There are two major hurdles with Building Integrated Photovoltaic (BIPV).
First and foremost, there is cost. Unless the builder of the building in question is governmental or institutional, or a major business that isn't going anywhere for a long time, the cost of including photovoltaics cannot be recouped fast enough to make the economic decision an appropriate one. A developer, for instance, building a multi-unit condominium or mixed use building, is highly unlikely to utilize BIPV because he's looking for an immediate profit on the building by selling it off, and does not care about long-term savings on electrical bills.
Furthermore, as to the long-term gain, Photovoltaics at this point have a useful lifespan of approximately 30 years, at which point they no longer function, and have to be replaced. Depending on correct exposure to the sun, and local ordinances regarding incentives like grants and tax breaks, it is possible to gain a pay-back on your BIPV in as little as ten years, however, it is more likely that the pay-back will not be realized for more like 15-20 years. This leaves only 10-15 years for your system to generate a "profit" which is then necessarily much more of a fund toward replacing itself.
The difficulty contributing to the problem of payback is that solar panels generate electricity only when exposed to sunlight. Storage of the generated electricity is supremely costly and prohibitively inefficient at this point. There is just not a good, safe, economical way to store large amounts of electricity, literally to be distributed for a rainy day.
This is somewhat averted in some municipalities by being able to sell your extra electricity back to the grid when you are overproducing, which will allow you credits toward the times you are drawing power, however the overall life cycle costs of the application are typically break-even at the very best.
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