Considering all of the errors and mistakes government makes, the post about A Flock of Seagulls seems to be a perfect case of the pot calling the kettle black. (Not to mention that there is no such animal as a seagull).
An electric heater rated at 1000 watts (1 kilowatt), operating for one hour uses one kilowatt-hour (equivalent to 3.6 megajoules) of energy. A television rated at 100 watts operating for 10 hours continuously uses one kilowatt-hour. A 40-watt light bulb operating continuously for 25 hours uses one kilowatt-hour.
A watt is one joule per second. A kilowatt-hour is therefore one thousand joules per second applied for one hour (3600 seconds), or 3,600,000 joules. A 3000W heater is a 3 kW heater. If it operates for 30 minutes, it is using 3 kW * 0.5 hours, or 1.5 kWh (NOT 1500 kWh).