PT. PLN Region Sumsel, Jambi and Bengkulu use IT services in order to properly manage its business processes. The absence ofa mechanism for third-party performance measurement make it difficult to measure the performance of third parties.This study aimed to address the various problems that exist in there. The first phase of this research will be done by outlining strategies with SWOT analysis, which produces a portfolio of IT services. The next stage is the provision of recommendations on the strategic sourcing in developing IT services in the company by analyzing the current condition of the company. In the final stage of research, we will clarify the mechanisms in measuring the availability of IT services with COBIT 4.1framework, DS1 sub segments. From the research results obtained a portfolio of IT services that can effectively support the company. The study also produced findings that shows the company has not been able to manage their own IT services internally, so the development of IT services should be done through outsourcing. Formulation of the SLA is also proposed in this study, so that can be used to measure the performance of IT service management company.