The article said the home was consuming 4,558 kilowatt hours per month. That's a HUGE amount of energy for a residence. For just a few plants you won't need anything larger than, say, 1000 watts of HPS lighting, and that works out to a mere 360 kWh per month extra on 12/12. No one's going to notice that. A large window air conditioner uses roughly the same amount under normal conditions.