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OSeMOSYS - Open Source Energy Modelling System

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Welcome to OSeMOSYS - the Open Source energy MOdelling SYStem. This source code repository contains the Apache-2.0 licensed source-code for three different flavours of OSeMOSYS - GNU MathProg, Python and GAMS. The different versions are contained in subfolders, together with readme files which provide information of how to install and run the code.


OSeMOSYS is a full-fledged systems optimization model generator for long-term energy planning. Unlike long established energy systems models, such as MARKAL/TIMES (ETSAP, 2010), MESSAGE (IAEA, 2010), PRIMES (NTUA, 2010), EFOM (Van der Voort, 1982) and POLES (Enerdata, 2010), OSeMOSYS potentially requires a less significant learning curve and time commitment to build and operate. Additionally, by not using proprietary software or commercial programming languages and solvers, OSeMOSYS requires no upfront financial investment. These two advantages extend the availability of energy modeling to large communities of students, business analysts, government specialists and developing countries energy researchers.


OSeMOSYS is designed to fill a gap in the analytical toolbox available to the energy research community and energy planners in developing countries. At present there exists a useful, but limited set of accessible energy system models. These tools often require significant investment in terms of human resources, training and software purchases in order to apply or further develop them. In addition, their structure is often such that integration with other tools, when possible, can be difficult.

Energy Specialists

The OSeMOSYS code is relatively straightforward and transparent and allows for simple refinements and the ability to conduct sophisticated analyses. As models are made to generate insights, OSeMOSYS allows a test-bed for new energy model developments.


Enabling graduate students to build and iteratively develop formal energy models will impart this knowledge base to very wide range of energy market roles and positions. Extending the human capacity of private and public policy makers to use and understand energy models is a key step in the effective use and interpretation of formal analytical tools. And growing human capacity in energy modeling in developing countries – whose institutions have relatively fewer research resources – is particularly important, given the growth of developing countries in energy related emissions, resource use, and demand for energy services.


OSeMOSYS community welcomes professionals and experts from different levels: decision makers, policy officers, energy planners, developers of new model functionalities, programmers.

The OpTIMUS Community, Practice 3

OSeMOSYS is part of the OpTIMUS Community, Practice 3: Open Software, together with other world class, peer reviewed open source tools and data.

OpTIMUS aims at promoting quantitative analysis to inform sustainable development policy, through the coordination of networks to advance open source software, knowledge development and capacity building. It is organized in three practices -modeling and capacity building for policy support, expert review and quality control, and software development. For more information on the OpTIMUS Community, please visit the related website:

Getting the OSeMOSYS code


The OSeMOSYS code packages you need for writing your own models are released on the website, along with a lot of useful information on how to get started.


OSeMOSYS consists of this repository and several submodules, which contain the different language implementations of the OSeMOSYS formulation.

To obtain all the OSeMOSYS code including the language implementations for development purposes, run the following commands from your command line:

cd <name_of_folder>
git clone # obtain the OSeMOSYS repository code
git submodule init # initialize your local submodule configuration file
git submodule update # fetch all the data from project and check out correct commit

If successful, this should download all the code to the folder you specified in the first step.

Alternatively, use the --recurse-submodules argument to the git clone command:

cd <name_of_folder>
git clone --recurse-submodules
# obtain the OSeMOSYS repository code and submodules all in one line


OSeMOSYS - the Open Source Energy Modelling System




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