Particle energy

Solar power

A good investment for the environment and you also have the opportunity to make money from your production.

solar power

Solar energy is a brilliant endless source of energy, albeit limited by seasons and time of day. Although it is hard to believe on some grey winter days, Sweden actually has good solar conditions. Solar cells are a good investment for anyone who wants to contribute to the transition we all have to make to phase out fossil energy sources.

For those of you who are considering installing solar cells, we have collected information on how to proceed and where to turn for advice. And of course, also how to do it if you want to sell your excess electricity to us!

About solar

Solar panels have a long lifespan and require minimal maintenance. They are efficient and virtually maintenance-free. Investing in solar panels can increase the value of your property and can provide a competitive advantage in the event of a sale.
If everyone who could installed solar cells, we would take a big step towards more sustainable energy production.

At the beginning of 2025, we will have nearly 1 connected solar cell systems in Partille.
Together, these supply surplus electricity to the electricity grid of approximately 6 kWh/year.

Plan & calculate

Start by finding out what conditions your house has. Then it's time to review how much electricity you consume and make a calculation. What shadow-free roof areas do you have that face south? The optimal direction is due south with a roof angle of around 40 degrees. In worse conditions, for example a 20 degree slope and the roof facing southeast or southwest, you will still not lose more than 10%. 

If your roof is older than 25 years, you may need to review its condition and address any renovation needs. The load-bearing capacity of the roof is usually not a problem, but should be checked by the solar supplier or other appropriate expertise. 
Feel free to review your property's solar cell potential at Google Maps.

To get the best compensation for your excess electricity, you should not produce more electricity than you consume on an annual basis. We usually suggest having a good margin. A lot can happen in the long term; a heat pump is installed, more efficient equipment, the family gets bigger or smaller, etc.

A system that covers up to 80% of your current consumption is usually suitable. Consumption is limited, especially for those who only have household electricity, to around 5 kWh/year. If you have some form of electric heating, with or without a heat pump, you normally have a good margin. 

Keep in mind that electricity consumption may decrease with energy efficiency improvements, while electricity demand may increase with future electric car charging.

You can measure the roof yourself and how many panels will fit. First use a satellite image of e.g. Google Maps where there are also measuring tools.
 
One panel measures 1,1 x 1,75m. For more accurate measurements, use a house plan or a tape measure on the roof, but be careful if you are going to climb up!

Some key figures: • A panel, 1,95 m410 has an output of 1W • Each kW (000 W) provides 950 kWh of energy per year. Under perfect conditions in the coastal strip +10%, inland with a worse direction of the wind -10%. • So, 1 kW provides 950 kWh/year with a panel area of ​​approximately 4,75 mXNUMX.
Your payback period may seem long, but you have a system that will produce electricity for 30–40 years, with no moving parts, nothing to wear out, and nothing to break.

The inverter may need to be replaced after 15 years, otherwise maintenance is limited to some flushing. And the increase in value of the house will historically be at least the same as the investment cost.

Choose a solar installer

Contact at least three solar installers and ask for a quote for your specific property. This should include the make of the panels and inverters, as well as a breakdown of the cost of materials and labor. 

It is important that all costs are included, for example for visualization of production and any costs if your meter needs to be moved.

Private individuals can receive a tax reduction for investments in green technology. You receive a tax reduction of 20% for material and labor costs (max. 50 SEK/year). You will receive your financial support directly on your invoice from your installer. 

Check what applies to building permits in Partille municipality. You can use the quote you received from the supplier if building documents are requested. 
Before an installation, it's smart to inform your neighbors about your plans. Maybe there are others in your area who would like to join in on a procurement?

The most important thing is that you trust your chosen solar installer. The system will last for 30–40 years and it is important that it is done right from the start. The installer will help you with contacts with the electricity company regarding pre-registration and commissioning of the system.
What you output online and receive compensation for, along with your net consumption, you can follow on My pages.

Once the solar cells have been installed, and before you start producing, your electricity meter needs to be activated so that it measures both consumption and production. We, as the electricity network company, do this when we have received a completed notification from the electricity installer.

Sell ​​your surplus electricity

As a producer, you receive compensation from us for the grid benefit you create in the electricity grid with your production plant. You can also sell your surplus electricity to your electricity supplier. You are a micro-producer if your solar cell plant is connected to the low-voltage grid at 0,4 kV. The plant may have a maximum installed power of no more than 43,5 kW and a meter fuse of no more than 63 A.

If you have an electricity grid agreement with us and you have installed a solar system, we will activate bidirectional metering in your electricity meter free of charge so that it measures both consumption and production. If the solar system's output is a maximum of 43,5 kW and the main fuse is a maximum of 63 A, the feed-in is free of charge. You will also receive compensation from us for your transmission of electricity, so-called grid benefit.

Current transmission compensation for network benefits

8,75 öre/kWh

Transfer (network benefit) incl. VAT

7,00 öre/kWh

Transfer (network benefit) excl. VAT*
*Read more under Tax rules

Sell ​​your excess production

You can sell your excess electricity production to an electricity trading company. You can also sell the guarantees of origin that you receive for your renewable production to the electricity trading company.

tax rules

If the plant's output is less than 500 kW, you do not have to pay any energy tax for your production.

Special tax rules apply to those who produce renewable electricity by, for example, installing solar cells on a property and supplying electricity to the electricity grid. There are different rules depending on whether the solar cells are installed on a private home or on a building that is part of a business.

Tips for more information

 Solar portal
On the Swedish Energy Agency's website Solar portal You will find more information and independent guidance on what applies when installing solar panels.

the Tax Agency
On The Tax Agency page contains more information about the tax rules that apply and calculation examples for different scenarios.

Installation and connection to the power grid

This is the workflow for the technical installation and connection to the electricity grid. Partille Energi Lerum Energi in operation and maintenance issues for the electricity grid. Your installation matter will therefore be handled by their staff on our behalf.

Choose an installer/supplier

There are several solar panel suppliers. Keep in mind that the company you choose
will carry out the work must be registered with the Swedish Electrical Safety Authority for the activity type "Electricity production facilities"

Before installation

Once you have contacted an authorized solar cell supplier or installer, they will make a pre-registration to Partille EnergiWe use a web-based system called Installatörswebben for contacts with installers. The installer usually has a good idea of ​​which documents to submit.

Clear sign from us

Once we have received a pre-registration, we will normally respond within 5 working days*. If everything is in order, we will send out an installation permit that gives the installer the go-ahead to carry out the work. If the pre-registration contains missing information, the installer may need to submit additional information.
*During the holiday period, the processing time may be longer than 5 working days.

After installation

When the installer has completed the installation, he or she must submit a completion report to us via the installer website. We will then make a final check to see if we need to take any action in the system before production can be switched on. We will also activate a function in your electricity meter so that it can register production. The installer will then receive approval from us that the system can be put into operation. Please note that it is illegal to start your system before you have received approval from us.

Facility registration

In our customer information system, the solar PV system receives its own system ID for registering and reporting the production of solar electricity. Once the system is registered, you can follow your production on My Pages.
NOTE: Only the electricity that is delivered to the electricity grid, the so-called surplus electricity, is measured and reported by us.

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