GENEVA — Swiss voters were expected to approve in a referendum Sunday a law aimed at accelerating the development of renewable energy as the country aims for carbon neutrality by 2050.

According to the final opinion polls published in May, 73 percent of voters are set to approve the law on "a secure electricity supply based on renewable energies."

Less than two months ago, Switzerland became the first country ever to be condemned by an international court for not doing enough to combat climate change in a ruling by the European Court of Human Rights.

The new law was approved by parliament last year, and most environmental organizations back the legislation and its ambitions.

However, a few smaller environmental groups that oppose it managed to garner enough support to trigger a referendum.

They fear it will fast-track large-scale energy projects and see Switzerland's pristine Alpine landscapes plastered in wind turbines and solar panels.

They also deplore limitations on the possibilities for local residents to launch appeals against the construction of new renewable energy installations.

Retired economist Pierre-Alain Bruchez, who spearheaded the referendum push, said there was "no reason to put solar panels on mountain pastures when there is so much space" on buildings.

He launched the battle after learning of the Grengiols-Solar project, aimed at installing around 230,000 solar panels in the mountainous Wallis canton at an altitude of 2,500 meters, calling it a "vision of horror."

Largest party opposes law

Switzerland's largest party, the hard-right Swiss People's Party (SVP), supports the referendum, above all in the name of defending civil nuclear power, which provided 32 percent of total energy production last year.

The SVP thinks renewable energy does not guarantee energy security due to its fluctuating nature.

The law is backed by major nongovernmental organizations such as Greenpeace and the World Wide Fund for Nature.

It aims to boost wind and solar power's current minuscule contribution to Switzerland's energy mix and rapidly increase hydropower production so that the wealthy landlocked country is less dependent on importing electricity.

The law envisions installing solar panels on building roofs and facades.

It also eases planning conditions for wind turbines and large solar installations.

The government acknowledges that court appeals against large energy projects "will probably be less likely to succeed than before."

But it stressed that projects would be examined on a case-by-case basis and constructing large installations in "biotopes of national importance" and migratory bird reservations will remain outlawed, albeit with some exceptions.

The law also outlines 16 hydroelectric projects, a sector that last year represented 57 percent of national electricity production. These involve building new dams or improving existing ones.

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