What happens if you install net metering but state provided electricity is down?

To encourage use of solar energy the Govt is giving a good subsidy to the people who are installing solar energy electrical generators in their houses. There are two options and one is to charge batteries with solar energy and when the mains light goes use it like an inverter. That type of arrangement is useful where the main supply is unreliable and disruptive.

The second option is to connect the generated power to the state electricity grid. In big cities where the mains electrical grid is sturdy and there are no power breakdowns, the second option is better. Only problem is that if the mains goes you can not use the solar as a backup and then you must have the usual separate inverter for the purpose of backup light in the house.

When you connect your solar generation to the grid then the revenue corresponding to it is added to your account and is adjusted in your electric bill. So electric bill will be reduced or nullify to that extent. In case your revenue is more than your electric bill than in some states there is a provision of returning the balance revenue to the subscriber on yearly basis. So you can in fact earn from your solar installation.

If you have a solar power generator and if you are using it online by connecting it to the state power grid, if there is a power failure of the grid, you can't use the solar supply. You have to wait for the power to come.
The second option is to have batteries and charge them with solar power. Then you will not have any problem of power failures. You will have power as long as your batteries have the charge.
The best way is to connect the power generated by you to the grid line and use them. If you generate more than what you use the state government will pay you the money for the extra power you produced. You can have a separate inverter which will charge the batteries and you can use that when there a state power grid power failure.

Solar energy being generated at the basic individual unit is being popularised. As of now, Indian homes have two options.
Option one: A grid-connected circuit is cheaper, when there is excess energy it is given to the gird and when there is a shortage, it is taken from the gird.
Option two: The off-grid system that is expensive (due to the storage batteries) and though there is no money earned, it would be indirectly earned by the savings on the electricity bills.

So, which we choose would be based on our budget and the nature of power supply in the local region and the regulations of the particular state electricity board.

As far as I understand, you can use the solar energy directly but if you want to use it during night times when the power goes off, you cannot unless you have the batteries. So, in short, you cannot unless you have a HYBRID or MULTI-MODE type of solar energy system, This gives you the best of both conventional on gird and off grid systems. Hope this answers your query.

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