Aims: We study both the short term and long term effects of solar activity on the large transformers (150 kV and 400 kV) of the Greek national electric grid. Methods: We use data analysis and various statistical methods and models. Results: Contrary to common belief in PPC Greece. we see that there are considerable both short term (immediate) and long term effects of solar activity on... https://herbsdailyes.shop/product-category/thermometers-and-hygrometers/