Technology foresight is mainly conducted by applying a combination of qualitative and quantitative methods. An evidence-based approach implies covering a wide range of information sources, as well as the active application of quantitative methods for processing. Therefore, it is very important to select the right sources of data, extract core information from them, and interpret the results correctly. In theoretical works devoted to identifying technology trends, the most widely used information sources are scientific publications and patents. There are also authors who propose relying on additional sources of data (media, conferences, business-related resources, and others). However, the issue of applicability and comparison of core and extra sources of information for monitoring technology trends has not received sufficient coverage in the literature. In connection with this, the purpose of this paper is to conduct a comparative analysis of the results of technology monitoring by using various information sources (scientific publications, patents, media, foresight-projects, conferences, international projects, dissertations, and presentations). The proposed approach is tested on the area of green energy and the results are described and analyzed. Possible factors that can affect the results of data processing are considered and discussed in order to more efficiently use the comparative analysis of quantitative and qualitative procedures for identifying, correcting, and updating global technology trends on a regular basis. JEL Classification: O31, O32, O33, O38.