Some things haven't changed since Builder reported on the U.S. Energy Information Administration's "Electric Sales, Revenue, and Average Price" report in December 2013— residential consumers still account for the majority of sales by end-use sector (residential, commercial, industrial, and transportation), and the residential sector still pays the most cents per Kilowatthour for electricity. Price, however, has changed. In fact, the average price of electricity to ultimate residential customers (nationally) recorded for May 2014 is the highest recorded for any month in the past two years, and increased 3.4% year-over-year. 

May 2012: 11.90 cents per Kilowatthour
May 2013: 12.42 cents per Kilowatthour
May 2014: 12.84 cents per Kilowatthour

The dense "Electric Power Monthly" report released last month by the U.S. Energy Information Administration also identifies the average retail price of electricity to customers in every U.S. region and state year-over-year for the month of may. 

The hierarchy in the treemap below displays the average retail price for electricity (cents/Kilowatthour) in May 2014 from lowest to highest price in every U.S. state.

CHEAT SHEET

Five Most Expensive States:

1.  Hawaii:38.04 cents/kWh
2.  New York:20.62 cents/kWh
3.  Connecticut:20.18 cents/kWh
4.  Alaska:19.84 cents/kWh
5.  Vermont:18.18 cents/kWh

Five Least Expensive States:

1. Washington:8.93 cents/kWh
2. Idaho:9.64 cents/kWh
3. West Virginia:9.71 cents/kWh
4. North Dakota:10.02 cents/kWh
5. Arkansas:10.07 cents/kWh

U.S. Regions with Highest Price Hikes Y-o-Y:

1. New England:11.31% increase
    May 2013: 16.35 cents/kWh
    May 2014: 18.17 cents/kWh

2. Middle Atlantic: 5.53% increase
    May 2013: 16.60 cents/kWh
    May 2014: 15.73 cents/kWh

3. Pacific Nonontiguous: 5.04% increase
    May 2013: 29.16 cents/kWh
    May 2014: 30.63 cents/kWh

4. Mountain: 4.80% increase
    May 2013: 11.45 cents/kWh
    May 2014: 12.00 cents/kWh

5. East South Central: 4.17% increase
    May 2013: 10.80 cents/kWh
    May 2014: 11.25 cents/kWh

6. South Atlantic: 3.38% increase
    May 2013: 11.54 cents/kWh
    May 2014: 11.93 cents/kWh

7. West North Central: 2.79% increase
    May 2013: 11.45 cents/kWh
    May 2014: 11.77 cents/kWh

8. West South Central: 2.53% increase
    May 2013: 11.07 cents/kWh
    May 2014: 11.35 cents/kWh

9. East North Central: 2.12% increase
    May 2013: 12.74 cents/kWh
    May 2014: 13.01 cents/kWh

10. Pacific Contiguous: 1.69% increase
    May 2013: 13.65 cents/kWh
    May 2014: 13.88 cents/kWh

For a breakdown of average cost/kWh for all 50 states in May 2014 or year-over-year,  refer to Table 5.6.A of the EIA's Electric Power Monthly report >>