HMI = Human-Machine Interface
SCADA = Supervisory Control and Data Acquisition
In the simplest terms, HMI is the computer console (or graphical user interface) where power plant operators monitor and control plant operations. Higher, supervisory functions are handled by SCADA software, often when multiple power plants are owned by the same company. TCSI is well versed in the many HMI and SCADA options offered by software manufacturers, and can tailor them to your needs.