Method for estimating and adjusting an energy balance of a gas in liquid form contained in at least one tank of a floating structure intended to deliver said gas in liquid form to a given place of destination, the floating structure comprising a system for supplying fuel to a consumer of the floating structure capable of carrying out a function of condensation of a gas phase generated from the gas in liquid form and/or a function of cooling the gas in liquid form, characterized in that the estimating and adjusting method comprises the following steps: - a step A of calculating the maximum authorized temperature of the gas in liquid form contained in the tank on arrival at the place of destination, based on the maximum saturation pressure requirements of gas in liquid form of the place of destination and the characteristics of the gas in liquid form contained in the tank, - a step B of establishing a first operating plan for the condensation function of the gas phase generated from the gas in liquid form carried out by the supply system until the arrival at the place of destination, said first operating plan being established from an estimate of an excess gas phase generated from the gas in liquid form in the tank during a journey, - a step C of establishing a second operating plan for the cooling function of the gas in liquid form carried out by the supply system until arrival at the place of destination, said second operating plan being established from the estimate of the excess gas phase generated from the gas in liquid form during the journey, - a step D of calculating an energy balance of the gas in liquid form at a time t from the temperature of the gas in liquid form contained in the tank and the properties of the gas in liquid form contained in the tank, - a step E of calculating a maximum energy balance (32, 33) from the maximum authorized temperature of the gas in liquid form, calculated in step A, and the characteristics of the gas in liquid form contained in the tank, - a step F of estimating the energy balance of the gas in liquid form contained in the tank on arrival from the journey from the operating plans (36, 37) of the condensation and cooling functions determined in steps B and C and from the energy balance of the gas in liquid form at time t, determined in step D, - a step G of adjusting the first operating plan and/or the second operating plan, - a step H of implementing the supply system according to the operating plans (36, 37) of the condensation and cooling functions of the gas in liquid form adjusted in step G. - a step A of calculating the maximum authorized temperature of the gas in liquid form contained in the tank on arrival at the place of destination, based on the maximum saturation pressure requirements of gas in liquid form of the place of destination and the characteristics of the gas in liquid form contained in the tank, - a step B of establishing a first operating plan for the condensation function of the gas phase generated from the gas in liquid form carried out by the supply system until the arrival at the place of destination, said first operating plan being established from an estimate of an excess gas phase generated from the gas in liquid form in the tank during a journey, - a step C of establishing a second operating plan for the cooling function of the gas in liquid form carried out by the supply system until arrival at the place of destination, said second operating plan being established from the estimate of the excess gas phase generated from the gas in liquid form during the journey, - a step D of calculating an energy balance of the gas in liquid form at a time t from the temperature of the gas in liquid form contained in the tank and the properties of the gas in liquid form contained in the tank, - a step E of calculating a maximum energy balance (32, 33) from the maximum authorized temperature of the gas in liquid form, calculated in step A, and the characteristics of the gas in liquid form contained in the tank, - a step F of estimating the energy balance of the gas in liquid form contained in the tank on arrival from the journey from the operating plans (36, 37) of the condensation and cooling functions determined in steps B and C and from the energy balance of the gas in liquid form at time t, determined in step D, - a step G of adjusting the first operating plan and/or the second operating plan, - a step H of implementing the supply system according to the operating plans (36, 37) of the condensation and cooling functions of the gas in liquid form adjusted in step G.