What is load shifting?
Load shifting is as basic as storing energy and using it at a later stage. Here are a few examples of load shifting.
Multi tariff shifting
Let’s say Fred and Jan’s family have off-peak electricity tariff between 11 pm – 7 am at 12c per a kW/h of electricity used.
Now when Fred and Jan’s family wake up at 7 am, electricity is now at a peak tariff rate at 30c per a kW/h. Ironically this is when they really start to consume power. While Fred and Jan wake, shower, cook breakfast etc. they have consumed 4kW/h of electricity.
By introducing a form of energy storage, we will use batteries for this example, Fred and Jan’s Home energy system would charge batteries between the hours of 11 am – 7 am. Then instead of taking power from the grid at a higher tariff when they wake. Fred and Jan would use the power from the batteries, which they stored at over half the rate.
Renewable generation shifting
Brain and Robyn have recently installed a 5kW solar power system. They both leave for work at 8 am and no one is home until 4 pm. On average they consume 19kW/h of energy a day.
Brain and Robyn live in Melbourne, Victoria and the average output for a 5kW solar system is 20kW/h. Majority of Brain and Robyn’s consumption is between 6 am – 8 am and 4 pm – 10 pm. Unfortunately, 70% of the solar they generate is sold to the grid at a much lower rate then what they buy it at.
By introducing a form of energy storage, Fred and Jan’s home solar system would charge the batteries with all the excess power generated. Then instead of taking power from the grid at a higher tariff when they wake and when they get home from work. Brain and Robyn would use the power from the batteries, which they stored by the solar power system on their roof.