 To obtain sufficient water flow, additional fields were developed at Botn in 1980, Glerárdalur SW of the town in 1981, and Þelamörk north of the town in 1992.Water temperature is generally but can drop to during hot summer days.The cost of geothermal production is, at 32 mill/kwh, higher than the Icelandic national average of 11, but slightly less than the cost of imported heating oil.