Foam cement i s a versatile and economical light weight cementing slurry that can be used in geothermal wells. Ultralight foam cement slurries develop useful compressive strength and can be used for primary cementing infragile formation intervals and lost circulation areas. Successful circulation of a full column of cement is practically assured with the proper use of foam cement. Geothermal foam cementing success is dependent upon proper applications, slurry design, and cementing procedures. These points will be covered along with the result s of foam cementing at The Union Geothermal Of Indonesia, Gunung Sal ak Project, West Java, Indonesia.