Summary Of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2022

Schedule of Average Rates of Depreciation

The average rates of depreciation for electric, gas and other properties, consistent with current rate-making practices, were as follows:

	IPL			WPL
	2022	2021	2020	2022	2021	2020
Electric - generation	3.4%	3.4%	3.5%	3.4%	3.5%	3.5%
Electric - distribution	2.8%	2.9%	2.8%	2.5%	2.6%	2.6%
Electric - other	5.7%	5.7%	5.2%	6.8%	7.4%	6.1%
Gas	3.3%	3.3%	3.3%	2.4%	2.4%	2.4%
Other	6.1%	6.1%	6.3%	4.9%	5.4%	5.9%

In December 2021, the PSCW issued an order approving the implementation of updated depreciation rates for WPL effective January 1, 2023 as a result of a recently completed depreciation study. WPL estimates the new average rates of depreciation for its electric generation, electric distribution and gas properties will be approximately 3.6%, 2.7% and 2.9%, respectively, during 2023.

Schedule of Allowance for Funds Used During Construction Rate

The AFUDC rates, computed in accordance with the prescribed regulatory formula, were as follows:

	2022	2021	2020
IPL (Wind generation CWIP)	6.9%	7.0%	7.1%
IPL (other CWIP)	7.0%	7.2%	7.2%
WPL (retail jurisdiction)	7.0%	7.0%	7.0%
WPL (wholesale jurisdiction)	6.2%	5.6%	6.3%

IPL [Member]

Schedule of Average Rates of Depreciation

The average rates of depreciation for electric, gas and other properties, consistent with current rate-making practices, were as follows:

	IPL			WPL
	2022	2021	2020	2022	2021	2020
Electric - generation	3.4%	3.4%	3.5%	3.4%	3.5%	3.5%
Electric - distribution	2.8%	2.9%	2.8%	2.5%	2.6%	2.6%
Electric - other	5.7%	5.7%	5.2%	6.8%	7.4%	6.1%
Gas	3.3%	3.3%	3.3%	2.4%	2.4%	2.4%
Other	6.1%	6.1%	6.3%	4.9%	5.4%	5.9%

In December 2021, the PSCW issued an order approving the implementation of updated depreciation rates for WPL effective January 1, 2023 as a result of a recently completed depreciation study. WPL estimates the new average rates of depreciation for its electric generation, electric distribution and gas properties will be approximately 3.6%, 2.7% and 2.9%, respectively, during 2023.

Schedule of Allowance for Funds Used During Construction Rate

The AFUDC rates, computed in accordance with the prescribed regulatory formula, were as follows:

	2022	2021	2020
IPL (Wind generation CWIP)	6.9%	7.0%	7.1%
IPL (other CWIP)	7.0%	7.2%	7.2%
WPL (retail jurisdiction)	7.0%	7.0%	7.0%
WPL (wholesale jurisdiction)	6.2%	5.6%	6.3%

WPL [Member]

Schedule of Average Rates of Depreciation

The average rates of depreciation for electric, gas and other properties, consistent with current rate-making practices, were as follows:

	IPL			WPL
	2022	2021	2020	2022	2021	2020
Electric - generation	3.4%	3.4%	3.5%	3.4%	3.5%	3.5%
Electric - distribution	2.8%	2.9%	2.8%	2.5%	2.6%	2.6%
Electric - other	5.7%	5.7%	5.2%	6.8%	7.4%	6.1%
Gas	3.3%	3.3%	3.3%	2.4%	2.4%	2.4%
Other	6.1%	6.1%	6.3%	4.9%	5.4%	5.9%

Schedule of Allowance for Funds Used During Construction Rate

The AFUDC rates, computed in accordance with the prescribed regulatory formula, were as follows:

	2022	2021	2020
IPL (Wind generation CWIP)	6.9%	7.0%	7.1%
IPL (other CWIP)	7.0%	7.2%	7.2%
WPL (retail jurisdiction)	7.0%	7.0%	7.0%
WPL (wholesale jurisdiction)	6.2%	5.6%	6.3%