Smart Wires Inc.



The transition to dynamic ratings

SUMO is a state-of-the-art dynamic line rating software, developed by one of Europe’s leading TSOs, that provides network-wide thermal ratings to identify spare grid capacity above static limits. Since no hardware is required SUMO can be deployed faster and at a lower cost compared to traditional DLR. Powerful synergies exist when SUMO is combined with SmartValve, which redirects power flows to use the available capacity identified by SUMO.The SUMO Ambient Adjusted Rating (AAR) option is compliant with FERC Order 881 for US utilities. 

SUMO transmission lines

The SUMO difference

  • Built by a system operator, for system operators
  • Contactless DLR software ensures rapid and low-cost implementation
  • Wide-scale visibility of conductors, transformers and other network components
  • Range of subscription options based on each system operator’s unique needs
  • Real-time and forecasted ratings for N-0 and N-1 topologies
  • Easily scalable across additional lines and equipment 
  • AAR option is FERC Order 881 compliant
  • Easy integration with SCADA/EMS
  • Multiplier effect when combined with SmartValve which  redirects power flows to utilize capacity identified by SUMO
  • Optional hardware sensors for conductor temperature to enhance data granularity
Download SUMO Brochure
Download ELES Case Study

Getting more from your grid

Improve resiliency, safety and reliability

Use system-wide visibility to maintain system reliability and reduce impact of adverse weather conditions. In Slovenia, SUMO mitigates over 50 network events in N, and 500 in N-1 topology on average per year.

Support connection of more renewables

Identify opportunities to unlock capacity on the existing network based on real-time and forecasted weather conditions. SUMO identifies higher transmission capacity 92-96% of time, with median increase of 15-20 % of the nominal.

Unlock grid capacity by combining with SmartValve

Reduce the need for infrastructure by combining SUMO with digital power flow control to use spare capacity on the existing grid, minimizing disruption to local communities and the environment.

Optimize asset lifetimes

Monitor asset health and ensure system components stay within safe operating limits to optimize infrastructure lifetime. Option to use hardware sensors to increase data granularity.

Prevent icing events

Automatically identify when there is high risk of icing through system alarms so that measures can be taken to prevent icing of transmission lines or network components.

Tailored subscription options for your unique needs

Ambient Adjusted Rating (AAR)

  • Best suited for system operators in the US for compliance with FERC Order 881, or system operators who need a simple rating system based on ambient temperature
  • Enables implementation of seasonal ratings and  emergency ratings
  • Easy integration with SCADA/EMS

Dynamic Line Rating (DLR)

  • Full Dynamic Line Rating system that builds on the AAR option to provide real-time and forecasted ratings for conductors, transformers and other network components in N-0 and N-1 topologies
  • Offers inverse DLR algorithm for icing prevention
  • Interface via APIs for third-party extensions
  • Includes optional hardware sensors for conductor temperature to enhance data granularity

Built by a system operator, for system operators

Leading transmission network owner and operator, ELES, saw the potential to get more from their existing grid by using real-time ratings of network elements. SUMO was born.

This state-of-the-art software is now deployed across the transmission grid in Slovenia, and used on a daily basis for real-time operation and operational planning both nationally and internationally in Europe. Over the past 10 years, ELES have used their operational experience with SUMO to refine the software and expand its use across the network.

Download ELES Case Study


Transmission lines (110 kV, 220 kV and 400 kV lines)


Years of use in daily operation and operational planning


Number of annual events mitigated in N-1 topology on average

After seeing the huge impact SUMO can have on improving operational security and support increasing grid capacity, ELES decided to share SUMO with the world. SUMO is already used by several system operators in Europe.

We launched SUMO in 2022 to complement our suite of grid enhancing technologies, combining the power of modelling, analytics, dynamic ratings, and digital power flow control to help grid operators across the global meet the demands of renewable energy adoption and demand-side electrification.

Combining SUMO with other GETs

Powerful synergies exist when SUMO is combined with other grid enhancing technologies (GETs), particularly our advanced power flow control technology SmartValve™. This is because SUMO identifies spare capacity above static line limits, and SmartValve redirects power flows to utilize this available capacity and provide other dynamic services. This creates a multiplier effect which enables much more renewable energy to flow on the existing grid infrastructure, improves resiliency, and solves many other critical grid challenges.  

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