Reference card - IPETS

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The reference card is a clearly defined description of model features. The numerous options have been organized into a limited amount of default and model specific (non default) options. In addition some features are described by a short clarifying text.


  • not implemented
  • implemented
  • implemented (not default option)


Name and version


Institution and users

National Center for Atmospheric Research (NCAR), USA,


IPETS documentation is limited and consists of a reference card

Model scope and methods


The iPETS model is developed to analyze greenhouse gas mitigation and climate change impacts with a special emphasis on the implications of demographic heterogeneity.


Computable General Equilibrium

Solution method

The economic problem is formulated as a three-level nested problem. The solution of these three sub-problems yield the dynamic capital path (investment/consumption trade-off in each simulation year), and factor and output prices which clear all factor and goods markets.


Forward looking

Temporal dimension

Base year:2004, time steps:annual, horizon: 2100

Spatial dimension

Number of regions:9

  1. China
  2. EU27+
  3. India
  4. Latin America
  5. Other Developing Countries
  6. Other Industrialized Countries
  7. sub-Saharan Africa
  8. Transition Countries
  9. USA

Policy implementation

Climate policy through (global or regional) carbon tax or emission target (annual level or temporal budget)

Socio economic drivers

Exogenous drivers

  • Exogenous GDP
  • Total Factor Productivity
  • Labour Productivity
  • Capital Technical progress
  • Energy Technical progress
  • Materials Technical progress
  • GDP per capita

Note: Exogenous GDP paths are targeted for baseline scenarios by modifying labor productivity. In mitigation and impacts analyses GDP is endogenously determined.


  • GDP per capita
  • Income distribution in a region
  • Urbanisation rate
  • Education level
  • Labour participation rate

Macro economy

Economic sectors

  • Agriculture
  • Industry
  • Energy
  • Transport
  • Services

Cost measures

  • GDP loss
  • Welfare loss
  • Consumption loss
  • Area under MAC
  • Energy system costs


  • Coal
  • Oil
  • Gas
  • Uranium
  • Electricity
  • Bioenergy crops
  • Food crops
  • Capital
  • Emissions permits
  • Non-energy goods


Resource use

  • Coal
  • Oil
  • Gas
  • Uranium
  • Biomass

Electricity technologies

  • Coal
  • Gas
  • Oil
  • Nuclear
  • Biomass
  • Wind
  • Solar PV
  • CCS
  • non-fossil

Note: generic CES function for each electricity producing sector

Conversion technologies

  • CHP
  • Heat pumps
  • Hydrogen
  • Fuel to gas
  • Fuel to liquid
  • Refined fuels

Note: Refined fuels can be produced from any feedstock (but initially mostly represent crude oil to fuels)

Grid and infrastructure

  • Electricity
  • Gas
  • Heat
  • CO2
  • H2

Energy technology substitution

  • Discrete technology choices
  • Expansion and decline constraints
  • System integration constraints

Energy service sectors

  • Transportation
  • Industry
  • Residential and commercial



  • Cropland
  • Forest
  • pasture

Other resources

Other resources

  • Water
  • Metals
  • Cement

Emissions and climate

Green house gasses

  • CO2
  • CH4
  • N2O
  • HFCs
  • CFCs
  • SF6


  • NOx
  • SOx
  • BC
  • OC
  • Ozone

Climate indicators

  • CO2e concentration (ppm)
  • Climate damages $ or equivalent
  • Radiative Forcing (W/m2 )
  • Temperature change (°C)