It does also reduce CO2 emissions, although the manufacture of the panels has to be offset in calculating that.
As one of the first people in Australia to install panels on my house, I can say the cost savings with the feed-in tariff I had were substantial.
My quarterly power bill went from $300 to a couple of dollars, the capital cost was recovered in two and a half years.
Capital recovery now is probably not as good, due to power companies reducing the feed-in tariff.
It was a purely commercial decision, virtue signalling was not on my mind.
The next evolution, happening now, is powerwall batteries that can store solar energy, making a household completely independent of the grid.
That really has companies who gold-plated their assets very worried. They can only hike prices so far.