To determine how much CO2 pollution is saved when using an EV with a 72 kWh battery charged from the normal grid, we need to compare the CO2 emissions of the EV to those of a conventional gasoline vehicle over a similar driving range. Here's the step-by-step calculation:
1. CO2 Emissions from Charging an EV
First, calculate the CO2 emissions from charging the 72 kWh battery using the grid's average emissions factor. For this example, let's assume the average emissions factor is 0.43 kg CO2 per kWh (as derived earlier).
2. Driving Range of the EV
Assume the EV has an efficiency of about 0.20 kWh per mile (this is a typical efficiency for many EVs). The driving range with a 72 kWh battery can be calculated as:
Driving range=72 kWh0.20 kWh per mile
3. CO2 Emissions from a Gasoline Vehicle
Next, calculate the CO2 emissions from a conventional gasoline vehicle over the same driving range. Assume the gasoline vehicle has a fuel efficiency of 25 miles per gallon (MPG) and burning one gallon of gasoline emits about 8.89 kg of CO2.
First, find out how many gallons of gasoline are needed to drive 360 miles: 14.4gallons
Then, calculate the CO2 emissions:
Total CO2 emissions=14.4 gallons×8.89 kg CO2 per gallon=128.016kg CO2
4. CO2 Pollution Saved
Finally, determine the CO2 pollution saved by using the EV instead of the gasoline vehicle: 97.056kg CO2
Conclusion
Using an EV with a 72 kWh battery charged from the normal grid can save approximately 97.056 kg of CO2 emissions over a driving range of 360 miles compared to a conventional gasoline vehicle with an average fuel efficiency of 25 MPG.