7.3. Break-even analysis results
To be able to compare the life cycle cost values of the both,
autonomous hybrid energy system and extended transmission line,
the economical life of the systems are equalized to 40 years. Therefore,
the hybrid system is renewed once after 20 years of operation.
Detailed comparison of the autonomous hybrid energy system and
extended transmission line costs for 4000 m distance between
national electricity network and the location where the hybrid system
is assumed to be installed is seen in Table 8.
Here, the location where the hybrid system is assumed to be installed
is around 4000 m far away from the electricity network.
Therefore, as seen in Table 8, the extension of the transmission line
is calculated as 4000 m. and obtained as 15.66% greater than the
hybrid energy system. So, here extension of the transmission line
is more economic than the hybrid energy system. In order to find
out the optimum extended transmission line distance, where the
hybrid energy system becomes economic, break-even analysis is
performed. In the break-even analysis, decision variable is the distance
between GSM base station location where the hybrid energy
system is assumed to be installed and the national electricity network.
This distance is found by equating the costs of above mentioned
two cases. The intersection point of is found to be 4817 m.
If distance between the national electricity network and the GSM
base station location where the hybrid system is assumed to be installed
is longer than 4817 m, installation of the hybrid energy system
becomes more economical than the transmission line. The
graphic form of this result is shown in Fig. 11.
In this study, when comparing the two alternative systems,
intangible effects e.g., the positive effects of the hybrid energy system
to the environment, clean, renewable etc., are not considered.
Therefore, 15.66% expensiveness of the hybrid energy system can
be ignored and this system can be chosen as the electricity supplier
for the GSM.