By bne Tehran bureau Iran is experiencing its hottest temperatures in 50 years, with the city of Ahvaz recording over 50 degrees Celsius (122 Fahrenheit) for more than seven days, according to Mostafa Rajabi Mashhadi, the managing director of Iran’s Power Generation and Transmission Company (Tavanir), Etemad reported on July 12. The extreme heat is expected to spread to Tehran and northern parts of the country, raising concerns about power supply stability as brownouts and blackouts continue to ravage the country over the summer period. ‘This is unprecedented in the last 50 years and is a very…