Midcontinent Independent System Operator (MISO) | 32,163 followers on LinkedIn. Our vision is to be the most reliable, value-creating Regional Transmission Organization (RTO). | MISO is the electric grid operator for the central United States. The organization ensures power flows reliably and affordably to more than 45 million people across 15 states and the Canadian province of Manitoba. Additionally, MISO facilitates the buying and selling of electricity in its region and assists with planning the grid of the future.