Tamil Nadu’s Solar Energy Policy can go a long way in addressing the supply-demand mismatch The State’s solar initiative can draw on the strengths of its robust wind power programme
Is the sun the answer to Tamil Nadu’s power crisis? With the unveiling of the Solar Energy Policy last week, Tamil Nadu joins the long list of States trying to find a way of harnessing this source of renewable energy for mass utilisation.
The gap is more than what a recharged policy can help fill. Until recently, most parts of the State had over 14 hours of load shedding. However, as an indication of the State government’s resolve to address the demand-supply mismatch, the new policy has aroused enough interest among domestic and industrial consumers.
This is the first time in recent years that the State government has prepared a policy specifically concerning one form of renewable energy. All along, the policy framework on the renewable energy sector was generally based on directions of the Tamil Nadu Electricity Regulatory Commission with the government playing a limited role. Needless to say, the document draws some strength from the Jawaharlal Nehru National Solar Energy Mission.
By setting the ambitious target of 3,000 megawatt (MW) solar power generation by 2015, the Tamil Nadu policy makes itself distinct in certain respects from policies of other States such as Gujarat and Rajasthan, the leaders in tapping solar energy.
First off, the incentive. Domestic consumers, who opt for rooftop solar power installations, will be eligible to receive generation-based incentive (GBI), a move that is bound to instill greater public interest. Even the Rajasthan Solar Energy Policy of April 2011 refers to GBI but is applicable only to distribution companies of the State.
Next, the order. Sections of high-end consumers including special economic zones and information technology parks have been directed to purchase a quantum of power from solar sources.
Initially, these power consumers have to procure three per cent of their consumption and this will remain in force till December 2013, after which the quantum goes up to six per cent.
The prescriptions are much higher in Tamil Nadu than in Gujarat, which has been marketing itself as a trendsetter in the field. As per the Gujarat Electricity Regulatory Commission’s order of January 2012 on tariff determination for solar energy procurement, the prescribed quantum for the current year is 0.5 per cent.
Unlike in the case of the Andhra Pradesh Solar Power Policy [announced in September] that clearly lays the responsibility on private developers of solar power plant projects to acquire land, the Policy of Tamil Nadu talks of land allotment in industrial estates at a reasonable cost.
Notwithstanding these impressive features, the policy has evoked some doubts as to whether it can become a hit among domestic consumers, crucial for the policy to succeed.
A section of solar products manufacturers is of the view that the incentive is not attractive enough for domestic consumers if the five-per-cent Value Added Tax were to be factored in to the cost of a one-kilowatt (kW) solar photovoltaic plant. According to an estimate, the tax amount would be around Rs. 12,500 whereas the amount of incentive allowed for six years under the GBI scheme would come to Rs. 10,500. Manufacturers are asking the government not to levy VAT on these solar sets. The AP Solar Energy Policy has already set an example by providing for VAT refund on inputs for all solar power projects.
K.E. Raghunathan, a long-standing manufacturer, says the government would do well to arrange loans at concessional rate of interest, apart from providing a liberal subsidy on the cost of the sets. The present scheme, administered by the Union government, is not adequate as it envisages subsidy of Rs. 81 per watt or 30 per cent, whichever is lower.
Amazingly, wind power, another source of renewable energy, has grown in leaps and bounds in Tamil Nadu without the authorities having to undertake high-profile and aggressive marketing. More than 25 years since the launch of the nationwide programme to tap wind energy, Tamil Nadu still remains the leader, accounting for about 40 per cent [6,970 MW] of the country’s installed capacity of wind mills. It is a tribute to the inherent strengths of the State and the administration as well as the silent and constructive work culture of the people of the State. At a time when big plans are drawn up to promote solar power, these qualities may stand in good stead again.
(With inputs from M. Soundariya Preetha in Coimbatore.)
Keywords: solar energy, KSEB, power crisis, power consumption, people-friendly tariff revision strategy, TNEB, generation-based incentive, rooftop solar power installations





To Mr Periasamy Solar power works out cheaper than running polluting gensets on diesel. The high investment costs will be borne by individuals rather then government. It can be compared to owning a two wheelers which requires investment but gives commuting choices to owners where public transport is not good.
I have already started collecting brochures of solar energy
specialization companies and will soon install them in my house. I
want Hindu to do an investigation on whether thermal batteries are
economically viable in the place of lead acid batteries. Thermal
battery has been successfully used in Solar Taxi which a Mr. Louis
Palmer made and traveled all over the world. I have learnt that they
can be manufactured with common salt, they store more electricity than
lead acid batteries, and are eco-friendly. If such a battery can be
used to power a car for 400 km they surely in combination with solar
energy can be used to free the Indian home totally from the grid. They
can run washing machines, fridge heavy appliances. Can any solar
energy specialist show some light on this subject? I kindly request
The Hindu to help out.
Please look at the following facts :
1) The PLF of Solar plants can not be more than 20%. That means, this
3000 MW solar is just equivalent to 750 MW of Coal / Nuclear plant (3000 x 20/80). But we are going to spend close to Rs.25000 crores for this 750 MW !
2) Solar will be available only during day time. In another one year, after the commissioning of about 3000 MW of ongoing Coal / Nuclear projects, we will not have any shortage in day time. We may have peak time shortage only, unfortunately when Solar power will not be available. Hence this Solar investment will become redundant after one or two years unless we are planning for atleast about 2000 MW Battery storage ! Our Pumped Storage Hydel power options are limited.
3) To use the Solar power effectively, Coal / Nuclear plants will be proportionately asked to back down, like it is being done for utilising the Wind Mills as and when they are available.
Will this not affect the financial performance of Coal / Nuclear plants ? 4) The life of the Batteries is hardly 5-6 years. The replacement cost and the disposal of batteries are going to be big challenges.
5) In TN, we have a combination of dust and humid climate. With this combination, there is need for frequent cleaning of PV Cells. This adds to operating cost and also decreases the life of PV cells. The problem is acute for Thin Film based solar PV plants. In countries like Germany it is some what better due to frequent rain and clean air, though the PLF there is much lower.
6) Regarding the cost of solar power, the story is awful. If we take a very optimistic figure of just Rs.1,00,000 per KW of installed capacity for a typical roof top plant, the interest alone works out Rs.12,000 per year. The value of electricity produced is going to be just Rs.9,000 (5x300x6).
What about the Battery replacement cost, depreciation of the original plant investment, cleaning cost, etc ? Does it make any economic sense ?
It is unfortunate that thinking that we are " progressive" and also by falling prey to popular sentiments, TN Government is yet again doing a mistake on the power front.
About 10 years back, it started encouraging Wind Mills in a big way. About Rs.50,000 crores has been invested to install about 6300 MW of Wind mills. From these Wind Mills, we are hardly getting about 3000 MW maximum for just few months in a year. The PLF is hardly 14 % as against 70-80% for Coal / Nuclear plants.
If only we had invested this Rs.50,000 crores in Coal / Nuclear plants we could have installed 7000 MW and we would be getting atleast 6000 MW for all 365 days in a year and for all 24 hours a day. Now we will not be having any power cut at all ! But today, every one is unhappy.
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