This includes power boilers, turbines, generators, transformers, breakers, motors, battery systems, uninterruptible power supplies, variable speed drives, distributive process control systems, programmable logic controllers, relay logic, motor-operated valves, damper drives, lighting, heat tracing, telephones, intercoms and various field devices. As a leading combination electricity and natural gas energy company, Xcel Energy offers a comprehensive portfolio of energy-related products and services to 3.4 million electricity and 1.9 million natural gas customers across eight Western and Midwestern states.