indyflick
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Re: 7.5 kWh of electricity to produce a gallon of gasoline?

Thu Jul 22, 2010 11:15 am

I just found a more precise statistic on gasoline % refined in 2005 in the US. It's 46.2% of all refined productes. So that means US oil refineries used 22,587,642,000 kWh of electricity in 2005 to produce gasoline.

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evnow
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Re: 7.5 kWh of electricity to produce a gallon of gasoline?

Thu Jul 22, 2010 11:17 am

Some stats here on how much refining was done in the US - about 16 mbpd in 2005. Some 6% of gasoline is imported.

http://www.econbrowser.com/archives/200 ... on_ab.html
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Re: 7.5 kWh of electricity to produce a gallon of gasoline?

Thu Jul 22, 2010 11:35 am

Apparently refineries account for 7.5% of the US energy consumption, not electricity.
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Re: 7.5 kWh of electricity to produce a gallon of gasoline?

Thu Jul 22, 2010 11:38 am

Here's an interesting, sort of related, article about electricity production in California.

http://www.sfgate.com/cgi-bin/article.c ... type=autos

indyflick
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Re: 7.5 kWh of electricity to produce a gallon of gasoline?

Thu Jul 22, 2010 1:08 pm

UPDATE... I divided incorrectly in the last step. As pointed out by Rik and evnow, the analysis below is not correct. This analysis actually indicates 22,587,642,000 kWh / 132,488,160,000 gallons of gasoline = 0.17 kWh per gallon of gasoline in the refining process.

----------------------------------------------------------------------------------------------------------------------



Based on my personal analysis the shows that in 2005 US oil refineries consumed 5.86 kWh of electricity for every gallon of gasoline they produced. That same electricity could instead propel a Nissan Leaf over 20 miles.

Analysis and links

Electricity consumption by petroleum refineries in the US in 2005 was 48,891,000,000 kWh
http://www.nationmaster.com/graph/ene_e ... ies#source

Gasoline composed 46.2% of all US refined oil products in 2005
http://tonto.eia.doe.gov/dnav/pet/pet_p ... _pct_a.htm

Therefore, we take 46.2% of the total electricity used by the US refineries in 2005 for galoline production. So that would be 22,587,642,000 kWh of electricity. (48,891,000,000 kWh * .462)

In 2005 US refineries produced 132.4 billion gallons of gasoline
http://www.eia.gov/dnav/pet/hist/LeafHa ... frpus2&f=w

Download the spreadsheet and use the 2005 data on gasoline production. The data is the weekly U.S. Refinery and Blender Adjusted Net Production of Finished Motor Gasoline (Thousand Barrels per Day). So you need to add up the weekly totals, multiply by 7 to get the full weeks, multiply by 1000 (data is thousands), and multiply by 42 because there are 42 gallons in a barrel. That gets you to 132,488,160,000 gallons.

132,488,160,000 gallons of gasoline / 22,587,642,000 kWh = 5.86 kWh of electricity consumed for every gallon of gasoline produced in the US in 2005.

I would still like to know how Nissan came up with their 7.5 kWh of electricity consumed for every gallon of gasoline produced. I doubt refineries have become less efficient over the last five years. But I feel like this quick, back of the napkin analysis, could defend the assertion that at least 5 kWh of electricity is consumed for every gallon of gasoline produced. And the data shows that gasoline production consumes far more electricity than most people realize.
Last edited by indyflick on Tue Jul 27, 2010 8:53 am, edited 1 time in total.

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evnow
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Re: 7.5 kWh of electricity to produce a gallon of gasoline?

Thu Jul 22, 2010 1:50 pm

indyflick wrote:I would still like to know how Nissan came up with their 7.5 kWh of electricity consumed for every gallon of gasoline produced. I doubt refineries have become less efficient over the last five years.
Refineries generally have various sources of energy for refining. They use the cheapest option in any given location & time. The main sources are electricity & natural gas. While electricity rates are controlled and stable, NG rates are not. This makes decision on using NG vs electricity dependent on market rates of NG. Mix of electricity & NG used varies with market rates. NG ofcourse can be used to produce fairly clean electricity. So, it is important to find out total energy used in refining rather than just electricity.
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Re: 7.5 kWh of electricity to produce a gallon of gasoline?

Thu Jul 22, 2010 2:33 pm

So, it is important to find out total energy used in refining rather than just electricity.
I see what you're saying but that is a different analysis. For this analysis I only want the electricity usage. I'm analyzing a past event, I'm not concerned with what the refiners may or may not do in the future due to NG pricing. I understand that if NG pricing goes up, the refiners will move to electricity.

So, in this case, while including the refiners use of NG makes the case even stronger for the BEV, it makes the message more complex because consumers know the BEV can't directly run on NG.

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evnow
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Re: 7.5 kWh of electricity to produce a gallon of gasoline?

Thu Jul 22, 2010 2:59 pm

Some discussions on this.

http://www.teslamotorsclub.com/showthread.php?t=475

I'll spend a bit of time on this and get some data. There is a ton of data at EIA, IEA, BP etc.
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Re: 7.5 kWh of electricity to produce a gallon of gasoline?

Thu Jul 22, 2010 3:00 pm

indyflick wrote:I doubt refineries have become less efficient over the last five years.
I wouldn't be surprised if it had, especially as crude oil gets more "sour" as the light crude runs out.

indyflick
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Re: 7.5 kWh of electricity to produce a gallon of gasoline?

Thu Jul 22, 2010 3:56 pm

evnow wrote:Some discussions on this.

http://www.teslamotorsclub.com/showthread.php?t=475

I'll spend a bit of time on this and get some data. There is a ton of data at EIA, IEA, BP etc.
Nice find. Appears that group have been struggling with question for three years. To your point, it's going to change a bit year over year as the refineries arbitrage electricity and NG. I feel comfortable with the 2005 statistic but I wish we had 2004 through 2009. Then we could average them and go with that.

Again, if Nissan could provide their analysis and sources it would be helpful.

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