Lower power use of LEDs just means you can have a larger operation with the same electrical connection.

Also dehumidifiers/air conditioning makes up a big part of the energy use as well. The plants transpire a ton of humidity into the air, which has to go somewhere, and the lights create a ton of heat (even LEDs), which has to be lowered as well.

During flower your lights will also be turned on for exactly 12 hours, and then turned off for exactly 12 hours. That's an extremely easy pattern for a modern smart meter to recognize. Although that could be hidden somewhat by having a lot of small tents and staggering the timing of the lights, so they don't all turn on and off at the exact same time. Makes working on the plants a lot less convenient though, since you must never open the tent while the lights are turned off, as light exposure during the dark period can cause hermies, which will ruin your harvest