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Journals / Ekonomi ve Finansal Araştırmalar Dergisi / 2026 / Cilt: 8 Sayı: 1

Time-Varying Causality Between Clean Energy and Green Technology: Evidence from the COVID-19

Temiz Enerji ve Yeşil Teknoloji Arasındaki Zamanla Değişen Nedensellik: COVID-19’dan Kanıtlar

Nesrin Akbulut(ALANYA ALAADDIN KEYKUBAT UNIVERSITY)0000-0002-1460-0950
Pages
73–88
Publication Date
2026-06-30
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

These results suggest that, in the post-pandemic period, clean energy plays a periodically triggering role for green technologies, while this effect varies over time and depending on conditions.

📌 3 Key Takeaways

🎯
Objective & Hypothesis:Despite the increasing emphasis on clean energy and green technology in the sustainability literature, empirical evidence on the time-varying causal relationship between these two domains remains limited, particularly in the post–COVID-19 period.
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Key Findings & Data:Therefore, the main objective of this study is to investigate the causal relationship between clean energy and green technology using daily data covering the period from 2 January 2020 to 2 October 2025, within the framework of the time-varying Granger causality approach developed by Shi et al. (2018, 2020) and by employing the recursive evolving window method.
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Conclusion & Impact:These results suggest that, in the post-pandemic period, clean energy plays a periodically triggering role for green technologies, while this effect varies over time and depending on conditions.
🔬Design:Araştırma Makalesi
📍Scope:2020 Verileri
⚙️Variables:Temiz Enerji · Yeşil Teknoloji · Zamanla Değişen Nedensellik

Abstract

Despite the increasing emphasis on clean energy and green technology in the sustainability literature, empirical evidence on the time-varying causal relationship between these two domains remains limited, particularly in the post–COVID-19 period. Therefore, the main objective of this study is to investigate the causal relationship between clean energy and green technology using daily data covering the period from 2 January 2020 to 2 October 2025, within the framework of the time-varying Granger causality approach developed by Shi et al. (2018, 2020) and by employing the recursive evolving window method. The findings show that causality from clean energy to green technology emerges at the 5% significance level only during certain subperiods, indicating that this relationship does not exhibit a stable and persistent structure throughout the entire sample. In contrast, no statistically significant time-varying causality is found from green technology to clean energy. These results suggest that, in the post-pandemic period, clean energy plays a periodically triggering role for green technologies, while this effect varies over time and depending on conditions.

Özet

Sürdürülebilirlik literatüründe temiz enerji ve yeşil teknoloji kavramlarına yönelik ilgi giderek artmasına rağmen, özellikle COVID-19 sonrası dönemde bu iki alan arasındaki zamanla değişen nedensel ilişkiye dair ampirik kanıtlar sınırlıdır. Bu çalışmanın amacı, 2 Ocak 2020–2 Ekim 2025 dönemine ait günlük verileri kullanarak, Shi vd. (2018, 2020) tarafından geliştirilen zamanla değişen Granger nedensellik yaklaşımı çerçevesinde tekrarlamalı gelişen pencereli yöntemi ile temiz enerji ve yeşil teknoloji arasındaki nedensellik ilişkisini incelemektir. Bulgular, temiz enerjiden yeşil teknolojiye doğru nedenselliğin %5 anlamlılık düzeyinde yalnızca belirli alt dönemlerde ortaya çıktığını ve bu ilişkinin tüm örneklem boyunca istikrarlı olmadığını göstermektedir. Buna karşılık, yeşil teknolojiden temiz enerjiye doğru anlamlı bir zamanla değişen nedensellik tespit edilmemiştir. Sonuçlar, pandemi sonrası dönemde temiz enerjinin yeşil teknolojiler açısından dönemsel olarak tetikleyici bir rol oynadığını, ancak bu etkinin zamana ve konjonktürel koşullara karşı duyarlı olduğunu ortaya koymaktadır. Bu doğrultuda çalışma, sürdürülebilir enerji dönüşümünde zamana duyarlı politika tasarımlarının önemine işaret etmektedir.

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Cite This Article

Akbulut, N. (2026). Time-Varying Causality Between Clean Energy and Green Technology: Evidence from the COVID-19. Ekonomi ve Finansal Araştırmalar Dergisi, Cilt: 8 Sayı: 1, 73–88. https://doi.org/10.56668/jefr.1863461

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