Socio-MARKAL is a framework elaborated to include behavioural parameters into energy optimization models based on the concept of economic equilibrium. This article deals with first insights on issues when passing from MARKAL model to TIMES model and from the scope of a city (Nyon) or region (Geneva) to a country model of Romania, drawing directions for future modelling efforts on the demand side including energy consumer behaviour: the case of lighting bulbs that already has been explored as a pilot study in Switzerland, and the case of residential space heating which will be first implemented in TIMES-Romania model, paving the way to a generalized Socio-TIMES approach.