The 'Race Ratio' is the percent of people of a race within X miles of the power plant divided by the national median (Census 2010). If the ratio is greater than 1 that means that people of that race are disportionately located within X miles of that type of power plant.

The Income Ratio is the weighted average of median household income (ACS 2007-2011 5 year average) of people within x miles of the power plant divided by the national median. If the ratio is lower than 1, that means that low-income people are disproportionately located within X miles of that power plant.

Geographical units: Below 10 miles for race I use blocks. From 10 miles to 99.99 miles for race I use block groups. For 100+ miles (race) and for all distances for income I use census tracts.

Location Count: 14810

 Distance (in miles)
Race1525100
American Indian10.978.865.844.3
Asian1.522.393.123.85
Black2.373.664.374.97
Hispanic16.4220.2823.0628.76
Multi-Racial2.793.033.253.47
White67.5863.5662.2356.93
Race Pop314k9,398k376,717k9062m
 
Income$50k$57k$56k$56k
Income Pop117k7,380k370,825k9062m

Note: for the larger distances the total population will exceed that of the US as people who live near multiple facilities are counted once for each facility.
The Race Pop is all of the people in that radius. The Income Pop is all of the people who have income data in that radius (for small distances this can be less than Race Pop as we are using a larger unit of analysis - census tracts vs blocks/block groups).
Execution time: 789 seconds
Credits: JusticeMap.org, Energy Justice Communities Map, Census Bureau (2010 Census and 2007-2011 American Community Survey).

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