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This study unveils the causality between technology innovations and renewable energy in Germany. The discussion about technology innovations and renewable energy is beneficial because the country is most innovative and pursuing ambitious energy transition goals. The results of complete sample causality show that technology innovations significantly impact renewable energy. The rolling window method accounts for structural changes when examining the causal connection between technology innovations and renewable energy. The findings show that technology innovation drives renewable energy positively and negatively across multiple sub-samples. Similarly, renewable energy has a considerable effect on technology innovations in sub-samples, implying that advancement in renewable energy translates into increased spending on technology innovation. The future cornerstones of energy supply comprise fluctuating sources caused by weather which must be balanced out. • Examine the causality between technology innovations and renewable energy. • Explore that technology innovations have a significant impact on renewable energy. • Sub-samples causality is examined while considering structural changes. • Explore that technology innovation is driving renewable energy. • Renewable energy effect on technology innovations in sub-samples. [ABSTRACT FROM AUTHOR]