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*250GW of PV is installable on existing rooftops - Cosservative estimate (50% of residential rooftops) - [http://www.nrel.gov/docs/fy09osti/44073.pdf] | *250GW of PV is installable on existing rooftops - Cosservative estimate (50% of residential rooftops) - [http://www.nrel.gov/docs/fy09osti/44073.pdf] | ||
:*Per year, let's take average insolation as 6 hours per day * 365 days - or 550 TWhr per year. That is 2% of USA's energy use, or 5% of USA's electric use. This is JUST RESIDENTIAL ROOFTOPS. Needs to add commercial rooftops, parking lots, roadway medians. | :*Per year, let's take average insolation as 6 hours per day * 365 days - or 550 TWhr per year. That is 2% of USA's energy use, or 5% of USA's electric use. This is JUST RESIDENTIAL ROOFTOPS. Needs to add commercial rooftops, parking lots, roadway medians. | ||
*USA road density - 67 km/ 100 sq km of area. | *USA road density - 67 km/ 100 sq km of area - [http://data.worldbank.org/indicator/IS.ROD.DNST.K2] | ||
*USA area - 10 million sq km | *USA area - 10 million sq km | ||
*USA roads - 6.7 million km. Assume an average road is 2 lane with shoulder - each lane has 12 foot (3.7m) standard in the USA - [http://en.wikipedia.org/wiki/Lane] - or an area of | *USA roads - 6.7 million km. Assume an average road is 2 lane with shoulder - each lane has 12 foot (3.7m) standard in the USA - [http://en.wikipedia.org/wiki/Lane] - or an area of about 100,000 sq km. This could power 1/4 of the world's energy needs (oil, nukes, eaTaeri | ||
*Area required to power all of the world with PV is 400,000 sq km - [http://landartgenerator.org/blagi/archives/127] | *Area required to power all of the world with PV is 400,000 sq km - [http://landartgenerator.org/blagi/archives/127] | ||
Revision as of 22:44, 24 December 2014
- World Military Spending - $1.7T
- USA Military Spending - $640B - $2k per capita spending
- $40B organics market - http://www.ers.usda.gov/topics/natural-resources-environment/organic-agriculture/organic-market-overview.aspx. That makes it
- Annual sustainable forest yield of 12.5B cubic meters or 105 exajoules - [1], p. 615
- Annual energy use by USA - 94 exajoules
- US energy consumption by sector - 40% electricity, 30% transportation - [2]
![[2]](http://en.wikipedia.org/wiki/Energy_in_the_United_States#mediaviewer/File:US_Energy_Consumption_by_Sector_2007.PNG){kind=link}
- Total USA energy use - 25 PWhr - [3] - (petawatt hours (See Metric Prefixes))
- Equivalent to 90 exajoules, consistent with Renewable Energy "Blue Bible" above.
- 250GW of PV is installable on existing rooftops - Cosservative estimate (50% of residential rooftops) - [4]
- Per year, let's take average insolation as 6 hours per day * 365 days - or 550 TWhr per year. That is 2% of USA's energy use, or 5% of USA's electric use. This is JUST RESIDENTIAL ROOFTOPS. Needs to add commercial rooftops, parking lots, roadway medians.
- USA road density - 67 km/ 100 sq km of area - [5]
- USA area - 10 million sq km
- USA roads - 6.7 million km. Assume an average road is 2 lane with shoulder - each lane has 12 foot (3.7m) standard in the USA - [6] - or an area of about 100,000 sq km. This could power 1/4 of the world's energy needs (oil, nukes, eaTaeri
- Area required to power all of the world with PV is 400,000 sq km - [7]