Adding a value to 2 rows based on 1 row

So, i have a table like this which has the energy consumption reading for different energy type. 

When there is a shutdown in the plant, the gas reading drops immediately, so whenever the gas reading is below 3, it indicates that there was a shutdown.

What i want to do is calculate the energy consumption when the machine was running, which means i have to subtract the Gas, Steam and Electricity reading during the shutdown from the total energy consumption of the day.

So, i want the SD value to be 1 for both steam and electricity at all the Date and Time instances when Gas is below 3 or SD is 1. And since i am new to PowerBI, i really dont have much idea on what to do to be honest.

I hope the question is clear, and any help would be really really be helpful for me. 

Thanks in advance!