Overhead electrical power transmission line

A method for providing an installed dead-end-to-dead-end overhead electrical power transmission line, the installed dead-end-to-dead-end overhead electrical power transmission line comprising:

• first and second dead-end towers;
• at least one suspension tower between the first and second dead-end towers;
• and
• an overhead electrical power transmission conductor tension section having a length of at least 100 meters, and having a first end attached to the first dead-end tower and a second end attached to the second dead-end tower,
• the method comprising:
• providing first and second dead-end towers;
• providing at least one suspension tower between the first and second dead-end towers;
• and
• selecting an overhead electrical power transmission conductor tension section having first and second ends and a length of at least 100 meters, the overhead electrical power transmission conductor tension section comprising at least a first and a second sequential overhead electrical power transmission conductor tension subsection, wherein the first overhead electrical power transmission conductor tension subsection has a first coefficient of thermal expansion, a first density, a first stress-strain behavior, and a first cross-sectional area, wherein the second overhead electrical power transmission conductor tension subsection has a second coefficient of thermal expansion, a second density, a second stress-strain behavior, and a second cross-sectional area, wherein intentionally at least one of (a) the first and second coefficients of thermal expansion, (b) the first and second densities, (c) the first and second stress-strain behaviors, or (d) cross-sectional areas, at temperatures in the range from 20° C. to 75° C., are different such that, over at least a temperature range 20° C. to 75° C., as current flow increases through the overhead electrical power transmission conductor tension section, wherein the tension of the second overhead electrical power transmission conductor subsection is higher as compared to the tension of the second overhead electrical power transmission tension subsection under the same conditions when the entire conductor tension section consists of just the conductor of the second overhead electrical power transmission conductor tension subsection;
• and
• installing the selected an overhead electrical power transmission conductor tension section, wherein the first and second ends of the overhead electrical power transmission conductor tension section are attached to the first and second dead-end towers, respectively, and at least a portion of the sequential overhead electrical power transmission conductor tension subsection being supported by the suspension tower.