Germany has recently announced that it intends to move its energy production to 100% renewable sources by 2035 (as reported e.g. by Reuters). This seems to include phasing out both power plants reliant on fossil fuels (coal, oil, natural gas) and nuclear reactors. According to my understanding, most of the renewable sources of energy are somewhat unstable and require being backed up either by conventional power plants or by energy storage with sufficient capacity. Since the technology for large-scale grid energy storage is still in relative infancy, it would seem that Germany's plan may be challenging or even impossible to implement in practice. I was wondering if any of the German politicians laid out concrete steps to achieve the proclaimed goal or at least explained why the government considers it realistic.
tl;dr: Germany doesn't plan to reach 100% renewable energy sources -- a February draft called for a 100% renewable electricity sector by 2035, but as of April even this goal is unclear.
The Reuters article in the question, "Germany aims to get 100% of energy from renewable sources by 2035" is dated February 28, 2022 and was based on "a government draft paper obtained by Reuters on Monday." In contrast to the headline, the article indicated that only the electricity sector was included in the 100% target.
The article goes on to say that
the corresponding amendment to the country's Renewable Energy Sources Act (EEG) is ready and the share of wind or solar power should reach 80% by 2030.
A more recent article discussing the EEG act confirms this 80% by 2030 target. From an April 6, 2022 article "Germany unveils plans to accelerate green energy expansion":
Germany's economy and climate ministry presented a package of measures on Wednesday to speed up the expansion of renewable energy [...]
The package envisages green energy accounting for 80% of the power mix in Europe's biggest economy by 2030, up from about 40% now and a previous target of 65%.
No mention is made of a 100% renewable target in this more recent coverage.
As the legislation isn't finalized yet it's unclear how Germany plans to accomplish either goal, but it looks like a combination of offshore wind and energy efficiency are expected to be key components (emphasis added):
The country's Renewable Energy Sources Act (EEG) also includes a goal for offshore wind energy to reach at least 30 GW by 2030 - equivalent to the capacity of 10 nuclear plants - and at least 70 GW by 2045, the sources added.
Further legislative changes are expected during the year, in particular regarding energy efficiency in buildings and the reduction of greenhouse gas emissions in the transport sector.
Seems rather extremely unlikely this can happen. Considering with nuclear, Germany is roughly 3000terawatts hours away from achieving 100%.
For solar at current best case 210Wm^2, using 50% of the published 1631 solar hours in 2021, 17.5 billion square meters of solar panels beyond the current. Or a space 132 kilometers square.
Not sure of the reasons for going renewable, but if climate were the concerns, there's going to be an excess in absorption in thermal energy by these panels to the tune of 7terawatts above normal land below the panels which then will become part of the ecosphere.
Now all this is at lossless transfer, but the primary point is that at peak use , winter , solar and wind are at minimum output. So then comes storage. You would need roughly half of the yearly energy budget stored. So a 1500terawatt hour battery. Not going to bother, it would be the modt ecologically disastrous potential on the planet.
In other words, this mandate is not going to happen, or its a death wish by , well someone, for the German people.