Its ALWAYS about money.
The fact is, solar dosent work in a triditional sense without the traditional power grid as defacto battery.
Your panels dont produce power 24/7. At night or on low sun days you need the traditional grid to keep power flowing as normal, and yet on good days you produce excess power and back feed that into the tradtional grid (at least in the usa). You get credit for that excess juice but the costs for maintaining the traditional power grid don't disappear for utility companies. Thats why rebates and credits for solar power are dropping. Its a natural leveling.
in the end you will still recop costs and eventual more than break even but the governments incentive to finance it up front is gone