Question: how much energy is used to produce lng?
Answer: Examples presented in literature show that liquefaction process needs 700-850 kWh of energy for liquefaction of 1 kg of LNG (2.5-3 MJ/kg). The most common probably value is 2.9 MJ/kg. It should be considered that about 0.85 MJ/kg is stored in LNG as "cold energy".