Finance of renewable energy in a sustainable world, Faruk Dayı, Editör, NOVA Science Publishers Inc. , London, ss.197-209, 2025
In the 21st century, where the harms of traditional energy usage to humans and nature have
become more apparent, and countries are striving to produce solutions for the global risk
that has emerged, it is observed that investments in renewable energy sources have been
supported to minimize these damages. It is observed that companies operating in Turkey
are increasing their investments gradually to take their place in the renewable energy
market and are starting to form their technological infrastructure based on alternative
energy sources.Within the scope of this study, the factors affecting the market performance
of 22 companies focused on renewable energy and listed in Borsa Istanbul (BIST) were
examined. For this purpose, a time series analysis was conducted to determine the impact
of the VIX, BIST100, CDS, interest rate, exchange rate, gold price, Brent oil price, and gas
price on the Renewable Energy Sector (YES) index between 01.03.2020 and 21.02.2024.
After the unit root test, a Gregory-Hansen cointegration test was conducted for the data
that was determined to have structural breaks, and the presence of cointegration between
the YES and the explanatory variables was identified. To determine the long-term and
short-term asymmetric cointegration effects of the explanatory variables on the YES
variable, a Nonlinear Autoregressive Distributed Lag Model (NARDL) analysis was
performed. According to the analysis findings, while an asymmetric relationship was
detected between the YES variable and the CDSTURKEY, KUR, BRENT, and GAS
variables in the long term, an asymmetric relationship was also determined between the
YES variable and the ONS and GAS variables in the short term. As a result of the Granger
causality analysis conducted to determine the existence of a causality relationship between
the variables, a one-way causality relationship was identified from YES to CDSTURKEY
and DIBS and from VIX, XU100, and BRENT to YES.