Energy Models, Software, Tools and Databases


A modeling framework for medium- to long-term energy system planning, energy policy analysis, and scenario development More

Interactive Tools

To make the insights from MESSAGE easier to understand, the Energy Program has developed interactive tools that visualise the large volume of raw data from the model.

The NExus Solutions Tool (NEST)

IIASA will work with the Ministry of Environment, Forest and Climate Change in India (MoEFCC) by helping to develop tools that will assist policy makers. This tool will aim to lead the Indian Government agencies in evaluating targets for Land Degradation Neutrality (LDN) and Sustainable Development Goals (SDGs). More

Energy Access Interactive Tool

An interactive Web-based scenario analysis tool which allows the assessment of multiple energy access policies More

Energy Multi-Criteria Analysis Tool

An interactive Web-based scenario analysis tool which allows the concurrent assessment of multiple energy objectives More


Scientific Software

The Energy Program is developing a suite of tools and scientific software packages to facilitate the analysis of climate-change mitigation scenarios in the context of sustainable development. More


Scenario Databases

Other results from the MESSAGE model, as well complementary results from energy models from our research partners outside IIASA and suplementary results from other IIASA models like GAINS and GLOBIOM, can be found in our scenario databases.

IAMC 1.5°C Scenario Explorer hosted by IIASA

This Scenario Explorer presents an ensemble of quantitative, model-based climate change mitigation pathways underpinning the Special Report on Global Warming of 1.5°C (SR15) by the Intergovernmental Panel on Climate Change (IPCC) published in 2018. The ensemble was also used and extended in the IPCC's Special Report on Climate Change and Land (SRCCL, 2019). Scenario Explorer More

CD-LINKS Scenario Database

 The CD-LINKS consortium has developed a set of consistent national and global low-carbon development pathways that take current national policies and the Nationally Determined Contributions (NDCs) as an entry point for short-term climate action and then transition to long-term goals of 1.5 and 2°C as defined by the Paris Agreement.  More

Low Energy Demand study: LED

An exploratory research and resulting scenario about how far transformative changes on the energy end-use side can lead to. More

IPCC AR5 Scenarios Database

The IPCC AR5 Scenarios Database documents the long-term scenarios as reviewed in the Fifth Assessment Report (AR5) of Working Group III of the Intergovernmental Panel on Climate Change (IPCC). More

SSP Scenario Database

The Shared Socioeconomic Pathways (SSPs) will be used alongside the Representative Concentration Pathways (RCPs) to analyze the feedbacks between climate change and socioeconomic factors, such as world population growth, economic development and technological progress.  IIASA began work in 2011 on quantifying one of the five SSPs. The Energy Program has spearheaded the cross-program collaboration with the Population and Ecosystem Services Management programs. More

Representative Concentration Pathways Database

A database with scenarios from the integrated assessment community to expedite climate change assessments More

Global Energy Assessment Scenario Database

The Global Energy Assessment (GEA) Scenario database documents results and assumptions of the GEA energy transformation pathways that underpin the GEA. The database serves as a central data repository for the dissemination of GEA scenario information. More

LIMITS Scenario Database

The LIMITS Scenario database, operated by IIASA for the LIMITS consortium, hosts the results of the LIMITS modeling comparison exercise. The LIMITS project aims at advancing the understanding of the implementation of climate policies consistent with 2 degree Celsius. The main objective of the project is to provide an assessment of the emissions reductions strategies at the level of the world and the major global economies. More

AMPERE Scenario database

The AMPERE database, operated by IIASA for the AMPERE consortium, hosts the model results for work packages 2, 3, and 5, as well as the results from the model diagnostics project. AMPERE scenario data were used in a series of research papers, which were published in a special issue of Technological Forecasting and Social Change as well as other journals. In addition, the results were used in the 5th Assessment Report of Working Group III of the IPCC. More

Greenhouse Gas Initiative Scenario Database

A database of greenhouse gas emission mitigation scenarios More

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Last edited: 20 May 2020


Volker Krey

Deputy Program Director


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Keywan Riahi

Program Director


T +43(0) 2236 807 491

Daniel Huppmann

Research Scholar


T +43(0) 2236 807 572

Peter Kolp


Transitions To New Technologies


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