The existing lighting will be converted to energy-saving LED lighting. Where possible, the existing lights will be converted to LED, while completely new LED lights will be installed for the other lights. The hallway and stairwell lighting will be switched to motion detectors.

Contribution to climate and energy transition:
Reduction of electricity consumption by two-thirds and associated reduction in CO2 emissions for the generation of the electricity consumed.

Urban green spaces and trees bind CO2, improve air quality, and are important for urban design. Their transpiration cools the surrounding air, which is an important contribution to counteracting inner-city heat islands. In order to fully perform these important functions, green spaces and trees must be healthy and vital, which is a challenge in urban locations.

The aim of this project is therefore to improve the location of trees with the help of pneumatic soil aeration*, to remove compaction, to supply new nutrients, to promote root growth in new soil areas, and to improve water absorption capacity. In this way, valuable existing trees will be revitalized, their lifespan increased, and their resilience to future dry periods strengthened.

In addition, the project will help optimize the management of trees in urban areas, promote their adaptation to atypical locations, and strengthen their importance for the urban ecosystem and the environment.

*Pneumatic soil aeration is a method of improving soil aeration, especially in compacted or poorly permeable soils. Compressed air is introduced into the soil to loosen compacted soil particles and improve the air and water balance.

Contribution to climate change adaptation:
Trees play a crucial and extremely important role in climate change adaptation:

• Carbon sink ⇒ CO2 absorption
• Transpiration and natural shade ⇒ Cooling of the environment
• Absorption of air pollutants ⇒ Improvement of air quality
• Root systems regulate the water cycle & stabilize the soil
• Habitat and food for a variety of plant and animal species

Soil moisture sensors can be used to better control growth care and irrigation according to need and to achieve full establishment of young trees and new plantings, especially in inner-city areas. Such sensors measure the prevailing soil water tension (= the force with which the soil water is "held" in the existing pore system or which must be applied by the plant in order to "extract" water from the soil).

As the soil/substrate dries out, the soil water tension increases because the remaining water becomes increasingly bound in the pores. The data from the sensors is sent to a web platform via radio transmitters, allowing the current soil moisture status to be monitored at any time. Dynamic irrigation strategies for the trees are then determined on this basis. The sensors can thus be used as an early warning system in dry site conditions.

Contribution to climate change adaptation:

Trees play a crucial and extremely important role in adapting to climate change:

• Carbon sink ⇒ CO2 absorption from the atmosphere
• Transpiration and natural shade ⇒ Cooling of the environment, reduction of heat stress in urban areas
• Absorption of air pollutants ⇒ Improvement of air quality
• Root systems regulate the water cycle and protect against erosion by stabilizing the soil
• Habitat and food for a wide variety of plant and animal species

Seven diesel-powered fleet vehicles (built in 2013 and earlier) currently in the waste disposal company's fleet are being replaced by ten electric-powered fleet vehicles. The aim of the project is to continuously convert the fleet to alternative drive technologies (electromobility).

Contribution to climate and energy transition:

Significant reduction in greenhouse gas emissions.

Four diesel-powered waste collection vehicles (built in 2013 and earlier) currently in the waste disposal company's fleet will be replaced by six electric-powered waste collection vehicles. The vehicles are planned to be used for waste collection in the inner city area in order to contribute to reducing emissions and improving air quality, particularly in this highly polluted area. The aim is to continuously convert the waste disposal company's fleet to alternative drive technologies (electric mobility).

Contribution to climate and energy transition:
Significant reduction in greenhouse gas emissions.

The existing floodlight system will be converted to LED floodlights. The project includes dismantling and disposing of the old floodlights, installing the crossbeam, LED floodlights, and electronic ballast in the base of the floodlight mast, as well as lighting design for the required illumination of the playing field.

Contribution to climate and energy transition:
Reduction of electricity consumption and CO2 emissions.

The installation of a 3.5 MW/3.6 MWh battery storage system is intended to cover the Mainz sewage treatment plant's own energy requirements.

Contribution to climate protection and the energy transition:
The measure increases the plant's own consumption of self-generated electricity. Electricity procurement from the public grid is reduced. The energy storage system provides emergency power for the sewage treatment plant.

At the Mainz central sewage treatment plant and other Mainz municipal utility sites, 13 additional photovoltaic systems with a total output of approx. 920 kWp are being installed to increase in-house production. The 10 additional photovoltaic systems on the central sewage treatment plant site will make it possible to operate the planned fourth treatment stage predominantly with renewable energy.

Seven of the planned photovoltaic systems with a capacity of approximately 540 kWp are to be installed on existing roof areas of existing buildings and on the roof area of the newly planned fourth treatment stage, which will be built by 2026. A further three systems with a capacity of approximately 280 kWp will be installed on open spaces on the central sewage treatment plant site.

Contribution to climate and energy transition:
100% of the green photovoltaic electricity generated is used to supply the plant's own power needs. This makes it possible to operate an additional fourth treatment stage with self-generated renewable electricity.

Conversion of the current hall lighting in the old gym of the IGS Bretzenheim and the gym of the Pestalozzi School to energy-saving LED lighting.

The existing lighting is to be replaced with modern, energy-saving LED lighting. Where possible, some of the existing lights will be converted to LED, while completely new LED lights will be installed in other locations.

Contribution to climate protection and the energy transition:
Reduction of electricity consumption by two-thirds and associated reduction in CO emissions for the generation of the electricity consumed.

Construction of electricity storage facilities in conjunction with newly built photovoltaic systems for Mainz residents.

Contribution to climate protection and the energy transition:

As solar energy accounts for an increasing share of the German electricity mix, its emission factor is reduced. Especially in metropolitan areas, the expansion of solar energy is usually the key lever for decarbonizing the energy system. The promotion of storage facilities increases the self-consumption of solar power, thus making the construction and operation of solar energy more attractive for the electricity mix.

The program aims to promote the purchase of cargo bikes and electric cargo bikes in their basic configuration, together with a permanently installed transport structure, for private individuals whose primary residence is in Mainz.

Contribution to climate and energy transition:
The program promotes the switch from conventional, emission-intensive vehicles to emission-free or low-emission alternatives. Cargo bikes can replace emission-intensive vehicles, especially in inner-city areas and for short transport distances. Their use therefore has a direct impact on reducing greenhouse gases, air pollution, and energy consumption in urban traffic.