Key Concepts
•
The resiliency of our communities depends on a steady, safe, and local
supply of water and power.
•
The primary source of San Francisco’s water—and some of its power—
is Hetch Hetchy reservoir and dam, supplemented by groundwater, and by
reusing and recycling other diverse sources, such as graywater
and blackwater.
•
By locally diversifying our water supply, we reduce the amount of water
we must bring from the Sierra Nevada mountain range.
•
No one method of electricity generation can meet our power needs;
we need a diversity of sources. For example, wind energy can only be
produced when it is windy, so we cannot rely solely on it for power.
BIG IDEAS
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Grades 6–8
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SAN FRANCISCO PUBLIC UTILITIES COMMISSION
63