Energy and/or material transport including phase change

A method for transporting energy and/or material, comprising:

• providing or forming a first gaseous fuel at a first location and a first elevation;
• transporting the first gaseous fuel from the first location to a second location having a second elevation;
• reacting the first gaseous fuel to form a first liquid fuel at the second location;
• transporting the first liquid fuel from the second location to a third location having a third elevation;
• extracting energy with a turbine from flow of the first liquid fuel from the second location to the third location;
• reacting the first liquid fuel to form a second gaseous fuel at the third location;
• transporting the second gaseous fuel to a fourth location having a fourth elevation;
• reacting the second gaseous fuel to form a second liquid fuel at the fourth location;
• transporting the second liquid fuel to a fifth location having a fifth elevation;
• and
• extracting energy with the turbine from flow of the second liquid fuel from the fourth location to the fifth location, wherein a pressure from providing or forming the first gaseous fuel accounts for all or a portion of an energy used to transport the first gaseous fuel from the first location to the second location, and a pressure from forming the second gaseous fuel accounts for all or a portion of an energy used to transport the second gaseous fuel from the third location to the fourth location.

A system for transporting energy and/or material, comprising:

• a first conduit extending from a first location to a second location;
• a first reactor at the second location configured to react gaseous material to form liquid material;
• a second conduit extending from the second location to a third location;
• a second reactor at the third location configured to react liquid material to form gaseous material;
• a third conduit extending from the third location to a fourth location;
• a third reactor at the fourth location configured to react gaseous material to form liquid material;
• and
• a fourth conduit extending from the fourth location to a fifth location, wherein the second location has a higher elevation than the first location, the third location has a lower elevation than the second location, the fourth location has a higher elevation than the third location, and the fifth location has a lower elevation than the fourth location.