Chevron Corporation, formerly known as the Pacific Coast Oil Company, is one of the largest integrated energy companies in the United States and among the largest corporations in the world. Founded in 1879, it engages in various aspects of the oil and natural gas industry, including exploration and production, marketing and transportation, chemicals manufacturing and sales, geothermal and power generation. Chevron Corporation has a global work force of more than 65,000 employees. It invests in the development of various emerging energy technologies, such as creating hydrogen fuel systems and expanding renewable energy resources. The company provides a variety of additives, chemicals, lubricants and specialty products under its Chevron brand. It also offers products from Texaco and Caltex. Additionally, Chevron Corporation provides coal mining, power generation, cash management and debt financing, insurance and real estate services. Headquartered in San Ramon, Calif., it conducts business in over 100 countries.