Electricity is a major need in the industrial era 4.0, where almost all human activities use electricity both at home and in companies. The state electricity company can meet not all electricity needs. Therefore, alternative energy sources are needed to be used as power plants to meet the huge demand for electricity by paying attention to safety. Because it is located in the tropics, the potential for solar energy in Indonesia is very large, in the range of 4.8 KWh/m2 equivalent to 112,000 GWp, which can be used as an alternative energy source for electricity generation using solar panels. Meanwhile, the security system for solar power plants can utilize internet of things technology to be monitored anytime and anywhere by accessing a website that has been created using the Codeigniter framework. The tools used as a monitoring system include Arduino Uno R3, nodeMCU ESP8266, voltage sensors, acs712 sensors, and so on. While the software used is Arduino IDE which has been installed on a computer or laptop and uses a web browser. The method used in this study is the prototyping method. A prototype tool with a limited capacity is created, determining which tools are required. The process is then repeated to create a security monitoring system in tools and websites.