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Gas and electric rates are regulated by state regulators following specific ratemaking rules and procedures. In Iowa, the regulatory body is the Iowa Utilities Board; in Illinois, the regulatory body is the Illinois Commerce Commission; and in South Dakota, the regulatory body is the South Dakota Public Utilities Commission. The city councils of South Sioux City and Dakota City regulate natural gas delivery service rates in Nebraska.

Each regulatory body follows the same general theory, allowing recovery of operating expenses. Utilities also are allowed to recover the costs of their capitalized assets like electric generating stations, natural gas distribution pipeline and electric substations. These costs are recovered over the estimated life of the assets. Utilities also are allowed to earn a fair return on their assets to compensate investors for capital investments. The rate of return on the investment is determined by the regulating body.

The total amount of the costs to be recovered and the return on investment equals the amount that a utility is entitled to recover in its rate and is spread over the total usage and customer base to establish a monthly customer charge and a rate per therm for natural gas or kilowatt-hour for electricity. The regulatory body in each state approves the allocation of these costs to each tariff.

MidAmerican Energy Company maintains a copy of each of its tariffs on its website.