I can attest that. I installed panels on my house, they are not enough to cover my electrocity needs, let alone gas (heating). Even if it would be enough to cover electricity needs, the cost was (upfront) more than the equivalent of the next 20 years in bills.

To be fair, many of the costs are because of high demand (artificial, because the gov. mandates it to be installed) and lots of work to be integrated in the national grid. But as things are right now, it not economically convenient (at least where I live) and for what I have heard, in other places is not much different.