266 KW how many amps?

Watts = current x volts for a resistive load. You need to know a voltage to calculate amps. If it is a 120 VAC residential voltage it would be a whopping 266,000/120 = A or 2,216.7 Amps. If it is 240 VAC then half that. To put that in perspective the service to a typical residence might be between 100 and 200 Amps.