It costs the state nothing to remove regulations preventing the installations and people who buy one see ROI of 15-20%. It also helps the grid by moving production closer to consumption.
> It also helps the grid by moving production closer to consumption.
On the side of the grid, balcony solar means grid maintenance is supported by less revenue (your utility bill pays for the grid, balcony solar expenses don't).
On the side of the producer, it means manageable production means are only amortized when balcony solar isn't producing (this isn't a small factor in a grid where electricity costs frequently reach zero). That increases the cost of electricity when the sun doesn't shine. Another aspect of this is that
These factors mean that balcony solar would be unprofitable if power was metered depending on real whole-system costs (e.g. market prices and/or a subscription for the grid). That it is profitable for some actors now just means that the cost system isn't aligned with the billing system. This isn't bad per se (people prefer to have predictable, stable energy costs), but can't be sustained in a system where this imbalance can be arbitraged.
