The Reykir geothermal areas in Mosfellssveit has been utilized since the early 20 th century and has been one of the main production areas of Reykjavík Energy from the beginning of systematic district heating.
Reykjasvæðin hafa verið nýtt til jarðhitavinnslu frá upphafi 20. aldar og hafa verið ein helstu vinnslusvæði Orkuveitu Reykjavíkur allt frá upphafi hitaveitunnar.