Ancillary services refer to a variety of services and functions provided by actors within the electric grid that facilitate and support the continuous flow of electricity, so that the demand for electrical energy is met in real-time). These services are necessary to support the transmission of electric power from generators to consumers given the obligations of control areas and transmission utilities within those control areas to maintain reliable operations). Ancillary services are also medical services or supplies that are not provided by acute care hospitals, doctors, or healthcare professionals. Examples of ancillary services in healthcare include ambulatory surgery center services, audiology services, behavioral health services, cardiac monitoring, dialysis services, durable medical equipment, home health care services, laboratory services, radiology/diagnostic imaging, rehabilitation services, skilled nursing services, speech services, substance-abuse services, and wound-care services. Ancillary services are also services that ensure reliability and support the transmission of electricity from generation sites to customer loads, such as load regulation, spinning reserve, non-spinning reserve, replacement reserve, and voltage support.