Sure, if you know what meter to read. :-)
Let me think... my understanding is that a home needs ~4 kilowatts, give or take. So 1 MW draw would be equivalent to the power requirements for a couple hundred houses. Or perhaps equivalent to a middling-sized industrial facility. Drawing that amount of power without anyone noticing might be difficult but not impossible. Can anyone with experience in this area comment on that?
Remember that this is not electrical power that is being produced, but rather simple heat. To create 1 megawatt of heat requires about 37 gallons of propane per hour.
Thousand gallon tanks of propane are not unusual. Hidden natural gas pipes are not that difficult to create. As only heat is required, there are many ways to deliver it if the demonstration is not easily inspected from all sides.