The WACC of MPLX LP (MPLX) is 7.3%.
| Range | Selected | |
| Cost of equity | 7.00% - 9.90% | 8.45% |
| Tax rate | 0.10% - 0.20% | 0.15% |
| Cost of debt | 4.10% - 5.10% | 4.60% |
| WACC | 6.1% - 8.5% | 7.3% |
| Category | Low | High |
| Long-term bond rate | 3.9% | 4.4% |
| Equity market risk premium | 4.6% | 5.6% |
| Adjusted beta | 0.68 | 0.9 |
| Additional risk adjustments | 0.0% | 0.5% |
| Cost of equity | 7.00% | 9.90% |
| Tax rate | 0.10% | 0.20% |
| Debt/Equity ratio | 0.43 | 0.43 |
| Cost of debt | 4.10% | 5.10% |
| After-tax WACC | 6.1% | 8.5% |
| Selected WACC | 7.3% | |