Robust simulation capabilities across electric, water and gas systems focusing on full user control, transparency and accuracy across numerous constraints and uncertainties.

PLEXOS® Energy Simulation Software

Hundreds of organizations rely on PLEXOS to deliver mission-critical insights for $million-billion decisions. Now celebrating 20 years in the market, PLEXOS continues to be proven by the world’s leading system operators, regulators and planners as well as utilities, traders, consultants and manufacturers. This energy simulation software is the de facto standard of ISOs and TSOs around the world.

Optimization Innovation

PLEXOS has a range of features that seamlessly integrates electric, water and gas systems and is the preferred choice for co-optimization modelling. It uses an innovative approach to problem-solve these sophisticated levels of constraints and uncertainties.

The traditional approach to simulation involves developing a solution to a defined problem. However within the electric industry, there are many unique, overlapping “problems” including long-term capacity planning, system reliability, portfolio optimization and more. The traditional approach is to write a software solution for each problem, which leads to inconsistencies between solutions, duplicated code, slow computing time and increased costs.

Rather than providing a solution to a problem, PLEXOS itself is a problem-solving engine. Across all problems, there are common themes and requirements. PLEXOS expresses these in an ‘extensible object model’ (a consistent set of building blocks with features that can easily be extended as needed in the future). The intelligence of the simulation engine then reads the user’s data and settings to develop a solution method for the exact problem the user defined.

Traditional approach key limitations compared to the key advantages of the PLEXOS approach to energy simulation software
PLEXOS optimized energy simulation software compared to a traditional modeling approach.


Optimization-based simulation tools, like PLEXOS, benefit from the multiplicative combination of CPU and algorithm improvement, which has improved by approximately 500-fold since 1999. This performance improvement resulted in a natural expansion (both vertically and horizontally) of the market as the number of customers for simulation grew due to more sophisticated solving capabilities. Because of its scalable design, PLEXOS is substantially better placed to capitalize on market expansion due to the multiplicative combination of CPU and algorithm improvement.

Use Cases

Customers of PLEXOS use the energy simulation software across many use cases:

  • Generation planning and budgeting
    • IRP
    • Budget projections
    • Environmental policies
  • Market analysis
    • Price forecasting
    • Scenario evaluation
    • Risk assessment
    • Market design and policy analysis
  • Transmission planning
    • Frequency and cost of congestion
    • Product cost impacts on transmission
    • Infrastructure studies
    • Endogenous transmission expansion
  • Trading support
    • Short-term
    • FTR
    • Contract or portfolio analysis
  • Operational simulation
    • Local reliability constraints
    • CCGT
    • AGC
  • Renewable integrations
  • Reliability planning
    • Regional capacity availability
    • Multi-regional LOLP
    • Nodal LOLP
  • Electricity and gas co-optimization
  • Electricity and water co-optimization
  • Hydro and storage optimization
View of computer screen with advanced report visualizations of energy simulation software
PLEXOS advanced visualization