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Energy savings advice - Medium Voltage

Cutting down on energy costs has always been one of the most important factors for the competitiveness and, therefore, profitability of industries. In that context, please find below some methods that can help you ensure significant savings on your monthly electricity bill.

Having an energy monitoring system in place

The purpose of energy monitoring systems is to gather important information on the energy profile of a facility. Being aware of the impact of each machine on the overall facility is a necessary tool for more efficient use and for preventing the simultaneous use of energy-consuming machines. Finally, it allows for the early identification of potential failures and malfunctions that can cause significant damage to the undertaking.

Reactive power offsetting

Reactive power (KVAr) does not produce effective work, However, it is used by inductive loads (e.g. engines) to generate their electromagnetic field, which is necessary for their operation. Reactive power is shown in the electricity bill through the cosφ. The cosφ is in the denominator of either fraction in the Network Use Charge. A low cosφ (e.g. 0.50) means a significant increase in the charge concerned, in the electricity bill, whereas the optimal result is achieved when it is close to 1.

Compensation capacitors are typically used to achieve the optimal result. State-of-the-art reactive power compensation systems that include capacitors are tailor designed and built for the intended system, after a study is carried out and special measurements are taken by suitable electronic instrumentation.

Preventing the operation of energy-consuming machines during peak hours

‘Peak hours’ means the time between 11:00 and 14:00 in the period of consumption days. ‘Maximum Peak’ (MA) means the maximum demand for capacity during peak hours. The MA occurs in the Transmission System and Distribution Network Use Charges in accordance with the following formulas:

ΧΧΣ =[ΜΑ (kW) x (€/kW) x (Ημέρες/30)] όπου

MA: Maximum Measured Demand during Peak Hours (11:00-14:00) in the period of consumption days.
€/kW: Unit Capacity Charge
Days: the number of days of the consumption period

ΧΧΔ= [ΜA(kW)x ΜΠΧ(€/kW) x (Days/30)] + [(kWh) x MMX(€/kWh) /cosφ]

MA: Maximum Measured Demand during Peak Hours (11:00-14:00) in the period of consumption days.
ΜΠΧ (€/kW): the Unit Fixed Capacity Charge
Days: the number of days of the consumption period
kWh: the measured absorption of energy in the consumption period
MMX(€/kWh): the Unit Variable Power Charge
cosφ: the mean value of the facility’s power factor in the period of consumption days, where cosφ = [1/(1+(Idle/Active)²)]½.

Therefore, preventing the operation of energy-consuming machines, let alone their simultaneous use during peak hours, is a significant factor for ensuring savings in the monthly electricity bill from these two cost centers.

Start and operation of energy-consuming machines during low demand hours ‘Low demand hours’ means the period between 23:00 and 7:00 on business days and all the hours on weekends and holidays. In the relatively rare cases of industries operating only during low demand hours, there is no Capacity Charge made in the competitive part of the tariffs. Moreover, the industry benefits from the reduced tariffs charged for energy during low demand hours.

For further information, contact the Large Customers Department by calling 213-0333000.