Currently, there are estimated to be 3,000-4,000 individual nodes, so 10,000 is a conservative estimate for post-merge): 1.44kWh daily usage * 10,000 network nodes = 14,400kWh per day . There are 86,400 seconds in a day, so 14,400 / 86,400 = 0.1667 kWh per second.