This paper provides a new technique of multi-sensor data fusion to achieve an optimal spatial design and power operation of integrated Renewable Energy Grids (REG). This new approach depends on making a sensor data fusion system depending on the spatial concepts for measuring the important climate parameters, which have a great effect on the performance of REG. This methodology has been designed around spatial concept to reach the optimal operation continuously. The spatial concept has a successful relationship with power energy smart grids. Wireless reliable sensorsbased network configuration has been developed around the power stations locations to provide online-required operational climate data to supply the algorithm with necessitated measured data. The realistic procedure of the wireless reliable climate sensors networks in terms of the locations, number and types of sensors and the method of dealing with are analyzed. To test the feasibility of sensors data fusion system, a practical case study in Egypt is applied. Moreover, a missing sensor data case is discussed and its results have been included.