Saul Luciano Lliuya, 44, argues that electricity producer RWE -- one of the world's top emitters of carbon dioxide -- must share the cost of protecting his hometown, Huaraz, from a swollen glacier lake that is at risk of overflowing from melting snow and ice.

He wants the German company to pay 17,000 euros ($18,400) towards flood defences for his community, arguing that the fossil fuels the firm has used to generate electricity make it partly responsible for the flood risk.

"The reality is the glaciers are melting and sadly the mountains are suffering, and that has consequences," he told reporters outside a regional court in the west German city of Hamm.

"It's a risk for me. It's a risk for the more than 50,000 people who live in the danger zone."

Lliuya first filed a lawsuit in 2015 but a court in the western German city of Essen, where RWE is headquartered, dismissed it the following year.

In 2017, however, the Hamm court allowed an appeal.

After a delay due to the Covid pandemic, hearings are scheduled on Monday and Wednesday.

Roda Verheyen, Lliuya's lawyer in the case, expects proceedings to conclude at the end of next year.

- 'Experts recognise risk' -

Monday's hearing asked if Lliuya's property in Peru's Ancash region is at substantial risk of flooding, examining evidence collected by court-appointed experts who travelled to the area in 2022.

If judges confirm the risk, subsequent hearings would look at the question of RWE's responsibility.

Noah Walker-Crawford, a researcher advising Lliuya's legal team, said he was satisfied with the first day of proceedings.

"What's important to say is that the experts recognise that there is a risk," he said. "There is a possibility of a flood wave from the melting glaciers hitting the plaintiff's house."

A ruling on the issue of flood risk could come as soon as Wednesday, but more likely in the coming weeks.

Lliuya bases his legal claim on a 2014 study that concluded RWE was responsible for 0.47 percent of all global carbon emissions since the start of the industrial era.

RWE, which has never operated in Peru, should pay that share of the 3.5 million euros it would cost to lower the waters of Lake Palcacocha, he says.

- 'Fair contribution' -

Founded in 1898, RWE now uses a variety of power sources, including gas and coal as well as solar and wind.

Christoph Bals, head of policy at Germanwatch, an environmental campaign group supporting Lliuya in the case, said they came across his plight after being put in touch by a consultant advising Lliuya on how to manage the rising waters.

"They (the farmers in Huaraz) got talking and they said: 'It's not right. We have done nothing to contribute to climate change and now we're paying for it'," Bals said outside court.

RWE says a court ruling in favour of Lliuya would set a precedent of holding people responsible under German law for actions that have environmental consequences abroad.

"We think that is legally inadmissible and the wrong way to address this issue socially and politically," a spokesman said.

Dismissing the case in 2015, the Essen court said that it was impossible to draw a link between particular emissions and particular damage.

The Hamm hearing might be the first stage towards overturning that opinion, at a time when 43 climate-damage cases are ongoing worldwide, according to not-for-profit research group Zero Carbon Analytics.

Freshfields Bruckhaus Deringer, the law firm representing RWE, says that there could be major implications.

"The sum in dispute may be less than 20,000 euros. But the precedent-setting potential is clear," it said.

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