# Relationship history for MSHA mine 3606475

Current hierarchy: **NRG Energy Inc → NRG Homer City Services LLC → Homer City Coal Cleaning Plant**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Iselin Preparation Company → Homer City Coal Cleaning Plant; 1977-06-01 to 1990-08-07; source msha-controller-operator-history
- **controller_controls_mine:** Rochester & Pittsburgh Coal Company → Homer City Coal Cleaning Plant; 1977-06-01 to 1990-08-07; source msha-controller-operator-history
- **controller_controls_operator:** Rochester & Pittsburgh Coal Company → Iselin Preparation Company; 1977-06-01 to 1990-08-07; source msha-controller-operator-history
- **operator_operates_mine:** Homer City Coal Processing Corporation → Homer City Coal Cleaning Plant; 1990-08-08 to 2016-03-30; source msha-controller-operator-history
- **controller_controls_mine:** CLI International Enterprises Corp → Homer City Coal Cleaning Plant; 1990-08-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CLI International Enterprises Corp → Homer City Coal Processing Corporation; 1990-08-08 to 2016-03-30; source msha-controller-operator-history
- **controller_controls_mine:** NRG Energy Inc → Homer City Coal Cleaning Plant; 2012-12-14 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** NRG Homer City Services LLC → Homer City Coal Cleaning Plant; 2016-03-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** NRG Energy Inc → NRG Homer City Services LLC; 2016-03-31 to current/open; source msha-controller-operator-history