EnergyPATHWAYS allows you to create a robust energy model for your geography, and to determine the costs and benefits of different scenarios for transitioning to a low-carbon energy system.


The EnergyPATHWAYS model is a professional, open-source energy and emission planning tool for use in evaluating long-term, economy-wide greenhouse gas mitigation scenarios. It is available both as a server application, designed for use by researchers and developers, and as a web-based online tool, freely available for use by energy analysts working at national, regional, state, and local levels throughout the world.

Contact us for more information on how to download the server software or gain access to the web-based application.


EnergyPATHWAYS was built to investigate alternative decarbonization scenarios by calculating emissions, energy flows, costs, and other important factors. It allows the user to create robust scenarios that explore the costs and benefits of different energy transition strategies at any geographic level or jurisdiction, including the city, state, region, national and multi-national levels.

Key features include hourly electricity system optimization – making the tool well suited for exploring high penetrations of renewable energy on the grid and end-use electrification – and infrastructure stock flow models that accurately reflect infrastructure inertia during energy system transitions.


EnergyPATHWAYS analysis has been used to support the creation of effective decarbonization policies and regulations for half a decade, was the basis for the national Deep Decarbonization Pathways Project reports for the United States, and was instrumental in developing the United States Mid-Century Strategy for Deep Decarbonization pursuant to the 2015 Paris Agreement. Today, the tools supports decarbonization initiatives by the states of California, Washington and New York, as well as initiatives and investigations by national laboratories, public utilities, NGOs, and private corporations.

We believe that EnergyPATHWAYS has the potential to play a key role in current and future initiatives across the U.S. and the globe that will help meet the goals of reducing emissions 80% by 2050 and limiting climate change to 2ºC.


The EnergyPATHWAYS code for both the web and server applications is open-source and it can be found on GitHub, along with more detailed model documentation. Further, all USDDPP databases, methods and assumptions are open to independent verification. We are in the process of creating the infrastructure to make EnergyPATHWAYS a community based open-source project, including support for user contributed extensions to the core application, geographic-specific features and additional data sets.

In the near future, we will be calling on all academics, NGOs, business and advocacy organizations who build energy system and emissions models to adhere to a series a fundamental standards for openness, thereby enabling a new level of transparency and openness in the data used by the regulators and agencies responsible for setting energy policy.


We understand that the creation of decarbonization pathway analysis at the regional, national and multi-national level around the world will be critical to inform near-term climate policy, which is why we have expanded EnergyPATHWAYS for international use, helping to facilitate long term energy planning worldwide. We are available to support developers outside the U.S. who want to customize the EnergyPATHWAYS platform for their specific requirements.