Even in a small country like Belgium, solar can't even meet half of energy needs. In order for it to meet energy needs would require batteries, and that means doubling the cost for the public. If it were implemented in a large country like America, the cost would be astronomical, and that's without adding new transmission lines equivalent to every paved road in the U.S.
An analysis in Belgium found that households equipped with solar panels can get a maximum of about 40% of their required electricity - that is a hard ceiling. Using batteries to store available energy from sunny days would mean for an average household with an annual consumption of 3500kWh even getting to 70% of the electricity needs would cost another $20,000. Activists claim the free market will take over in battery development, ironically if it is subsidized enough first, but a reduction of battery prices will not be enough to make such installations profitable, given that they only represent a fraction of the total installation cost.
Power grids are dimensioned assuming that users have somewhat different use patterns, which end up balancing each other, resulting in a smoother load. That is why there are peak and off-peak hours. But solar can overload the grid given simultaneous production for a given region, and solar users incur no economic penalty for that currently, it is all benefit to them and no cost (costs are born by other users.)
New grid tariffs for home installations would make the system more fair, the authors of the new analysis contend, and better reflect the current cost structure of the power grid. This would result in large installations over smaller ones and lesson the households with a worse financial situation, which tend to consume less energy, but who are paying a higher average electricity price to subsidize solar.
The European Commission is already worried about this indirect subsidy from the typical consumer to those with solar panels.
Citation: Guilherme de Oliveira e Silva, Patrick Hendrick; "Photovoltaic self-sufficiency of Belgian households using lithium-ion batteries, and its impact on the grid"; Applied energy 195: 786-799 (2017) https://doi.org/10.1016/j.apenergy.2017.03.112
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