If measures to reduce greenhouse gas-emissions are taken and if fission will be phased out at the beginning of the 22nd century fusion has a good chance to win considerable shares of the electricity market. A detailed model of the Western-European energy system was made using the MARKAL toolkit. Scenarios were designed to understand the conditions that would make fusion a viable electricity production technique. Globally it is very likely that at least the first half of the 21st century will still be dominated by the use of fossil fuels, with a shift away from oil to natural gas. Energy and electricity demand are likely to increase over the complete 21st century.
Hamacher, T., Lako, P., Ybema, J. R., Korhonen, R., Aquilonius, K., Cabal, H., Hallberg, B., Lechón, Y., Lepicard, S., Sáez, R., Schneider, D., & Ward, D. (2001). Can fusion help to mitigate greenhouse gas emissions? Fusion Engineering and Design, 58-59, 1087-1090. https://doi.org/10.1016/S0920-3796(01)00555-5