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Hamburg (dpa / lno) - In the opinion of Hamburg's Senator for the Environment Jens Kerstan (Greens), not only oil, but also natural gas heating systems must disappear to reduce CO2 pollution.

“We also need an exit strategy from natural gas.

That is clearly the case, ”he said on Monday when explaining the ordinance passed by the Senate at the end of 2020 on the requirement for solar roofs and the integration of renewable energies when replacing heating systems.

The proportion of gas in Germany must decrease “very significantly” by 2030.

Veit Bürger from the Freiburg Eco-Institute made a similar statement: Instead of heating oil and natural gas, heat pumps, biomass, solar thermal energy and district heating would have to be used.

According to the Climate Protection Act, photovoltaic systems must be installed on the roofs of new buildings by 2023 and at least 15 percent of the heat energy requirement must be met from renewables when the heating is replaced from the middle of this year.

All appeals did not result in roof areas being used on a large scale for solar energy, said Kerstan.

"That is why we went there to establish a duty there."

At the same time, however, the ordinance should ensure “that no one is exposed to an undue economic burden”.

Citizens from the Öko-Institut said that the 15 percent renewable thermal energy could be generated in whole or in part through replacement services.

He mentioned better insulation, new windows or solar collectors.

"Important: 18 months after commissioning the new heating system, it must be proven that the obligation has been fulfilled," said Bürger.

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Owners whose buildings cannot be converted for legal, technical or economic reasons are exempt from the obligation to use 15 percent renewable thermal energy.

In general, the use of renewable energies does not necessarily lead to higher costs.

Government subsidies and rising CO2 prices could even make it cheaper.

The obligation to install photovoltaic systems from 2023 ends with the technical possibilities, said Gerhard Stryi-Hipp from the Fraunhofer Institute for Solar Energy Systems.

The system must also be economically viable.

Stryi-Hipp assumed that in future around 1800 photovoltaic systems will be installed on new buildings in Hamburg, which corresponds to an output of around 5.4 megawatts.

© dpa-infocom, dpa: 210208-99-352710 / 2

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Information from Sentas on the climate plan and climate protection law