With the energy shortage, which has become one of the most fundamental problems today, two issues have gained great importance;

1. energy production and its cost,  2.more efficient use of available resources (energy savings).

There is a certain initial investment cost to establish a new power generation facility, revising a facility to save energy is also a certain investment.However, the only parameter to be considered here should not be the initial investment cost required for the revision of the existing system.If the cost of energy usage decreases after the modernization of the system, the calculation should be made wisely in how long it will pay off the investment cost.Indeed, many modernization processes, which seem to have a substantial initial investment cost, are actually free of charge due to the reduction in operating costs in a short time, and will even leave a profit.