Main points of the article: 

  • What exactly is net-metering or net metering
  • During “life” pv 25 years
  • Surplus energy is stored for three years
  • Sizes of photovoltaic depending on the business or residence
  • The differentiation in the islands
  • Any zero cost supply
  • Saving money every time
  • Implementation time is approximately 2 months
  • Supporting documents required and how to take the first step

The transition to green energy, particularly with the net metering to homes and businesses, is one of the most important topics of discussion in the last few years. References to photovoltaic systems and renewable energy sources are a daily occurrence in newspapers, tv and radio, creating a hazy landscape on whether this is indeed a feasible solution for everyone, or if the output power remains a privilege of the few.

The technology development of pv has turned, indeed, the production of energy in an affordable solution. In contrast to previous years that the costs were to dizzying heights for anyone who wants to reduce and, why not, to reduce to zero the cost of the power required for the operation of the business or the home. This is achieved through net metering, which is today and tomorrow in the production of energy for their own consumption.

Terminologies such as “net metering” and information that are included in most articles, there are many times understood to the reader. This has as a result of the created more questions and by extension objections. Through this article we will try to make it understood what is the net metering photovoltaics, how they work and how to translate financial data for homes and businesses. 

What it is and how it works net metering;

With the term net metering, or energy clearing, we mean the set-off of the energy produced by the photovoltaic system, and this is consumed on the property that has been carried out the installation. The specificity of the energy clearing lies in the fact that the liquidation of the account is carried out every three years. Therefore, the energy generated by the photovoltaic system, which is not consumed directly, is not lost. On the contrary, it remains available for consumption for the remaining period until we complete the three-year period. That is the producer of energy with the ability to use it when you need it. If, for example, a house or a company produces 1.150 kilowatt hours of energy the month corresponding to the installation of photovoltaic 10kW and consume 980 kilowatt-hours, then the remaining 170 kilowatt-hours of “saved” and will be available for consumption within the next three years.

The counting of the energy produced by the photovoltaic system as well as incoming from the Network of energy are the responsibility of the HEDNO. The energy supplier is responsible for the process of clearing, on the basis of data received from the measurements of the HEDNO. This is the reason why, a 25-year term, netting contract is signed with the provider of electricity and not by HEDNO, in which, however, becomes the connection request of the system to the network. In the event of a change in provider, the new contract has a duration equal to the residual of the 25-year period of time. If, for example, a house or a company has net metering photovoltaic system for ten years and decided to change energy supplier, then the new contract will be valid for 15 years.

A surplus of energy at the end of three years is lost

Είναι σημαντικό να τονιστεί, ότι στο τέλος της 3ετίας τυχόν πλεόνασμα παραγόμενης ενέργειας δεν αποζημιώνεται από τον πάροχο αλλά χάνεται. Συνεπώς, για την επίτευξη του βέλτιστου ισοζυγίου απόδοσης και κόστους, η εγκατάσταση του φωτοβολταϊκού συστήματος θα πρέπει να έχει μελετηθεί κατάλληλα προκειμένου το περίσσευμα ενέργειας να είναι το ελάχιστο δυνατό. Για αυτόν τον λόγο θα πρέπει να επιλεχθεί και η κατάλληλη εταιρεία μελετητών, όπως η ΙΩΝΙΚΗ Renewables, που διαθέτει μεγάλη εμπειρία σε μελέτες και εγκαταστάσεις φωτοβολταϊκών. 

What photovoltaic system can I put it?

The maximum power of a photovoltaic installation for energy clearing depends on the agreed power supply and is subject to certain restrictions as regards the size of the system that can be installed in each property, while also depends on the area of installation of the system.

Since this is a professional space the power of the photovoltaic system may be up to 20kW or up to half of the agreed upon power, in the case that this is more than 20kW. For example, if the agreed-upon power-consumption is the 35kVA (providing Nthe3) can be installed photovoltaic system up to 20kW while if the agreed power is the 55kVA, then, can be installed power system 27,5 kW. Respectively, if the system will be installed regard to residence then the maximum allowable limit, in the case that there is a three-phase supply, formed in the 10kW while if the supply is single-phase, then it is allowed to install up to 5kW. Read here the factors that you need to count before you make the purchase and installation of a pv for housing. 

How can I determine if the supply is three-phase single-phase;

Can you yourself can determine easily if the supply is three-phase or μονοαφασική. You have to do is check the agreed force shown in the account of your provider. In the event that the listed kVA is from 8 to 12, then it is a single-phase supply, while if it exceeds 12, then this is for three phase.

What is the net metering on the islands?

If the installation of the system is to be carried out in any of the non-interconnected Islands, then the limits are reduced. The margin on these islands is quite smaller. In more detail, for houses allowed the installation of photovoltaic systems up to 5kW. For professionals, the limit of 20kW falls in the 10kW or 50% of the agreed power.

However, in addition to the limits placed by the applicable legislation, an important role in the final selection of the system plays and the volume occupied by the installation. On the basis of recent technological developments, it is estimated that each kW installed requires an area equal to 5 sq.m. free surface. Therefore, it is quite safe to say that a solar panel system 10kW for house needs at least 50 square meters unallocated space.

Net metering: The electric bill can be reduced to zero, provider no.

The Net Metering under conditions that may reset the cost of power for a residence or a business. I can, however, reset fully account that comes from the provider. This is due to the fact that the regulated charges and fees shall continue to exist. The example below shows the differences for a residential client who has not proceed with the installation of a photovoltaic and a αυτοπαραγωγό system 5kW while we assume that in both cases a year are needed 8000kWh.

Χωρις φωτοβολταϊκο
ME φωτοβολταϊκο
Παραγόμενη ενέργεια
Απορροφώμενη ενέργεια από το δίκτυο
Εγχεόμενη ενέργεια στο δίκτυο
Συνολική κατανάλωση
Χρεώσεις προμήθειας ΔΕΗ
Χρέωση Παγίου Παροχής
Χρέωση Ενέργειας
Σύνολο χρεώσεων προμήθειας
Ρυθμιζόμενες Χρεώσεις
Μοναδιαία Πάγια χρέωση ισχύος
Μοναδιαία Μεταβλητή Χρέωση Ενέργειας
Σύνολο χρεώσεων δικτύου μεταφοράς
Μοναδιαία Πάγια χρέωση ισχύος
Μοναδιαία Μεταβλητή Χρέωση Ενέργειας
Σύνολο χρεώσεων δικτύου διανομής
Υπηρεσίες Κοινής Ωφέλειας (ΥΚΩ)
Ειδικό τέλος Μείωσης Εκπομπών Αερίων Ρύπων
Λοιπές Χρεώσεις
Σύνολο ρυθμιζόμενων χρεώσεων
Λοιποί φόροι και Τέλη
Ειδικός Φόρος Κατανάλωσης (ΕΦΚ)
Ειδικό τέλος 0.5%
Φ.Π.Α 6%

It is therefore understood that the account will not be reset, but the difference is evident as a photovoltaic installation, not to exceed 6.000€ to installation costs, saves a year on the 920€, achieving the depreciation to 6.5 years.

With simple math, in the above example, someone with a photovoltaic system at home, it pays in 55.6% (over half) is less money in a relationship with someone who doesn't have solar.

This means that, after the 6.5 years that will be needed to write off the just €6,000 spent in order to install the photovoltaic, will saves €920,40 time for 18.5 years, that is, a sum of the order of €17.027,40 which would otherwise be paid to the power supply, while now it will contribute to the family income.

What is included in an installation for net metering, and that can be fitted?

A complete photovoltaic system for energy clearing consists of the photovoltaic panels that are installed in special bases. It consists also of the inverter voltage and the energy meter of the energy produced. When the sunlight hits the solar panel generated electricity. The electricity led to the inverter voltage in order to turn the dc that has been produced in ac. Subsequently, the ac current passes from the power meter, and from the conventional clock that exists in each property before it is consumed or returned to the network. In this way completes the process of self-production, the whole or a part, of the electrical power required to operate a residence or a workplace.

The most common place to install a photovoltaic system is the top of the property or the roof. Nevertheless, the legislation allows for their installation on other structures as well as on the ground. For the territory, a necessary condition, to be located in the same space with the plant consumption of that fuel. This has as a result to allow for the installation of, for example, in the shelter of parking places, on the ground or even on the front of the building.

What are the conditions for the installation of a photovoltaic system for Net metering;

In order to carry out the installation of a photovoltaic system for energy clearing is a necessary condition for the existence of active permanent provision in the name of the member self-producer, which will replenish the property with a stream of the hours does not produce the solar system while you will have to proceed to payment or adjustment of accounts.

In addition, a necessary condition, as is natural, is the point that will be selected for the installation to be legitimate and is the property of the owner of the pv system or the νόμιμή use. In the case of a photovoltaic system is to be installed in a shared space like the roof of a block of flats, then one must ensure that the consent of all the co-owners of the building, either through a unanimous decision of the general meeting or by written agreement of each of the co-owners.

The potential in which the space in which it will be installed is hired, you need the consent of the owner. In the case of πολυιδιοκτησίας if the person holds the ownership, then it will require the consent of the beneficial owner. If the person concerned has the usufruct of the property then you can proceed to the installation without the requirement of consensus.

What are the documents required for authorisation and implementation time;

The licensing for the net metering is a simple process as long as preceded by the appropriate technical study. The documentation required for the filing of the folder they belong in the following two categories:

A. What gives the person a self-producer.

B. What creates the engineer who will take over the process.

Supporting documents submitted by the applicant for net metering

1. Ownership of the property.

2. Building permit or evidence of the legality of the building will be installed.

3. Last bill paid.

4. Written consent of co-owners, if any.

Supporting that creates/provides the engineer

1. Floor plan of the installation area with embossed the utility

2. Μονογραμμικό design installation.

3. Technical description of the project.

4. Technical brochures of the pv panels and the inverters that will be used.

5. Solemn declarations of the member self-producer and engineer.

In the space of two months, anyone can have net metering photovoltaic

It is estimated that, on average, part of the licensing needs less than two months. The closure of the installation depends on the size of the project. Empirically, we can say that in the space of two months anyone can become a self-producer of the power consumed in the enterprise or at home.

How much does a photovoltaic net metering;

The cost of a photovoltaic system depends primarily on the selection of materials will be placed. The country of origin of the inverters, the technology and the size of the panels that will be used and the total size of the installation, as well as other sizes for homes and others for business so the cost, are the main factors for the cost of a pv installation. On average, it is estimated that the cost of a photovoltaic system for net metering ranges from 1,000 €/kW without the F.E.A.

However, in addition to the cost of installation, there is the cost of connection of the photovoltaic power station in the network of the HEDNO. This depends on the type of provider, the size of the pv plant and the suitability of the consumption counter. The following is a synopsis of the cost of connection to the network.

Κοστος συνδεσης (€)
Επίπεδο τάσης σύνδεσης των εγκαταστάσεων των χρστών
Είδος παροχής
Ισχύς ΦΒ σταθμού παραγωγής
Χωρίς αντικατάσταση του υφιστάμενου μετρητή κατανάλωσης
Με αντικατάσταση του υφιστάμενου μετρητή κατανάλωσης
Χαμηλής τάσης
Εως και 5kW
Εως και 55kW
55kW εώς 100kW
Μέσης τάσης
Εώς και 100kW
100kW εώς 1ΜW

Is there a grant for the installation?

The transition to the production of energy through renewable energy sources and the increase of the percentage coverage of the needs of green energy are the primary concern for the European Union and its member states. In this context, there are often grants from state or community funds. The objective, the transition to more and more businesses and houses in the autoproduction of energy.

As far as businesses are concerned, in the ESPA that was completed in 2020, there was a 50% subsidy for those who chose to install photovoltaics. The grants that will be announced soon in the new ESPA are expected to fluctuate at similar levels. Accordingly, residences can be included in the Save - Self-Employment program which provided a subsidy of up to 85% of the investment amount of a photovoltaic system. The start dates of Execoonamo - Autonomo have not been announced yet but the information speaks of the end of the summer with the participants expected to be many in this phase of the program as well.

Therefore, there are solutions of a grant, whether for business or for housing, contributing to a significant reduction of the cost. 

I'm interested in net metering, where to begin?

Originally, the first thing they can do someone is concerned to address in one of the specialized offices of engineers are there in order to start the study of preparation of the pv plant.

The engineer, after you have completed the autopsy of the installation site, and collect information on the annual power consumption of the property, calculates the optimal size of the system that will both fit in the space intended to be installed and on the other hand, the produced power will be covering all the energy needs, where this is possible, without creating a surplus of power that will be lost at the end of 3 years old.

Subsequently, following the lodging of the application to the competent department of HEDNO accompanied by the required documents that are analyzed above.

If all the conditions are met, the HEDNO make the necessary Connection Offer, which is valid for three months. The Connection Offer is signed by the person concerned as pay the fee relating to the charge association.

Then the installation of the photovoltaic system to the point that has been defined by the study while at the same time the person goes in the conclusion of a contract for energy clearing with the supplier of the electricity with which it cooperates.

With the signing of the convention of the energy clearing the photovoltaic system is ready to operate and the person concerned is considered to be officially self-producer of the energy needed.  

Conclusion: businesses reduce operating costs, the residences save money

To sum up, the net-metering is an easy, quick and economical solution for businesses and residences. Businesses improve their competitiveness and reduce their operating costs. Domestic consumers will never worry again for the consumptions of them. The photovoltaic systems are an affordable luxury that everyone is entitled to and should be enjoyed in their daily lives.

Φωτοβολταϊκά από την ΙΩΝΙΚΗ Renewables: Δίπλα σας σε κάθε βήμα

Στην ΙΩΝΙΚΗ Renewables διαθέτουμε εμπειρία στη μελέτη και εγκατάσταση φωτοβολταϊκών. Έχουμε εγκαταστήσει φωτοβολταϊκά πάρκα, όπως επίσης φωτοβολταϊκά για κατοικίες και επιχειρήσεις σε όλη την Ελλάδα, ακόμη και σε νησιά. Αναλαμβάνουμε όλες τις διαδικασίες από την πιθανή χρηματοδότησή του, τη μελέτη, την κατάθεση του φακέλου, την εγκατάσταση και παραδίδουμε το φωτοβολταϊκό σας με το κλειδί στο… χέρι. 

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