Rooftop photovoltaics on an apartment building: how electricity sharing works
Since 2024, owners in an apartment building can share electricity from a common rooftop plant. What it means for an HOA and how to approach it practically.
Until recently, photovoltaics on an apartment building only made sense for common areas — corridor lighting and the lift. An amendment to the Energy Act enabled so-called electricity sharing: power from a common plant can be split directly among individual flats.
How sharing works
The building installs a rooftop plant (typically 20–50 kWp) and each participating flat gets an allocation key — for instance by ownership share. Generated electricity is distributed among flats in real time via the EDC data centre; surplus is sold to the grid.
What it brings in numbers
A flat consuming 2 MWh a year can cover roughly 20–35% of its consumption through sharing — depending on roof orientation and household behaviour. At today's prices that means savings in the thousands of crowns per flat per year; the PV subsidy for apartment buildings additionally covers a significant part of the investment.
What to watch out for
The keys are approval at the owners' meeting, the technical state of the roof (ideally combine PV with its reconstruction or insulation) and a fairly set allocation key. We're happy to prepare the technical design and voting materials — from roof statics to operating economics.
