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RELATIONSHIP BETWEEN SUMMER AND DECEMBER PEAK LOADS

The relationship between the summer and Decem-
ber peak loads in the different power supply regions
of the country, and also in the country as a whole,
are shown in Table III where the summer peak load
in each case is expressed as a percentage of the
December peak load for the same calendar year. It
can be seen here that, in some regions, the magnitude
of the summer peak load is characteristically about
the same as the peak load during the following De-
cember. Therefore, the former expressed as a per-
centage of the latter gives a value close to 100 per-
cent. In those regions where the summer peak load
is characteristically higher than the peak during the
following December, the percentage figure is natur-
ally above 100 percent. This is true in particular in
Region V, where, due to climatic conditions, heavy
air conditioning loads during the summer months
cause peaks that far exceed those during the follow-
ing December.

TABLE III

In this region, it has not been possible to develop
electric heating loads during the winter months to
offset the heavy air conditioning loads in summer.

It is of interest to note, from the tabulation, the
gradual trend in most regions of the summer peak
load to approach or exceed the following December
peak. For the country as a whole, the summer peak
in the years 1962 and 1963 has been about the same
as the peak load in December. For the years 1964
through 1969, there has been a departure which
shows the summer peak exceeding and gaining
slightly on the December peak.

There was a slight exception to this trend in 1967
due chiefly to a cool period at the time of the usual
summer peak load. But the forecasts for the years
1970 through 1975 reflect the trend which was estab
lished prior to 1969 for the summer peak to exceed
the December peak by increasing amounts.

SUMMER PEAK LOADS EXPRESSED AS PERCENTAGE OF PEAK LOAD FOR THE FOLLOWING DECEMBER

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For 1975, shown in this survey for the first time,
the predicted output is 2.3 trillion kilowatt-hours.
It was only in 1965 that the total electric utility in
dustry output exceeded the one trillion kilowatt-hour
level. During that year, the total output was 1.06
trillion kilowatt-hours. If the present forecast for
year 1975 proves to be correct, the electrical output
of the industry will have more than doubled in ten
years. The annual increase in output during the six-
year period, 1970 through 1975, according to pres-
ent forecasts, is 7.8 percent.

Fig. 5 shows the total annual output for the entire
industry, starting with the year 1948 and including
the forecasts for the years 1970 through 1975. The
average annual increase for the entire period shown
in Fig. 5 is 8.0 percent.

Regional data for the years covered by the 47th
Semi-Annual Survey only are shown graphically in
Fig. 6.

FIG. 5 ELECTRIC ENERGY OUTPUT AND ANNUAL LOAD FACTORS-TOTAL ELECTRIC UTILITY INDUSTRY OF THE CONTIGUOUS UNITED STATES

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FIG. 6 REGIONAL ELECTRIC ENERGY OUTPUT AND ANNUAL LOAD FACTORS (SURVEY COVERAGE ONLY)

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ADDITIONS TO ELECTRIC GENERATING CAPACITY

The number and aggregate capacity of new electric
generating units placed in commercial operation dur-
ing the first quarter of 1970 are shown in the top
portion of Table VI. The distribution of these units
among the eight FPC power supply regions of the
United States is indicated in the second portion of
the table, while the third portion of the table presents
the same data classified according to ownership.

Table VII presents the number and aggregate
capacity of all new electric generating capacity on
order, as of April 1, 1970, and scheduled for com-
mercial operation during the last nine months of
1970 and later years. The second portion of the table
presents this same information on the basis of the

FPC power supply regions in which the new capacity
is to be installed, and the third portion of the table
classifies the information according to ownership.

Tables VI and VII include all steam turbine-
generators, for both fossil and nuclear-fueled plants,
conventional hydraulic turbine-generators and those
for pumped-storage plants, gas turbine-generators,
and diesel engine-generators, 4,000 kw and larger,
of both domestic and foreign manufacture.

Additional electric generating units aggregating
18 million kilowatts are also on order with the manu-
facturers, but they have not been included in Table
VII because scheduled dates of operation have not
been specifically established.

TABLE VI-ADDITIONS TO ELECTRIC GENERATING CAPACITY DURING FIRST THREE MONTHS OF 1970
In Terms of Manufacturers' Ratings of the Units

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1,425,822

1

1,130,000

2

53,174

1

17,500

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