Table 1. Annual Electricity Consumption Percentiles by Year Constructed, 1997
(kilowatthours per household)
| |
5th percentile |
10th percentile |
25th percentile |
median |
75th percentile |
90th percentile |
95th percentile |
| All Households |
2,287 |
3,167 |
5,056 |
8,370 |
13,485 |
19,866 |
24,436 |
| Year Constructed |
|
| Before 1940 |
1,778 |
2,369 |
3,867 |
6,363 |
10,256 |
14,369 |
18,355 |
| 1940 to 1949 |
1,778 |
2,212 |
3,574 |
5,940 |
9,660 |
14,945 |
19,452 |
| 1950 to 1959 |
2,345 |
3,070 |
4,651 |
7,556 |
11,234 |
17,193 |
22,229 |
| 1960 to 1969 |
2,374 |
3,172 |
4,912 |
7,969 |
12,032 |
18,267 |
21,976 |
| 1970 to 1979 |
2,311 |
3,336 |
5,925 |
10,039 |
15,976 |
23,422 |
27,933 |
| 1980 to 1989 |
3,723 |
4,738 |
7,156 |
10,950 |
16,555 |
22,312 |
26,137 |
| 1990 to 1997 |
3,518 |
4,283 |
7,281 |
10,815 |
16,860 |
21,812 |
24,893 |
Graph of data
Notes: The data in this table are for households that used electricity.
The percentiles describe the distribution of household electricity consumption data; for example, 25% of households in units constructed before 1940 consumed less than 3,867 kWh and 75% consumed more than that amount.
Source: 1997 Residential Energy Consumption Survey.
Return to: “Median Values and Percentiles for Household Energy Data”
Table 2. Mean Annual Electricity Consumption by Year Constructed, 1997
(kilowatthours per household)
| |
Electricity Consumption per Household
(kWh) |
Relative Standard Error (percent) |
Standard Error (kWh) |
95% confidence level lower bound (kWh) |
95% confidence level upper bound (kWh) |
| All Households |
10,219 |
1.4 |
430 |
9,939 |
10,499 |
| Year Constructed |
|
| Before 1940 |
7,781 |
2.6 |
202 |
7,384 |
8,177 |
| 1940 to 1949 |
7,641 |
4.8 |
367 |
6,922 |
8,359 |
| 1950 to 1959 |
9,033 |
3.0 |
271 |
8,502 |
9,564 |
| 1960 to 1969 |
9,459 |
3.1 |
293 |
8,884 |
10,034 |
| 1970 to 1979 |
11,976 |
2.9 |
347 |
11,295 |
12,657 |
| 1980 to 1989 |
12,449 |
2.6 |
324 |
11,814 |
13,083 |
| 1990 to 1997 |
12,512 |
4.4 |
551 |
11,433 |
13,591 |
Graph of data
Notes: The data in this table are for households that used electricity.
The standard error is a measure of sampling error and can be used to calculate a confidence range. For example, the estimate for electricity consumption in units constructed before 1940 is 7,781 kilowatthours (kWh) and the standard error is 202 kWh. The 95% confidence interval is calculated by multiplying 1.96 times the standard error, and the 95% confidence range is 7,384 kWh to 8,177 kWh.
Source: 1997 Residential Energy Consumption Survey.
Return to: “Median Values and Percentiles for Household Energy Data”
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