A way of consumption without degradation of the Earth’s resources is austere consumption. An austere consumer’s lifestyle is characterized by moderation in the acquisition and use of economic goods and services in such an inventive way that long-term goals are achieved. It is necessary to understand the patterns that characterize consumers, both those with an austere lifestyle and those with a life of luxury and squander. The average consumption of Electric Power (EP) in Mexico City per household is 270 kWh bimonthly equivalent to USD$41 approximately (Mexico City Government, 2007). From a social-ecological perspective, and within the Mexican context, EP consumption represents a problem which has been scarcely studied and which requires a multi-disciplinary approach to obtain viable and efficient options. The household EP consumption pattern in Mexico City depends mainly on the house’s appliances, the weather, the family’s habits and the time of day. Thus, 35% of household EP consumption is used on illumination; 30% on refrigeration; 25% on entertainment and 10% on other activities (Ramos, 2003). Empirical evidence suggests that austere consumption is an important variable in a pro-environmental behavior regarding water consumption, reduction of consumption and purchase of products (Iwata, 2006). So far, empirical evidence has not been identified relating from austere consumption and household EP consumption. The objective was to document austere household EP consumption and how it relates to low and medium socio-economic levels. The scale generated, “Rational Electric Power Consumption – CREE” (by its acronym in Spanish) is based on the social satisfaction curve proposed by Domínguez and Robin (1992). The curve explains the relationship between money expenditure and consumer satisfaction for any good or service received, classifying consumers according to their lifestyle. This curve covers four aspects: survival, comfort, luxury and squander. The scale has five factors (luxury, squander, consumption due to ignorance, efficient consumption and pollution) with alpha >.67. The sample was 200 housewives living in two apartment complexes in Mexico City, from medium and low socio-economic classes. The scope and limitations of austere consumption are discussed from a social ecological perspective, making an emphasis on the heuristic potential of the social satisfaction curve in order to explain the man-environment interaction involved in household EP consumption