Convert existing equipment for grid stabilisation

Rotating Grid Stabilizer Conversion (RGS)

Are you looking for ways to provide grid stabilisation services with existing equipment?
Do you want to avoid stranded assets?
Do you want to know if your power plant is eligible for synchronous condenser conversion?

With our Rotating Grid Stabilizer (RGS) conversion solution, we offer three options to repurpose your equipment to a synchronous condenser. Our expert team can consult you on the best-suited solution for your power plant based on its design and configuration.

RGS with a flywheel

What is the best RGS conversion option for your plant?

For operating units

We recommend our Hybrid Conversion for operating units. The Hybrid Conversion can be installed in an operating power plant, providing maximum flexibility via dual-mode operation that alternates between power generation mode and grid stabilization mode. As an option, additional inertia can be added by coupling a flywheel to the existing shaft line.

For retired units

Our Basic Conversion and Flywheel Conversion options are well suited for de-commissioned units. The Basic Conversion can transform an existing turbogenerator into a synchronous condenser quickly and efficiently. In addition, a tailor-made solution for startup and generator acceleration can be installed. A Flywheel Conversion can increase the system's inherent inertia. 

A tried-and-tested method for grid stabilisation

The reliability of an RGS conversion has been demonstrated through its successful implementation in projects like the Killingholme power station in the UK. Uniper repurposed two retired steam turbine generators to provide essential grid stabilising services to National Grid ESO, showcasing the effectiveness of the RGS conversion technology.

What are the benefits of the RGS conversion?

A sizeable capital investment isn’t necessary because an RGS conversion can leverage existing equipment and infrastructure, such as the balance of plant and grid connection infrastructure. As a result, an RGS conversion may be up to 50% cheaper than adding a new synchronous condenser to your power plant.

The global demand for brand-new synchronous condensers is increasing rapidly, resulting in long delivery times. This challenge can be tackled by repurposing existing equipment. Depending on the conversion scope, plant conditions, and required engineering work, a simple conversion project can be implemented within 9 months. A more complex conversion for a dual-mode operation with an additional flywheel may take approximately 20 months. 

Depending on the network system operator and regulatory frameworks, power plant operators can potentially be compensated for providing grid services. By converting your retired asset to a Rotating Grid Stabilizer, you have the option to pursue compensation and generate additional revenue.

RGS is designed to require minimal maintenance. Incurred costs can be offset by its long lifespan and additional revenue stream opportunities. Moreover, converting your gas turbine to a Hybrid Rotating Grid Stabilizer has minimal impact on your gas turbine’s generation operability. Its maintenance schedule can be aligned with the turbine service intervals. 

The Hybrid RGS Conversion allows for flexible switching between power generation and grid stabilisation modes. Its instantaneous transition from power-generating to synchronous condenser mode makes it an effective solution for quickly re-stabilising the system. 

Contact us today!


At Siemens Energy, we provide integrated solutions to convert existing equipment to a synchronous condenser, ranging from feasibility studies to installation and commissioning of the equipment. We also provide repair and maintenance services.

To speak with our expert about RGS conversion options for your power plant, please send us an email with your name, the configuration of your power station, the name of the power station, and the location.