Spatial dimension - WITCH

Model Documentation - WITCH
Model scope and methods - WITCH Model concept, solver and details - WITCH Temporal dimension - WITCH Spatial dimension - WITCH Policy - WITCH Socio-economic drivers - WITCH Population - WITCH Economic activity - WITCH Macro-economy - WITCH Technological change - WITCH Energy - WITCH Energy resource endowments - WITCH Energy conversion - WITCH Electricity - WITCH Heat - WITCH Grid, pipelines and other infrastructure - WITCH Energy end-use - WITCH Transport - WITCH Residential and commercial sectors - WITCH Industrial sector - WITCH Other end-use - WITCH Energy demand - WITCH Technological change in energy - WITCH Land-use - WITCH Agriculture - WITCH Forestry - WITCH Land-use change - WITCH Emissions - WITCH GHGs - WITCH Pollutants and non-GHG forcing agents - WITCH Carbon dioxide removal (CDR) options - WITCH Climate - WITCH Modelling of climate indicators - WITCH Climate damages, temperature changes - WITCH Non-climate sustainability dimension - WITCH Air pollution and health - WITCH Water - WITCH Appendices - WITCH Mathematical model description - WITCH Data - WITCH References - WITCH
Corresponding documentation
AIM-Hub BLUES C3IAM COFFEE-TEA DNE21+ GCAM GEM-E3 GRACE IFs IMACLIM IMAGE MESSAGE-GLOBIOM POLES PROMETHEUS REMIND-MAgPIE TIAM-UCL WITCH
Previous versions
Archive of WITCH version 4.8
Model information
Model link	https://www.witchmodel.org/ https://github.com/witch-team/witchmodel https://doc.witchmodel.org
Institution	European Institute on Economics and the Environment (RFF-CMCC EIEE), Italy, http://www.eiee.org.
Solution concept	General equilibrium (closed economy)
Solution method	Optimization
Anticipation

Countries included within the model are grouped into 17 regions clustered by geography, income and the structure of energy demand.

The regional disaggregation is now flexible and the model can be run on different model configurations, typically from 5 to 17 regions, or more.

Figure 1.1: Regions of the WITCH model

The 17 regions are:

Region	Countries
brazil	Brazil
canada	Canada
china	China, including Taiwan
europe	Europe
seasia	South East Asia
india	India
indonesia	Indonesia
jpnkor	Japan and South Korea
laca	Latin America and the Caribbean
mena	Middle East and North Africa
mexico	Mexico
oceania	Australia and New Zealand
sasia	South Asia
ssa	Sub Saharan Africa
southafrica	South Africa
te	Non-EU Eastern European countries, including Russia
usa	United States of America

WITCH features any regional aggregations in the so-called coalitions. Some common coalitions are:

• regional coalitions : each region is mapped to a coalition containing only this region.
• world coalition : a coalition containing all the world regions.

Coalitions and regions interact with each others because of the presence of economic (technology, exhaustible natural resources) and environmental global externalities.