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A2A S.p.A. engages in the production, sale, and distribution of gas and electricity, and district heating in Italy and internationally. The company generates electricity through hydroelectric, thermoelectric, photovoltaic, cogeneration, biomass, waste treatment, and wind plants with a total installed capacity of 9.2 GW; and purchases and sells electricity, gas, fuels, and environmental certificates. It also engages in the production and sale of heat produced through district heating networks; waste management activities, including collection and street sweeping, treatment, disposal, and recovery of materials and energy; and the construction and management of integrated waste disposal plants and systems. In addition, the company offers integrated water cycle management services; and technical consultancy services relating to energy efficiency certificates. Further, it is involved in the management of public lighting systems and traffic lights, votive lamps, street lights, and water purification and sewer activities, as well as offers energy efficiency and electric mobility services. Additionally, the company provides telecommunication services; and develops infrastructures, as well as designs solutions and applications for creating new models of cities and territories. A2A S.p.A. is headquartered in Brescia, Italy.

Tutor Perini Corporation, a construction company, provides diversified general contracting, construction management, and design-build services to private customers and public agencies in the United States and internationally. It operates through three segments: Civil, Building, and Specialty Contractors. The Civil segment engages in the public works construction and the replacement and reconstruction of infrastructure; and offers contracting services, including construction and rehabilitation of highways, bridges, tunnels, mass-transit systems, military defense facilities, and water management and wastewater treatment facilities, as well as provides drilling, foundation, and excavation support for shoring, bridges, piers, roads, and highway projects. The Building segment offers range of services in various specialized building markets, such as hospitality and gaming, transportation, health care, commercial offices, government facilities, sports and entertainment, education, correctional and detention facilities, biotech, pharmaceutical, industrial, and technology. The Specialty Contractors segment provides electrical, mechanical, plumbing, and fire protection systems, as well as heating, ventilation, and air conditioning services (HVAC) for civil and building construction projects in industrial, commercial, hospitality and gaming, and mass-transit end markets. It also offers pre-construction planning and project management services comprising planning and scheduling of the manpower, equipment, materials, and subcontractor services; and self-performed construction services consisting of site work, concrete forming and placement, and steel erection. The company was formerly known as Perini Corporation and changed its name to Tutor Perini Corporation in May 2009. Tutor Perini Corporation was founded in 1894 and is headquartered in Sylmar, California.