Smart grids may make power sector financially viable
November 23, 2009
Globally, smart grids are becoming more popular. Power distribution in India has also not been left untouched by this revolution in the grid system. If smart grids were to be the next big step for power distribution in India, it will make the sector financially more viable and control power theft, says an expert.
“Smart grids will make the sector more financially viable. This will help you get that much more money into the system. So with smart grids, power utilities will suffer lesser financial losses,” said Banmali Agrawala, executive director for strategy and business development, Tata Power Co Ltd.
A smart grid delivers electricity from suppliers to consumers using digital technology to control appliances at consumer homes to save energy, reduce cost, increase reliability and improve transparency. It includes all kinds of information technology—such as sensors, digital meters and a communications network. Among other things, a smart grid would be capable of avoiding outages, will save energy and help other green undertakings such as electric cars by encouraging use of renewable sources of energy.
With smart grids there is no need to send people to rectify things physically, in case of a power failure. A few commands from a computer at the control centre may help fix the problem or the equipment may even fix itself. Sensors on transmission lines and smart meters at customers' premises would locate the fault and smart switches then would be able to route power supply through other resources.
One of the important fundamentals in smart grids is ‘time of the day’ metering or time of usage, which involves dividing the time into different tariff slots where there would be higher rates for peak hours and lower rates for off-peak periods. With ‘time of the day’ metering, real time monitoring of the consumer’s actual consumption is possible. Mr Agrawala explains how consumption is already being monitored in some places in India. “In Delhi, we are already using it (monitoring actual power consumption) with New Delhi Power Ltd (NDPL); in Mumbai, we are using it in some areas and would like to increase it in other areas as well,” he said.
With ‘time of the day’ metering, problems like power theft could be easily tackled by both the consumer as well as the power supplier. ”Suppose if I see a family’s consumption going up all of a sudden, I should be able to call the consumer and enquire why the consumption has shot up suddenly. One can actually monitor consumption in a far more robust manner. With smart grids, you can have a far closer link with your consumer,” said Mr Agrawala.
A power import-export relation can also be established with the consumer through smart grids. Many electricity customers are installing their own electricity-generating equipment for reasons like economy, redundancy or environmental concerns. When a customer is generating more electricity than required for his own use, the surplus may be exported back to the power grid. This could prove helpful to distributors in meeting demand during peak hours.
In the exercise of distributing power, smart grids could make the system more efficient. “You can monitor the health of all the equipment that you have without actually having any people in place to keep a check,” Mr Agrawala added.
He also lists out other possible uses of the smart grid system. “We can look at the possibility of using the grid for other forms of communication,” said Mr Agrawala.
However, he points out what would be crucial in getting such a system in place, is ‘time of the day’ metering and lowering of current subsidies on energy.
“Without ‘time of the day’ metering, smart grids as a concept will not work. Secondly, the lower the subsidies on energy, the more effective will be these smart grids. The whole idea is that we want people to experience and experience the actual price of energy, before choosing a smart grid. The subsidy element has to go down,” added Mr Agrawala.
Smart grids—in the initial stages—would have a higher potential in urban areas, for power utilities. “To start with, the advantages in urban areas would be more because the potential in the urban areas to save is high and the subsidies in these areas are lesser. So if there is no subsidy, this concept of smart grids works well,” points out Mr Agrawala. — Amritha Pillay[email protected]