Dynamic resistors convert excess renewable energy into a fast-response spinning reserve, meaning they can stabilise system frequency and maintain thermal generation at a more efficient constant load. Hydro Tasmania have developed modular dynamic resistors ranging from 250 kW to 3 MW blocks.  

The role of the dynamic resistor is as a regulator of system frequency under high renewable energy conditions. It reduces the demands on the diesel generators, allowing them to generate at an efficient stable load. Its rapid response absorbs excess renewable generation, eliminating frequency excursions under these high renewable penetration conditions.