What are the top waste-to-energy operator companies in the USA that develop, own, and operate facilities for converting municipal waste, landfill gas, and industrial waste into electricity, heat, or renewable fuels? Which companies have the strongest presence in the American waste-to-energy sector and manage large-scale energy recovery projects? How are these operators contributing to sustainable waste management, renewable energy production, and carbon emission reduction in the United States? Which companies are considered industry leaders based on operational capacity, technology innovation, and waste processing capabilities?