• Industries engaged in the electric power generation industry.
• Industries engaged in oil and gas exploration, refining, storage, distribution, and marketing.
• Providers of electric, water, and gas services (eg. utilities).
• Industries developing renewable and alternative energy sources.

This category also includes information resources covering these industries, such as associations, reference resources, and news.
Please note that industries providing environmental protection, safety equipment, and services such as pollution control products, waste management, recycling operations, and waste-to-energy products, are listed in the Business: Environment category tree.