point is, Trump has no idea what he's talking about.