  The interdependence of electricity and natural gas markets is becoming a
major topic in energy research. Integrated energy models are used to assist
decision-making for businesses and policymakers addressing challenges of energy
transition and climate change. The analysis of complex energy systems requires
large-scale models, which are based on extensive databases, intertemporal
dynamics and a multitude of decision variables. Integrating such energy system
models results in increased system complexity. This complexity poses a
challenge for energy modellers to address multiple uncertainties that affect
both markets. Stochastic optimisation approaches enable an adequate
consideration of uncertainties in investment and operation planning; however,
stochastic modelling of integrated large-scale energy systems further scales
the level of complexity. In this paper, we combine integrated and stochastic
optimisation problems and parametrise our model for European electricity and
gas markets. We analyse and compare the impact of uncertain input parameters,
such as gas and electricity demand, renewable energy capacities and fuel and
CO2 prices, on the quality of the solution obtained in the integrated
optimisation problem. Our results quantify the value of encoding uncertainty as
a part of a model. While the methodological contribution should be of interest
for energy modellers, our findings are relevant for industry experts and
stakeholders with an empirical interest in the European energy system.
