Batusa roof to supply electricity

Created: 08/13/2022, 16:31

By: Katrin Hager

Space for photovoltaics: The roof of the Batusa hall is to be used to generate electricity.

© Thomas Plettenberg

A PV system on the roof of the Batusa Hall in Holzkirchner is intended to help cover the energy needs of the community leisure facility itself.

Holzkirchen

– Russia's war against Ukraine has achieved what climate change only brought about with great difficulty: energy self-sufficiency is becoming a civic duty.

The market town of Holzkirchen could also give a little more gas to solar power.

The municipal council gave this to the administration as homework before the summer break.

Specifically, it was about the photovoltaic system that is to be built on the roof of the Batusa Hall on Baumgartenstrasse.

More than 100,000 kilowatt hours consumption

The Batusa Hall is used a lot.

That's good, but it also eats up a lot of energy: 100,741 kilowatt hours (kWh) of electricity were consumed there in 2019, the last year before Corona.

One problem: the energy-intensive fluorescent tubes that are still in use in many municipal buildings across the country.

The market town of Holzkirchen was advised by the IfE Institute for Energy Questions about the potential for saving energy.

The recommendation was clear: the lighting should be switched to more economical LEDs and the solar potential on the roof of the hall should be used.

The conversion to LED will take place during the summer holidays.

Photovoltaic (PV) is still in the planning stage.

Martin Eichner from the technical building authority of the market town explained the possibilities for a PV system on the roof of the Batusa hall.

The municipality has an offer for a 30 kilowatt peak (kWp) system from November 2021, which would probably be more expensive today.

The electricity costs for lighting and ventilation in the Batusa Hall – as of January – are around 18 cents per kWh.

A PV system would run CO2-neutral after three to four years, and would have paid for itself in around 15 years at current electricity costs.

How big does the system have to be?

The statics would not stand in the way of the project, a PV system with a sub-roof made of trapezoidal sheet metal would even be slightly lighter than the existing tile roofing.

The roof orientation in the southeast or southwest would also be suitable.

The question is how the system should be dimensioned.

"The current feed-in tariff for systems up to 40 kW is six cents per kilowatt hour," explained Eichner.

If the system exceeds this dimension, only four cents per kWh would flow as compensation.

The economic calculation was clear for the administration: they recommended a system with less than 40 kW.

"Please get the most out of it"

In the municipal council, this purely economic consideration of the matter did not make sense.

"We need the energy transition as soon as possible," said Simon Ammer (SPD), "every kilowatt hour counts." You have to get away from the small-scale systems, fully exploit the potential and use roof areas completely.

"Especially in our area, which is predestined for solar use." He appealed to consider the bill not only from a business point of view, but also from an economic point of view.

“You need every square meter of module area.” Felix Remuta (Greens) agreed with the ardent appeal.

"I ask you to get the maximum out of it." Martin Taubenberger (FWG) saw the market community as a role model.

"The feed-in tariff for excess current is shameful," said Taubenberger, "there should be an incentive." Josef Sappl senior.

(CSU) meanwhile stated that he was fundamentally in favor of PV use.

However, he asked for tax and similar effects on the neighboring underground combined heat and power plant of the municipal works to be clarified in advance.

"They deliver heat to the Batusa, that would be bad if we put that at risk."

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Mayor Christoph Schmid (CSU) took the homework list for the administration with him.

The council has not yet made a decision.

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