This project has the objective of introduce the concept of future contracts of electricity, your characteristics and motivations to be widely used in companies that are electricity consumers such as encouraged for generators as well. Due to this contracts importancy for company profits, electricity consumer or generator, analysis about your valuation are necessary and useful for pick the fair contract price that conciders both sides of contract risk. For this analysis, in this specific project, linear models are implemented in Julia programming language to calculate the Generator and consumer companies revenue in different scenarios of spot prices and generation, considering a specific power plant, during a stipulated period to use as support decision to ideal portifolio of contracts, based on real data of existing contracts.