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Regulatory Environment - NSG 2021 Rate Order (Details) - Illinois Commerce Commission (ICC) - 2021 Rate order - NSG $ in Millions | 1 Months Ended
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Sep. 30, 2021 USD ($)
Public Utilities, General Disclosures |
Approved rate increase | $ 4.1
Approved rate increase (as a percent) | 4.50%
Approved return on equity (as a percent) | 9.67%
Approved common equity component average (as a percent) | 51.58%

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