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Renewable energies

Renewable energies - these are wind and solar energy, biomass, geothermal energy and hydropower. On the one hand, processes taking place in nature are used, and on the other, electricity, heat and fuels are generated from renewable raw materials. Renewable energies contribute to both climate protection and security of supply.

There are already a large number of plants for climate-friendly energy generation from renewable sources in the city of Jena. However, the potential is far from exhausted. In 2020, electrical energy generation from renewables covered just 6% of electrical energy consumption in the city of Jena (see Monitoring Report 2021 [PDF]).

In Jena, solar radiation energy is used directly by photovoltaic (PV) systems on the one hand and solar thermal systems on the other. In 2020, 94 PV systems with an installed capacity of 645 kWp were newly installed in the city of Jena. The total installed capacity of PV systems is 11,513 kWp.

Jena's first ground-mounted PV system was connected to the grid in August 2013. On the former Ilmnitz landfill site, 8360 polycrystalline modules with a peak output of approx. 2.14 MW were installed on a construction area of 32,990 m².

The map portal of the city of Jena offers the option of displaying the so-called solar cadastre in the "Photovoltaics" map layer. The solar cadastre determines the basic suitability of buildings in the city of Jena for the use of solar energy. In addition, information such as the size of the roof area, the roof pitch, the theoretically installable module output and the resulting electricity yield can be called up.

With the Thuringia solar calculator, on the other hand, you can check the solar suitability of almost any building or open space in the state. In addition to the profitability calculation, the solar calculator allows you to select financing options and search for suitable tradesmen to install the system. As a result, you will receive an overview with the annual yields, the amortization period, the CO2 savings, the self-consumption and self-sufficiency share as well as the profit after 20 years.

Two larger biogas and sewage gas plants are operated in Jena, both of which are located on the site of the Jena-Zwätzen central sewage treatment plant.

The biogas plant, operated by Biogas Jena GmbH & Co. KG, generated 10,590 MWh of electricity and 9,541 MWh of heat in 2020.

The sewage gas plant is operated by Zweckverband JenaWasser. Sewage gas is released during the fermentation of sewage sludge at the Jena-Zwätzen central sewage treatment plant and converted into electricity and heat in a combined heat and power plant. The electrical energy generated is in turn used to completely self-supply the sewage treatment plant. The "Energy self-sufficient sewage treatment plant Jena" project, funded by the Federal Ministry for the Environment, Nature Conservation, Building and Nuclear Safety, achieved energy self-sufficiency in November 2014. The energy self-sufficient wastewater treatment plant was awarded the Federal Ministry for the Environment's funding prize for "Energy-efficient wastewater treatment plants" and received funding of € 600,000.

The generation of electrical energy from hydropower is currently used at three larger run-of-river power plants in Jena. Based on estimates from previous years, these plants generate between 9,700 Mwh and 10,000 Mwh. It can be assumed that these differences are due to the different water flows in the Saale.

No significant expansion of hydropower is expected in the near future, as the maximum permissible damming and diversion sections of the watercourse have already been exhausted or exceeded.

Near-surface geothermal energy is used in the city of Jena. Preference is given to geothermal probes and geothermal collector systems, which use the stored energy in the subsurface.

If there is a sufficient supply of groundwater, groundwater heat pumps are also used, whereby the stored energy is extracted from the groundwater. If none of the three types of near-surface geothermal energy can be used due to the geological conditions, the air heat pump is another ecological alternative.

Location

Department of Urban Development and Environment

Am Anger 26
07743 Jena
Germany