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Baja California Sur (BCS) is an isolated and arid state in Northwestern Mexico. Departing from a global and national framework, the state’s trends and characteristics of electricity consumption, generation and policies and factors modeling these are depicted. The trends of parameters such as energy intensity of GDP, GHG emissions by energy unit produced, and share of renewables are first analyzed. Then, a test for detecting a decoupling of electricity consumption from weather is carried on, using correlation in subsets of time series together with statistical trend detection, for assessing an overall state-level change, instead of punctual savings or estimations, which is attributable to building and appliance efficiency standards. The work focuses on the residential and tourism sectors, which demand above 70% of the electricity in the State, intending to develop an approach to regional scale change assessments, instead of estimations or punctual saving calculation in warm regions, with a comprehensive data input requirement for developing countries. The findings show that GDP has grown slightly more energy intensive, the share of renewables in the mix has diminished, and, in spite of punctual savings from demand side management measures, due to an overall increase in air conditioning and other devices penetration, there is no significant decoupling in energy consumption from temperature, a main driver of consumption in BCS, where total summer demand is about 50% greater than that of winter and the state which ranks second in non industrial GHG emissions per capita in Mexico. Implications in GHG emissions and development of policies seeking to mitigate climate change are discussed.