Two Belgian nuclear reactors which were supposed to retire this year at age 40, will remain operational until they are half a century old.

Federal energy minister Marie Christine Marghem said the longer lifespan, until 2025, was necessary to ensure security of electricity supply in Belgium.

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The Belgian government announced that negotiations with energy company Electrabel on the life extension of reactors Doel 1 and 2 have been concluded on Wednesday (29 July).

However, critics say that the unexpected U-turn from a previous government's commitment to close the reactors is putting off investors.

The sense of urgency that Belgium needed to up its energy security was partly strengthened by failures in other nuclear reactors.

About half of Belgium's electricity supply comes from its seven nuclear reactors. Three of them were offline for months on end in 2014, another two suffered from temporary shutdowns.

Reactors Doel 3 and Tihange 2, which each supply around 1,000 megawatt – around 13 percent of Belgium's electricity – have been unavailable for more than a year now, because of a repair of “microcracks” in the pressure vessels. They are scheduled to restart 1 November 2015

The temporary loss of part of the nuclear power, combined with a possibility of a harsh winter, caused concern last autumn that Belgium could be faced with blackouts.

Board games to save electricity

The Belgian government called on citizens to reduce electricity consumption, play board games instead of computer games and cook meals in one pan instead of several.

It also set up plans to pre-emptively disconnect selected areas when a local power shortage was expected to jeopardise the whole grid.

“In the end, nothing bad happened, because it wasn't a cold winter,” energy researcher Fabio Genoese told this website. But the government did not exaggerate the potential problems, he added.

“It was a critical situation, for sure”, said Genoese, a research fellow at the Centre for European Policy Studies in Brussels.

However, he said that for the coming winter, it is “statistically unlikely” that there will be another combination of reactors offline for maintenance and cold temperatures.

According to Belgian media, minister Marghem last month said that there would be no need to worry for electricity shortages this winter.

The decision to extend the lifetime of Doel 1 and 2 is set to create a surplus capacity.

And because in 2003 the Belgian government decided to phase out nuclear power plants, starting with the retirement of Doel 1 and 2 (433 megawatt each) this year, investors in gas supplies had expected there would be demand for their product.

Not good for investors

“This is a typical example of an unexpected policy intervention which is not good for the investment framework,” noted Genoese.

In December, he told EUobserver that the "problem of Belgian politics" was to blame for the blackout scare, with its multiple layers of government and the limited shelf life of the average Belgian coalitions.

“You had so many energy ministers, from different political parties, [each] putting their political view in energy policy. … People do not trust the framework enough to do investments,” he said then.

Now, the researcher said the government decision to continue with Doel 1 and 2 will decrease investors' trust even more. "You cannot rely on this", he said.

His analysis is similar to what energy commissioner Maros Sefovic is expected to say in October, when he will speak to Belgian representatives on his 'Energy Union tour'.

According to a draft paper of the Commission's analysis of the Belgian energy system, leaked two months ago, the EU's executive said one of the country's weaknesses is: “Insufficient regulatory and planning stability delays investments in electricity production and infrastructure".