Trigeneration is a simultaneous production of heat, power and cooling, where a fraction of the shaft work or residual (waste) heat is used for driven a refrigeration systems (technologies) – absorption, adsorption or ejectors cycles. It is like an extended cogeneration, but is becoming economically viable thanks to the commercial spread of absorption cooling systems. In fact, a well-projected trigeneration plant can achieve better results than cogenerative one. The results of investigations show that trigeneraton have advantages over single electricity generations and cogenerations: the total energy efficiency is higher, the emissions of CO2 and the other waste gases are lower and it has more useful energy outputs. This kind of energy production has both of the economic and environmental merits. One of the way how to research and investigating trigeneration is (users) load analyses using linear programming, mathematical models or modeling load fluctuation and its influences.