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Description of IMACLIM models

The computation of long term economic pathways and the assessment of sustainable development policies require models able to embark information and expectations from economists, engineers, earth scientists and stakeholders. CIRED has drawn the architecture of modelling IMACLIM in order to cope with this scientific challenge at the interface of environment and development issues, in particular to assess climatic and energy policies. It relies on a hybrid model which combines a macroeconomic approach with sectional-engineers views. The model is currently available in a a country version, IMACLIM-Country (Ghersi and Hourcade, 2006), and a recursive version Imaclim-R (Crassous and al, 2006).

IMACLIM-Country projects the economy of a country or a region to a given time horizon (for instance 2030), while taking into account constraints linked, on the one hand, to macroeconomics and on the other hand to technical systems. It is particularly used to assess the macroeconomic impacts of climate policies (carbon taxes, quotas) according to the specifics of implementation (recycling of pricing proceeds, public budget balance assumptions, etc.). Current studies focus on France, Brazil and South Africa, while developments are in progress for Saudi Arabia, India, China and Argentina.

IMACLIM-R projects the economy as series of annual static equilibrium whose evolution is guided by demographic trends. 12 detailed sectional modules (electricity, transport, fossil fuels, residential) applied in 12 regions are connected to the input-output model of the static version. Imaclim-R is used to make long term evolution of energetic systems scenarios and assess GHG reduction emissions.