So I found this energy calculator and plugged in 24 hours a day usage (not standby, actual usage) for my monitor size and wattage and the local cost and it came out to about 1 kilowatt-hour per day, and around $35 for a year , check it out and play with the numbers yourself!
https://energyusecalculator.com/electricity_lcdleddisplay.htm
Modern displays in standby will need around 3 -10 W. Which is low compared to the tube displays we once had. But when we talk laptops even 3 W will drain your battery.
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