Perhaps elimination of energy-intensive back-up nav equipment is part of an initiative to reduce Savonlinna's GHG emissions ...
The facility is scheduled to close for renovations from 2022.05.02 to 2022.06.24. From a
FINAVIA announcement:
.
“Savonlinna Airport is carbon-neutral. Using LED lights to replace our runway lighting system enables us to improve the airport’s energy efficiency and reduce emissions."