7.2. Extension of transmission line: case B
The other energy supply scenario is to extend the transmission
line which is x meters away from the location where the hybrid
system is assumed to be installed. The location where the GSM
base station is installed and the hybrid system is assumed to be installed
is right by the Aegean Sea and has a hilly topography. It has
several hills with 15–25% incline. These hills are covered with typically
Mediterranean bushes. Soil depth is very low and not suitable
for vegetation. Fig. 10 shows the site on Izmir map.
The total cost, for this scenario, changes according to the length
of the transmission line. This cost is sum of operation cost and
investment cost [32]. Operation costs of the grid system are the
electricity consumption fee and the maintenance costs. Sum of
the transformer and transformer pile, power panel, separator, project
development costs are considered as the fixed cost whereas
the pile, conductive wire, insulator, grounding, and labor costs
are considered as the variable cost in the initial investment cost.
The fixed cost is calculated for 50 kV A power demand in the case
study. The cost values are obtained from the Turkish Chamber of
Electrical Engineers and Turkish State of Electric Distribution. Grid
line components and their costs are given in Table 7.
Total cost of the extension of transmission line case is yielded as