| In millions, except per share items | Jun-30-23 | Mar-31-23 | Dec-31-22 | Sep-30-22 | Jun-30-22 | Mar-31-22 | Dec-31-21 | Sep-30-21 |
| | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K | 10-Q |
| Revenues: |
| Electric Operations | 71.1 | 92.5 | | | | | | |
| Corporate and Other | | 0.6 | | | 0.6 | 0.6 | | |
| Coal Operations | 113.1 | 95.3 | | | 65.3 | 58.3 | | |
| Total revenues [+] | 161.2 | 188.3 | 152.1 | 85.1 | 65.9 | 58.9 | 65.5 | 79.8 |
| Net interest income | 2.5 | 2.7 | 2.4 | 2.4 | 1.8 | 1.7 | 1.9 | 2.2 |
| Other income | 1.6 | 1.3 | 1.2 | 1.5 | 1.8 | 1.9 | 1.1 | 0.8 |
| Revenue growth [+] | 144.5% | 219.7% | 132.1% | 6.6% | 18.5% | 26.2% | -0.2% | 22.3% |
| Corporate and Other | | -0.5% | | | | | | |
| Coal Operations | 73.1% | 63.3% | | | | | | |
| Cost of goods sold | 115.4 | 133.5 | 96.1 | 64.6 | 51.4 | 54.6 | 54.6 | 67.8 |
| Gross profit | 45.8 | 54.8 | 56.0 | 20.5 | 14.5 | 4.3 | 10.9 | 12.0 |
| Gross margin | 28.4% | 29.1% | 36.8% | 24.1% | 22.0% | 7.3% | 16.7% | 15.1% |
| Selling, general and administrative [+] | 5.6 | 6.9 | 10.9 | 3.6 | 3.7 | 3.1 | 8.5 | 3.1 |
| General and administrative | | | 15.8 | | | | 11.4 | |
| Other selling, general and administrative | | | -4.9 | | | | -2.9 | |
| Equity in earnings | -0.2 | 0.1 | -0.1 | 0.2 | 0.2 | 0.2 | 0.2 | 0.1 |
| Other operating expenses [+] | 0.8 | 0.7 | -4.4 | 0.4 | 0.5 | 0.3 | -5.9 | 0.5 |
| Exploration expenses | 0.3 | 0.2 | 0.3 | 0.1 | 0.2 | 0.1 | 0.2 | 0.1 |
| EBITDA [+] | 39.2 | 47.3 | 49.5 | 16.8 | 10.5 | 1.0 | 8.5 | 8.6 |
| EBITDA growth | 272.0% | 4609.0% | 479.8% | 95.3% | 12.9% | -89.4% | 13.8% | -42.5% |
| EBITDA margin | 24.3% | 25.1% | 32.5% | 19.7% | 16.0% | 1.7% | 13.0% | 10.7% |
| Depreciation and amortization | 17.2 | 18.0 | 15.0 | 11.2 | 11.2 | 9.5 | 10.1 | 9.8 |
| EBIT [+] | 22.0 | 29.3 | 34.5 | 5.6 | -0.6 | -8.5 | -1.6 | -1.3 |
| EBIT growth | -3607.5% | -443.6% | -2282.7% | -539.8% | 63.1% | 888.1% | -20.5% | -122.6% |
| EBIT margin | 13.7% | 15.6% | 22.7% | 6.5% | -1.0% | -14.5% | -2.4% | -1.6% |
| Non-recurring items | | | | | | | 1.6 | |
| Interest expense | 3.5 | 3.9 | 3.5 | 3.4 | 2.3 | 1.8 | 1.9 | 2.1 |
| Interest expense | 3.5 | 3.9 | 3.5 | 3.4 | 2.3 | 1.8 | 1.9 | 2.1 |
| Other income (expense), net [+] | | | | | | | | 10.0 |
| Amortization of financing costs and debt discount | 1.0 | 1.2 | 1.1 | 1.0 | 0.8 | 0.7 | 0.7 | 0.7 |
| Gain (loss) on debt retirement | | | | | | | | 10.0 |
| Write-off of deferred debt issuance costs | | | | | | | | 10.0 |
| Pre-tax income | 18.5 | 25.4 | 30.9 | 2.2 | -3.0 | -10.3 | -5.0 | 6.6 |
| Income taxes | 1.6 | 3.4 | 0.9 | 0.6 | 0.4 | -0.2 | 2.7 | -1.4 |
| Tax rate | 8.5% | 13.2% | 3.0% | 27.0% | | 1.7% | | |
| Net income | 16.9 | 22.1 | 30.0 | 1.6 | -3.4 | -10.1 | -7.7 | 8.0 |
| Net margin | 10.5% | 11.7% | 19.7% | 1.9% | -5.1% | -17.2% | -11.8% | 10.0% |
| |
| Basic EPS [+] | $0.51 | $0.67 | $0.94 | $0.05 | ($0.11) | ($0.33) | ($0.25) | $0.26 |
| Growth | -564.5% | -303.1% | -470.3% | -81.3% | 13.5% | 876.4% | 62.6% | 313.3% |
| Diluted EPS [+] | $0.46 | $0.60 | $0.89 | $0.05 | ($0.11) | ($0.33) | ($0.25) | $0.26 |
| Growth | -519.3% | -282.3% | -452.6% | -81.4% | 13.5% | 876.4% | 62.6% | 313.3% |
| |
| |
| Shares outstanding (basic) [+] | 33.1 | 33.0 | 32.0 | 33.0 | 30.8 | 30.8 | 30.6 | 30.6 |
| Growth | 7.6% | 7.1% | 4.7% | 7.7% | 0.6% | 0.6% | 0.6% | 0.5% |
| Shares outstanding (diluted) [+] | 36.7 | 36.7 | 33.6 | 33.3 | 30.8 | 30.8 | 30.6 | 30.6 |
| Growth | 19.1% | 19.3% | 9.9% | 8.7% | 0.6% | 0.6% | 0.6% | 0.5% |
| |
| EBIT is a non-GAAP figure that excludes all non-recurring expenses: restructuring costs, asset impairments, IPR&D writeoffs, and other unusual charges. |