# Relationship history for MSHA mine 3608222

Current hierarchy: **NRG Energy Inc → NRG Homer City Services LLC → Homer City Generating Station**

- 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:** Gpu Generation Inc → Homer City Generating Station; 1991-01-01 to 1999-03-17; source msha-controller-operator-history
- **controller_controls_mine:** GPU Inc → Homer City Generating Station; 1991-01-01 to 1999-03-17; source msha-controller-operator-history
- **controller_controls_operator:** GPU Inc → Gpu Generation Inc; 1991-01-01 to 1999-03-17; source msha-controller-operator-history
- **operator_operates_mine:** EME Homer City Generation L P → Homer City Generating Station; 1999-03-18 to 2012-12-13; source msha-controller-operator-history
- **controller_controls_mine:** Edison International → Homer City Generating Station; 1999-03-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Edison International → EME Homer City Generation L P; 1999-03-18 to 2012-12-13; source msha-controller-operator-history
- **operator_operates_mine:** NRG Homer City Services LLC → Homer City Generating Station; 2012-12-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** NRG Energy Inc → Homer City Generating Station; 2012-12-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** NRG Energy Inc → NRG Homer City Services LLC; 2012-12-14 to current/open; source msha-controller-operator-history