Coal is the predominant source of electricity generation in Ninth
District power plants. Over 70 percent of electricity produced by
district utilities comes from coal-fueled generators. By comparison,
coal provides 56 percent of electricity nationwide. Hydroelectric
and nuclear power each produce about 13 percent of district electricity.
Renewable sources of energy other than hydroelectric (for example,
wind power) provide only 0.4 percent of electricity generation.
Coal is the main energy source in all states except South Dakota,
where electricity is primarily generated by hydroelectric power.
Source: Energy Information Administration
Carbon dioxide emissions per unit of electricity generated have
decreased from 1988 to 1998 in Montana, North Dakota and South Dakota,
while edging up in Minnesota and Wisconsin. North Dakota has the
highest level of carbon dioxide emissions per unit of electricity
in the district, and the highest proportion of electricity powered
by coal. In contrast, South Dakota has the lowest level of carbon
dioxide emissions per unit of electricity and the least reliance