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Re: Electric cars got even cleaner in a year, new grid data shows

Posted: Tue Mar 10, 2020 6:09 pm
by GRA
GCC:
CARB publishes 2020 CI values for electricity as transportation fuel: average 82.92 gCO2e/MJ, up from 2019
https://www.greencarcongress.com/2020/0 ... arbci.html

The California Air Resources Board (CARB) Executive Officer has certified the 2020 annual update to the carbon intensities (CI) of the lookup table pathways for a) California Average Grid Electricity Used as a Transportation Fuel in California and b) Electricity Supplied under the Smart Charging or Smart Electrolysis Provision.

The updated pathway CI values are available for quarterly fuel reporting under the Low Carbon Fuel Standard (LCFS) in 2020, beginning with Q1.

The CI of California average grid electricity used as a transportation fuel in California for 2020 is 82.92 gCO2e/MJ. This represents a slight increase over the CI of 81.49 gCO2e/MJ used in 2019.

The CI for the smart charging or smart electrolysis provision varies by time of day (using an hourly window) and quarter. It ranges from a low of 27.30 gCO2e/MJ for the window from 12:01 pm to 2:00 pm in Q1 to a high of 143.40 gCO2e/MJ from 7:01 to 8:00 pm in Q3. . . .

The current certified average CI—based on the average crude oil supplied to California refineries and average California refinery efficiencies—of CARBOB—the standard grade of gasoline supplied to the California market— is 100.82 gCO2e/MJ.

There's a chart, which only runs through 2018. Looking at that, the reason for the increase appears to be a decrease in large hydro and an increase in NG. All the renewables are also up. Direct link to report: https://ww3.arb.ca.gov/fuels/lcfs/fuelp ... ovdelivery

Re: Electric cars got even cleaner in a year, new grid data shows

Posted: Tue Mar 10, 2020 6:30 pm
by Oilpan4
Who uses electricity by the mega joule?
Do they not want to say 300 grams per kwh?

Re: Electric cars got even cleaner in a year, new grid data shows

Posted: Tue Mar 10, 2020 6:33 pm
by GRA
Since energy is measured in joules and watts are a conversion on top of all the other conversions due to type of generating source and its efficiency, I imagine it's easier to calculate gCo2e in (mega)joules.

Re: Electric cars got even cleaner in a year, new grid data shows

Posted: Tue Mar 10, 2020 7:52 pm
by lorenfb
GRA wrote:
Tue Mar 10, 2020 6:33 pm
Since energy is measured in joules and watts are a conversion on top of all the other conversions due to type of generating source and its efficiency, I imagine it's easier to calculate gCo2e in (mega)joules.
Energy = Integral of Power (watts) over time, e.g. kWh, joule - watt-second.

Re: Electric cars got even cleaner in a year, new grid data shows

Posted: Wed Mar 11, 2020 5:47 pm
by GRA
Uh huh, the SI unit of energy is the joule.