PT Elnusa Tbk (ELSA) is energy service solution company in upstream oil and gas services, energy distribution and logistics services, and supporting services. It was established in 1969 under the name PT Nusantara Electronics. Initially, the company was to support operations of PT Pertamina (parent company) to maintain equipment and communication tools for its oil ships. In the early 1970s, the company expanded its business by establishing the Seismic Data Processing Division. With its growth, it went IPO in February 2008.