Net-metering can potentially drive widespread implementation of distributed generation by incentivising end-users to adopt localized power generation through technologies such as solar. In theory, net-metering is the proverbial silver bullet designed to help India achieve greater energy security through generation at point of consumption (distributed generation). In addition to helping consumers reduce their energy bills, it is also supposed to help stabilise the national, regional and state grids, provide financial relief to the distribution companies (DISCOMs) through consumer default risk mitigation and reduction of AT&C losses, and help cut down the per-capita energy footprint. Unfortunately solar adoption through net-metering has not picked up, even in 12 states and union-territories where it has been implemented. Both DISCOMs and end-consumers are reluctant to adopt net-metering. This article is post 1 of 2 on this matter and discusses the consumer side of the issue.
Net-metering is crucial for India if it wants to achieve energy security by 2022
Improvement in inverter technology and innovation in financial incentives is required for large scale adoption of net-metering
While technological improvements will enable market growth, financial innovations will drive the growth
There are two main reasons for the disappointing adoption of net-metering by the consumers: the tariff structure (a policy matter) and grid-reliability (a technical concern). Both issues are relevant for the residential, commercial and industrial segments. In this post, I have focused on the residential segments since it exemplifies the issues well.
Reason 1: Tariff structure (a policy issue)
Net-metering allows customers who generate their own electricity from solar to feed unused electricity back into the grid and be compensated for that. If the energy supplied by the consumer to the grid (selling) is at a special, usually higher, tariff rate than the one at which electricity is bought from the grid (buying), then it is called a feed-in-tariff. However, if the selling and buying are at the same tariff-rate (usually the buying rate), then it is called net-metering. And herein lies a problem.
Residential (and agricultural) tariffs are purposefully and artificially kept low (through subsidy) to influence the voters (e.g. Delhi elections). The actual average tariff rate varies widely in each state ranging from approximately Rs. 2.8/unit in Chhattisgarh to Rs. 6.15/unit in Maharashtra for MSEDCL consumers. In the highest consumption slab, they can even reach Rs. 11/unit in certain states. Residential rooftop solar PV systems today, on the other hand, produce electricity at a fairly constant cost across the country of approximately Rs. 10/unit reducing yearly as system prices drop.
Thus a net-metering customer in Chhattisgarh will have to sell electricity at a loss of almost Rs 7/unit. Only residential customers in the highest consumption of some states benefit as they can sell at a profit and recover their investment within a few years.
DISCOMs recover the revenue lost due to subsidy for residential and agricultural users by levying extra charges on the commercial and industrial segments. If one removes this cross subsidy then the tariff rates will become more realistic and net-metering for all users will make more financial sense.
However, since there is no sign of change in vote gathering mechanisms and thus removal of cross subsidy in the near future, feed-in-tariff comes across as a possible solution. Unfortunately, feed-in-tariff is just not possible in India is because of the simple reason that the DISCOMs are in financial deficit they have no money to pay the users. Lack of viable financial incentives is, thus, restricting end customers adoption of net-metering.
For net-metering to make financial sense, the solar industry, its financiers and the Indian government will have to introduce innovative financial incentives (may be such as tax-credits) to make choosing solar through net-metering easier for consumers.
Reason 2: Grid reliability (a technical issue)
One of the key requirements for any energy source to connect to the grid is the availability of anti-islanding protection. Anti-islanding protection is a way for the inverter to shut itself off and stop feeding power into the grid, when it senses a problem with the power grid, such as a power outage. This requirement is crucial because when problems arise with the power grid, it is assumed that workers will be sent to deal with it, and the power lines need to be completely safe i.e. not have electricity flowing from all the nearby PV grid-tie systems so that the workers can fix them without putting their lives in danger.
Most of the states in India, unfortunately, suffer from frequent power outages, mostly due to load shedding rather than problems in the grids infrastructure. Thus when the grid shuts off, the solar PV inverter will also turn off completely, preventing the owner from using the generated energy for themselves. With high unreliability of the grid, a lot of the electricity generated by the solar PV system will be wasted. This is a key reason for consumers to adopt solar with net-metering.
The anti-islanding protection is an essential safety feature that cannot be removed. Thus, the solution is technological innovation. Inverter manufacturers will have to make their inverters capable of cutting off the connection to the grid in case of grid failure, while still being able to operate (acquire reference voltage) and provide solar energy for use. If such a provision is available then net-metering customers can still use their grid-connected PV systems even during power outages.
In essence, consumers are seeking better incentives and a resolution of technical obstacles before they invest in residential solar PV systems. Policy makers, meanwhile, are coming up with multiple mechanisms to incentivize net-metering adoption from both sides to help DISCOMs improve their financial health and to enable a reliable energy supply. Unfortunately, this is just one side of the story. DISCOMs are wary of net-metering for various reasons. Policy makers are working hard to convince them to accept it as a viable solution. This convoluted state of affairs is, unfortunately, working against net-metering and Indias progress to achieve energy security. In the next post I will cover why DISCOMs view net-metering unfavourably. In the meantime, I hope that the solar industry will find solutions to the issues covered in this post.
Source: Bridge to India
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14 June 2017