Bringing electricity and power to the rural or no accessibility to grid connection has always been a major challenge in developing countries, such as Iraq. Many remote areas in Iraq have randomly expanded in the past few years with the same generating stations and old network and the possibility of delivering electricity requires much time and money.<br />Currently, the selection of rural areas is an ideal opportunity for the sustainable development of remote areas in developing and developed countries. Therefore, renewable energy and related technologies are being actively developed and applied throughout the world to bring safety to humans and improve their lives. <br />In recent years, various renewable energy systems, including wind, solar, geothermal, tidal, wave, and biofuel hybrid power systems, have been deployed on a medium to large scale in various countries. <br />An urgent need for renewable energy systems is evident; although many systems have been designed and implemented, a definitive system of renewable energy that is acceptable and viable worldwide is lacking. The current renewable energy systems in use range from small to large scale projects including grid-connected, isolated, and hybrid systems. Hybrid systems are proven to be highly reliable and have more cost-effective operation than systems using only one source of energy. <br />Several previous studies have identified the fundamentals of hybrid power system design and have introduced hybrid systems as an ideal solution for independent power supply in remote areas. The technical and economic characteristics of hybrid energy systems have been comprehensively investigated, and outlines of the expected future directions in developing hybrids have been provided. <br />Appropriate guidelines have also been presented to evaluate long-term hybrid energy systems with different configurations. Proposals have been made to explore the short-term performance components of the systems required in the actual phase of development to serve as demonstration projects. In this way, the activity can be monitored for long-term assessment. The characteristics of the components can also be analysed to understand hybrid systems completely. For many years, several renewable energy sources such as solar energy, wind energy and others have been applied for electricity generation in many remote areas in the world. <br />Iraq is a large country with numerous villages and cities in remote areas. Rural areas are typically a great distance from the national grid and their locations are usually in challenging terrain like hilly areas or dense forests, to which the extension of transmission lines can be very expensive or impracticable. Therefore, the feasibility of grid extension lines is low due to the high cost factor. <br />The sources of renewable energy are plentiful, free, clean, easily available, and environmentally friendly. Under such circumstances, stand-alone renewable energy-based power-generating options appear to be the ideal alternative. Such an alternative can comprise hybrid power systems, such as (solar energy with diesel generator) or (wind energy with diesel generator) or (solar – wind energy with diesel generator), with or without a battery backup option. <br />Based on the comprehensive literature reviews in the field of different combination of hybrid renewable energy system (HRES) using several techniques following wide findings can be given. The hybrid renewable energy system (HRES) found to be a superior alternative with the aim of incorporate substitute for electricity production. Ongoing research and development have determined that an appropriately optimized hybrid system is cost effective and offers higher reliability than single-power-source systems. The hybrid renewable energy system with backup energy unit such as battery banks (BB), and diesel generator (DG) can help decrease the energy costs, emissions and improve reliability of the system.<br />