  This research is about integration of information subsystems from:information
system procurement, financial information system, information system security,
technical information systems and legal information systems, and about their
mutual dependence and close connections in Croatian public companies for energy
distribution and supply. Also, herewe research the main goals of procurement
information system which must be achieved in every organization because
procurement process takes place in every public organization. Based on the
model of the business technology matrix their processes can be executed by
other companies engaged in similar activities. This research paper describes
the timing of the sub processes, also. The timing of sub processes needs to be
reduced as much as possible to achieve the planned results at the exit of the
sub processes so that the costs of running sub-processes are equal to or lower
than they had been so far, but with a higher quality output. We discuss
possible threats to the information systems organization, and how to protect
electronic information in the process of restoration of electronic data base
for the financial information system. At the end the research paper we explain
the advantages and disadvantages of cloud computing, information security in
the event of possible applications of computing in the clouds and activities
for technical information system in the flow diagram.
