in the last 5 years themar has invested in sustainable energy production systems. a small local heat network was installed with a cogeneration unit of 15 kw electric and 30 kw thermal energy. also photovoltaics (6 kwp) and a heat pump (20 kw) which is using the water and thermal energy from the river werra have been established. these renovations were completed in march 2019. in total themar is saving carbon dioxide emissions of 14,200 kg per year.