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Regulatory Matters (Tables) | 12 Months Ended
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Dec. 31, 2018
Regulatory Assets and Liabilities Disclosure [Abstract] |
Regulatory Assets | Regulatory assets were comprised of the following items:
At December 31, (in millions) | 2018 |  | 2017
Regulatory Assets |  |  |
Unrecognized pension and other postretirement benefit costs (see Note 11) | $ | 798.3 |  |  | $ | 733.5 |
Deferred pension and other postretirement benefit costs (see Note 11) | 74.1 |  |  | 70.7 |
Environmental costs (see Note 18-D) | 61.5 |  |  | 63.4 |
Regulatory effects of accounting for income taxes (see Note 1-N and Note 10) | 233.1 |  |  | 238.8 |
Under-recovered gas and fuel costs (see Note 1-K) | 34.7 |  |  | 25.5 |
Depreciation | 209.6 |  |  | 181.0 |
Post-in-service carrying charges | 206.6 |  |  | 173.3 |
Safety activity costs | 91.7 |  |  | 66.5 |
DSM programs | 45.5 |  |  | 40.0 |
Bailly Generating Station | 244.3 |  |  | — |
Other | 238.1 |  |  | 208.5 |
Total Regulatory Assets | $ | 2,237.5 |  |  | $ | 1,801.2 |
Regulatory Liabilities | Regulatory liabilities were comprised of the following items:
At December 31, (in millions) | 2018 |  | 2017
Regulatory Liabilities |  |  |
Over-recovered gas and fuel costs (see Note 1-K) | $ | 32.0 |  |  | $ | 27.6 |
Cost of removal (see Note 7) | 1,076.0 |  |  | 1,096.8 |
Regulatory effects of accounting for income taxes (see Note 1-O and Note 10) | 1,428.3 |  |  | 1,563.4 |
Deferred pension and other postretirement benefit costs (see Note 11) | 62.7 |  |  | 59.0 |
Other | 61.0 |  |  | 48.8 |
Total Regulatory Liabilities | $ | 2,660.0 |  |  | $ | 2,795.6 |
Schedule of Regulatory Programs | The following table describes regulatory programs to recover infrastructure replacement and other federally-mandated compliance investments currently in rates and those pending commission approval:
(in millions) |  |  |  |  |
Company | Program | Incremental Revenue | Incremental Capital Investment | Investment Period | Filed | Status | Rates Effective
Columbia of Ohio | IRP - 2018(1) | $ | 2.3 |  | $ | 207.0 |  | 1/17-12/17 | February 27, 2018 | Approved April 25, 2018 | May 2018
NIPSCO - Gas | TDSIC 7 | $ | 1.5 |  | $ | 59.0 |  | 1/17-6/17 | August 31, 2017 | Approved December 28, 2017 | January 2018
NIPSCO - Gas | TDSIC 8 | $ | 1.8 |  | $ | 54.0 |  | 7/17-12/17 | February 27, 2018 | Approved August 22, 2018 | September 2018
NIPSCO - Gas | TDSIC 9(1)(2) | $ | (10.6 | ) | $ | 54.4 |  | 1/18 - 6/18 | August 28, 2018 | Approved December 27, 2018 | January 2019
NIPSCO - Gas | FMCA 1 | $ | 9.9 |  | $ | 1.5 |  | 11/17-9/18 | November 30, 2018 | Order Expected Q1 2019 | April 2019
Columbia of Massachusetts | GSEP - 2018(1)(3) | $ | 6.5 |  | $ | 80.0 |  | 1/18-12/18 | October 31, 2017 | Approved April 30, 2018 | May 2018
Columbia of Massachusetts | GSEP - 2019(4) | $ | 10.7 |  | $ | 64.0 |  | 1/19-12/19 | October 31, 2018 | Order expected Q2 2019 | May 2019
Columbia of Pennsylvania | DSIC - 2018 | $ | 0.4 |  | $ | 14.8 |  | 12/17-2/18 | March 22, 2018 | Approved March 29, 2018 | April 2018
Columbia of Pennsylvania | DSIC - 2018 | $ | 0.9 |  | $ | 31.8 |  | 3/18-5/18 | June 20, 2018 | Approved June 28, 2018 | July 2018
Columbia of Pennsylvania | DSIC - 2018 | $ | 1.6 |  | $ | 55.4 |  | 6/18-8/18 | September 20, 2018 | Approved September 28, 2018 | October 2018
Columbia of Virginia | SAVE - 2018 | $ | 2.9 |  | $ | 33.3 |  | 1/18-12/18 | August 18, 2017 | Approved December 13, 2017 | January 2018
Columbia of Virginia | SAVE - 2019 | $ | 2.4 |  | $ | 36.0 |  | 1/19-12/19 | August 17, 2018 | Approved October 26, 2018 | January 2019
Columbia of Kentucky | AMRP - 2018 | $ | 4.5 |  | $ | 24.0 |  | 1/18-12/18 | October 13, 2017 | Approved December 22, 2017 | January 2018
Columbia of Kentucky | AMRP - 2019 | $ | 3.6 |  | $ | 30.1 |  | 1/19-12/19 | October 15, 2018 | Approved December 5, 2018 | January 2019
Columbia of Maryland | STRIDE - 2018 | $ | 1.2 |  | $ | 20.8 |  | 1/18-12/18 | November 1, 2017 | Approved December 20, 2017 | January 2018
Columbia of Maryland | STRIDE - 2019 | $ | 1.2 |  | $ | 19.7 |  | 1/19-12/19 | November 1, 2018 | Approved December 12, 2018 | January 2019
NIPSCO - Electric | TDSIC - 3 | $ | (2.0 | ) | $ | 75.0 |  | 5/17-11/17 | January 30, 2018 | Approved May 30, 2018 | June 2018
NIPSCO - Electric | TDSIC - 4(1) | $ | (11.8 | ) | $ | 72.2 |  | 12/17-5/18 | July 31, 2018 | Approved November 28, 2018 | December 2018
NIPSCO - Electric | TDSIC - 5(1) | $ | 15.9 |  | $ | 58.8 |  | 6/18-11/18 | January 29, 2019 | Order Expected Q2 2019 | June 2019
NIPSCO - Electric | ECRM - 31 | $ | (2.1 | ) | $ | 2.9 |  | 6/17-12/17 | January 31, 2018 | Approved April 25, 2018 | May 2018
NIPSCO - Electric | ECRM - 32 | $ | 1.0 |  | $ | — |  | 1/18-6/18 | July 31, 2018 | Approved October 11, 2018 | November 2018
NIPSCO - Electric | FMCA - 8 | $ | 1.3 |  | $ | 4.4 |  | 4/17-9/17 | November 1, 2017 | Approved January 31, 2018 | February 2018
NIPSCO - Electric | FMCA - 9 | $ | 4.1 |  | $ | 90.2 |  | 10/17-3/18 | April 27, 2018 | Approved July 25, 2018 | August 2018
NIPSCO - Electric | FMCA - 10 | $ | 2.2 |  | $ | 45.7 |  | 4/18-8/18 | October 18, 2018 | Approved January 29, 2019 | February 2019
(1)Incremental revenue is net of amounts due back to customers as a result of the TCJA. (2)Incremental revenue is net of $5.2 million of adjustments in the TDSIC-9 settlement. (3)A cap waiver was approved by the Massachusetts DPU on June 21, 2018 and related rates became effective July 2018. (4)The filing included a request for approval of a waiver to allow collection of the $2.9 million revenue requirement that exceeds the GSEP cap provision.
Rate Case Action | The following table describes current rate case actions as applicable in each of our jurisdictions net of tracker impacts:
(in millions) |  |  |  |
Company | Requested Incremental Revenue | Approved Incremental Revenue | Filed | Status | Rates Effective
NIPSCO - Gas(1) | $ | 138.1 |  | $ | 107.3 |  | September 27, 2017 | Approved September 19, 2018 | October 2018
Columbia of Massachusetts | $ | 24.1 |  | N/A |  | April 13, 2018 | Withdrawn September 19, 2018 | N/A
Columbia of Pennsylvania | $ | 46.9 |  | $ | 26.0 |  | March 16, 2018 | Approved December 6, 2018 | December 2018
Columbia of Virginia(2) | $ | 14.2 |  | In process |  | August 28, 2018 | Order expected Second half of 2019 | February 2019
Columbia of Maryland | $ | 4.6 |  | $ | 2.2 |  | April 13, 2018 | Approved November 21, 2018 | November 2018
NIPSCO - Electric | $ | 21.4 |  | In process |  | October 31, 2018 | Order expected Q3 2019 | September 2019
(1)Rates will be implemented in three steps, with implementation of step 1 rates effective October 1, 2018. Step 2 rates will be effective on or about March 1, 2019, and step 3 rates will be effective on January 1, 2020. The IURC’s order also dismissed NIPSCO from phase 2 of the IURC’s TCJA investigation. (2)Rates implemented subject to refund pending a final order from the VSCC.

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