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- Natural gas4
- Power resources3
- Natural gas pipelines2
- Biodiesel fuels1
- Coal-fired power plants1
- Economy1
- Education1
- Electric power1
- Electric power-plants1
- Electric utilities1
- Emergency management1
- Employment1
- Energy industries1
- Factory and trade waste1
- Gas wells1
- Hazardous wastes1
- Health1
- Housing1
- Interconnected electric utility systems1
- Jet planes--Fuel1