Renewable energy from your own roof with solar panels

Panels suitable for every type of roof

Solar panels are suitable for detached and terraced homes as well as apartment blocks, regardless of the type of roof. Our system components have been selected especially for the Finnish conditions, with specific mounting systems for different roof types. Our solar panel packages are always tailored to meet the customer's needs.

Self-sufficiency with new technology

Solar panels offer increased self-sufficiency with clean electricity generation. The new technologies we offer, such as electricity storage systems and control services, enable future development and expansion of the systems.

Solar energy is a worthwhile investment

Solar power is predicted to be one of the most favourably priced electricity production methods in the next few years. A solar power system will pay itself back already during its warranty period when we dimension it according to your actual electricity consumption. With the rising interest in solar power, solar panels will increase the value of your home in the housing market.

Three reasons to acquire solar panels from Helen

  1. You will receive everything you need for generating solar energy and increasing your self-sufficiency from one reliable supplier, now and in the future.
  2. With your own solar power plant, you will produce electricity ecologically and reduce your carbon footprint.
  3. Helen has over a hundred years’ experience in the energy sector, and our expertise in solar energy is second to none. We have built major solar power plants in Helsinki and connected the largest electricity storage facility in the Nordic countries to a solar power plant. Our customers also have an opportunity to rent their own solar panels. We carry out continuous research and development work.

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Selection of a panel package

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In Southern Finland, the annual output of a solar photovoltaic system with a 1,100 Wp system at an angle of 30–45 degrees is about 900 kWh. Total annual output in the southern parts of Finland is about the same as in Northern Germany.

Annual amount of solar radiation (click to open the picture)

Wp stands for the peak output of the system in watts and kWp in kilowatts.

The solar panels come with an inverter, which is a device that converts the direct current produced by solar electricity into alternating current so that it can be used and fed into the electricity network. You can monitor on the device how much electricity has been produced. 

In the solar power inspection, we dimension the system according to your need. You will benefit the most from your solar photovoltaic system when all of the energy produced can be utilised in connection with the installation property, and therefore it is worth carrying out the dimensioning on the basis of normal property-related consumption. For example, during a holiday period, the consumption may be smaller than production and there will be enough surplus production to feed to the network. Therefore, it pays to draw up a sales contract with us with regard to surplus electricity.

Allocating electricity consumption is easier in a three-phase system than in a single-phase system. The three-phase system operates in the same way as network electricity and there is no need for changes related to the load allocation that may be necessary in a single-phase system. In a single-phase system, you have to choose the phase of the electrical centre where the system production is allocated to.

Purchasing a solar power system

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In a solar power inspection, the most suitable solar photovoltaic system for the customer is designed and an offer on the installation work and equipment, including installation accessories, is made according to the specifications of the installation site.

You can deduct the share of installation work on your solar power package from the tax you pay. It is possible to receive tax credit for domestic costs up to the value of €2,250 in 2022. Our invoice includes itemisation of the share that is eligible for tax credit for domestic costs. You can make a tax deduction of 50 per cent of the installation costs from the total price of the solar photovoltaic system, and the excess is €100. Further information

Usually there is no need to apply for a separate action permit when the panels are installed parallel with the roof and the building is not marked for preservation. The operating models of different local authorities have not been harmonised yet, and therefore it is worth checking the matter with the building supervision authority of your own municipality before placing an order for a solar photovoltaic system.

Output and use of your own solar power plant

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In order to operate, a photovoltaic cell does not need direct sunshine as it also develops electricity on a cloudy day. No solar energy is produced at night, and that is when the required electricity is taken from the electricity network. The biggest benefit and savings will be gained when you only consume electricity when the solar panels are producing it.

It is always worth positioning solar electricity panels so that they will not be in shade. Trees and structures that overshadow the panels will diminish the production of the system. It is more useful to rather build a smaller solar photovoltaic system than one with a larger nominal production which, however, will be partially in shade.

In practice, solar panels are maintenance-free and it is not necessary to clean them in any special way. Pollen washes away along with rainwater.

If the production of a solar photovoltaic system is higher than the property consumes, the surplus production will be fed back into the network. For the surplus electricity, Helen will pay an hourly price in accordance with the Finland price area on the Nordic electricity exchange (Nord Pool Spot). Draw up a sales contract by sending us an email to

Connecting to the network

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The systems we offer are 230 V systems connected to the network, and their surplus electricity is not stored in accumulators, but fed to the network. Therefore, it is necessary to have an electricity connection at the installation site.

Unfortunately, a solar photovoltaic system connected to the network is not suitable to be used as reserve power because in an electricity network fault situation the solar photovoltaic system is automatically switched off in order to ensure the safety of the workmen repairing the system. 

See also

Delivery of panels

We can help you in the acquisition of a solar power system and panels with installation, meeting your individual needs.

Selling surplus electricity

Draw up a contract with us on selling your surplus electricity.

The easiest way to get solar panels

We deliver solar panels to your roof as a turnkey service, so all you need to do is switch the electricity on and enjoy the inexhaustible energy of the sun.