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 14 regions clustered on the basis of geography, income and the structure of energy demand. Regional disaggregation can be easily performed subject to the issue being tackled.

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Figure 1.1: Regions of the WITCH model (except that India and Indonesia are not detached from their former regions, sasia and easia, respectively).

The 13 regions are:

Region	Countries
cajaz	Canada, Japan, New Zealand
china	China, including Taiwan
easia	South East Asia
india	India
indo	Indonesia
kosau	South Korea, South Africa, Australia
laca	Latin America, Mexico and Caribbean
mena	Middle East and North Africa
neweuro	EU new countries + Switzerland + Norway
oldeuro	EU old countries (EU-15)
sasia	South Asia
ssa	Sub Saharan 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.