Alternate Energy Pathways

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AVAILABLE ALTERNATE ENERGY PATHWAYS

FOR INDIABy Ashok Kundapur

15 Jan 2010

As fossil fuels are fast getting depleted, efforts are on to find alternative and

cleaner methods of energy production. Nature has abundant sources of energy but

unfortunately, the technology to utilize these greener alternatives is still not fully

developed.

Energy has become the key requirement for development but at the same time over consumptionof energy poses grave threat to the precious ecosystem. Today, most of energy is produced from

fossil fuels. But do we have enough coal to last even 50 years? Then what about emission of

CO2, and related green house gases and their effects? Without giving serious thought to theseissues, planners world over are sanctioning more coal-based power plants.

According to Indian Government estimates we are already producing about 1,35,000 MW power,

majority of which is through coal-based plants. In India, present generating efficiencies are

between 50 and 60%, while in other developed nations, it is nearly 85%. Simply put, merelyenhancing efficiency can yield nearly 33,000 MW of more power. And if we can minimize our

high Transmission and Distribution losses, we can save another 40,000 MW. The government

plans to generate 45,000 MW in the next two years and assuming that this increase is without

addressing the efficiency issue and T&D losses, we will be losing 65,000 MW! With such trends,production of more energy will only mean more loss, and this is a loss to the public exchequer,

and so it concerns everyone.

Nevertheless, we now need to look beyond reducing losses and maximizing efficiency and thinkbeyond the fast depleting fossil fuels. Practically every river is dammed, thus exhausting the

hydroelectric option as well. The coal burning power plants are already facing acute fuel crunch

of various sorts and magnitudes and plant load capacities are also depressed.

Oblivious to this fact, our planners are 'dedicating' 4000 MW coal-based super Thermal PowerPlants (TPPs) to every state. And this despite the various reports of coal-based plants posing

health hazards to the locals. In USA alone, deaths associated with such power plant pollution are

estimated to be about 150,000 per year. Literature abounds with data establishing that crop yield

too is drastically affected by the pollution.

With reference to coastal power plants, it is a well documented fact that fish catch is reduced

near TPPs. One estimate indicates that around Tuticorin, fishermen lose nearly Rs 65 crore worth

of fish catch annually.

Fortunately for us all is still not lost. The world can turn to renewable sources and be rolling inenergy which is both pollution-free and sustainable.
http://www.d-sector.org/authorall.asp?authorId=150http://www.d-sector.org/authorall.asp?authorId=150


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Table 1: Renewable Energy potential in India

Potential (Grid interactive power only)

Wind energy 45,000 MWSmall hydro 15,000 MW

Solar Over 5,000 trillion kWH/year potential(estimated to be more than the total energy

needs of the country)

Biomass 17,000 MW

Ocean Wave With about 7,000 km of coastal line it is alsohuge, estimated at 40,000 MW

Wind Energy

Off Shore wind farm at Blvandhuk, Denmark.

It has 80 wind turbines and a total capacity of 160 MW

Wind Energy has made its presence felt in our country and even some of the bigwigs aregenerating enough wind power to run their units. According to Indian Wind Energy Association

our installed wind power capacity is around 9587 MW, fourth largest in the world. While in


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many foreign countries, off shore wind farms are being established. However, it could be a

problem if Governments do not lift wind power during monsoon, as has happened in TamilNadu. The government would need to ensure that there are adequate planning and grid

interactions, if Wind energy potential is to be harnessed to full extent.

Small Hydro Electric Energy

Hydroelectric generation is still one of the most popular and 'cheapest' methods of electric

generation. But in India most of the rivers are dammed and many more are targeted for

construction of small as well as big dams.

However, in the recent past 'Run of the River' method of energy extraction is becoming

popular, and judicious use of this source can generate huge quantity of power even in remoteareas without construction of dams. In Karnataka alone, it is estimated that nearly 5533 MW of

power can be generated through mini hydro plants around Western Ghats, and total productionfor the entire range of Western Ghats could be well over 35, 000 MW.

Sri Ratnaker, an ingenious grass root innovator of Chikkamagalore district, has established over

273 trouble-free small units by now. There are many other turnkey entrepreneurs as well in

Karnatak and other states. In many parts of Western Ghats such units can run for 10 months in ayear. This technique should be used to the maximum.

These units tap energy from small streams but actually run of the river units harness potential of

running water of large rivers, especially in the hilly areas where the flow rate is fast. In WesternGhat region and also in the Himalayan range there is tremendous potential to harness the rapidswithout grossly affecting the nature of rivers.

Waste water flow in big cities is considerable, and this too could be used to generate

considerable amount of electricity. Author is in doubt as to why such a proposal presented to

Govt of Karnataka was not considered.

Solar Energy

Decades ago, author had envisaged that India would become a superpower by using solar

energy. But this has not been the case so far. With reference to solar energy, we have 5000trillion kWH/year capacity.

Present options available for harnessing solar energy are a bit costly, at least initially, so thewhole world is awaiting a major technological breakthrough, especially with reference to Solar

Photovoltaic cells. Some of the important options are Solar Central Tower, Solar Troughs,

Parabolic Dish, Solar chimney and Solar Ponds.


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Central Tower Solar Thermal Power Plant technology, present since 1988, has been running on a

very elementary technique. Focused Sunrays on a central tower through an array of mirrors,generate steam at high temperature and pressure at 15000C and run turbines. The technology was

costly but recent advances made in Spain have resulted in considerable reduction in cost. This

patented technology involves each heliostat having independent tracking system using separate

small photovoltaic panels on each Heliostat (Reflector mirror).

Solar Central Receiver

Another commercially popular technique is the Parabolic Trough Collector systems. The system

can even store heat for generating electricity at night. Here, arrays of long parabolic trough like

reflectors focus sunlight on a pipe at their center housed in a tube, containing heat transfermedium. This medium heats up to about 4000C and is used to generate steam which runs turbine.

Here too, considerable cost reduction has been achieved by tracking systems.


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Parabolic Trough Power Generator

Parabolic Dish system consists of fairly large parabolic dish type collectors with modified

Sterling Engine at the focal point, coupled to an Alternator to generate electricity. Generally it

comes in smaller capacity ranges of 5 to 10 kW. Cost of unit is rather high, but could be veryhelpful in remote areas.

Parabolic Dish Generator

Solar Chimney is a very promising low cost solar power generating system. It works on thesimple principle that hot air moves up. Cost of installation is fairly low and comes in a variety of

capacities. In India efforts are on to install a plant capable of generating 200 MW in Rajasthan.

In China some villages are already getting electricity from such chimneys. Smaller units would

be ideal for Indian villages as well, and MNRE other granting agencies should concentrate onthis type of decentralized useful design.


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Solar Chimney of Spain

Solar Pond is another interesting type of solar collector. A suitable sized pond is carefully filled

with layers of salt water of different densities. As a result heat trapped by higher density salt

layer at bottom is prevented from surfacing because density gradient obstructs convectioncurrents. Thus the lower areas of pond remain very hot at over 950C. Suitable engine is used to

extract this heat to generate electricity. In Israel, at Bet Ha-Arava, 5 MW of power was being

generated in a pond of about 250,000 sq.m area. In India too, smaller salt gradient ponds havebeen experimented with, but problems arose in controlling algal growth in upper layers of water.

Solar Pond

BHEL has gained considerable expertise in Dish type solar devices. Survey indicates that various

types of Solar Thermal plants have so far been tried in India.

Establishing smaller power plants has another advantage - it helps tremendously in reducing

transmission losses. Many power engineers feel that one cannot control the vagaries of nature,and hence solar technology cannot be relied on. Of course it is true, but no one is insisting that

the existing power plants be scrapped or replaced with solar. In fact, major advantages of solar

technology is that it is non polluting and decentralized, so that large number of villages can beelectrified, which is impossible if we go for only super thermal plants. Another important


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advantage is that these power plants can easily meet the demand during peak hours. This is a

major benefit since the deficiency in power supply is calculated on the basis of peak demand.

But our government has been very conservative in sanctioning Alternate Power plants.

Statements issued by MNRE officials such as "Companies are coming up with offers of huge

capacity of 50 MW and more, but we cannot sanction them without verifying if they would beable to deliver," leaves one surprised and confused. If the company is unable to 'deliver' theamount of electricity it claims it can, it should be the problem of the company. Unless, of course,

our Government is offering fabulous subsidies even before installation, as is being done for

Small Hydro Electric entrepreneurs.

Cost of solar thermal power has been estimated to be between 12 to 60 cents/kWh as mentionedin the Table 2.

Table 2: Summary of Solar power generation alternatives

Type Generating Capacity Range CO2 emission kg/kWh Cost of power cents/kWh

Parabolic Trough 5 to>150 MW 44.3 11.38Central Receiver 1 to 20 MW 33 14.77

Parabolic Dish 7 to 25 kW Nil 60.90

Solar Chimney 10 to 200 MW Nil 16.44

Solar Pond 15 to 1000 MW Nil 14.11Photovoltaic 1kW-1000 MW Nil 66.80

(Based mainly on Dr Nazish Qureshi's paper)

Solar Photovoltaic is not new, and a lot of small and large photovoltaic systems are now in use.Extensive use of these panels for remote area lighting and even pumping water should berecommended. Right now the cost is on the higher side, but nanotechnology is sure to reduce the

cost further. Inventors world over, including the author, are dreaming of evolving solar vehicles

and availability of low cost solar cells will make this dream a reality. Most of the Indian statesnow have provisions for feedback of excess power produced by private enterprises to the grid

and get paid. So, solar photovoltaic installations can get early payback. In fact Central Electric


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Authority has taken initiative to install grid interactive photovoltaic system on the roof of one of

their buildings.

We should also encourage use of Solar Cookers to cut down green house gases and indoor

pollution. Significantly, use of even one solar cooker would cut down emission of one ton of

Green house gases per year. There are many simple and low cost Solar cookers, some of thedesigns can be made at village homes(5).

Biomass Energy

Generating power using waste Biomass, on a large scale is not attractive, and would be another

source of pollution. But on a smaller scale at village level, it could be viable.

Bio fuels

Biodiesel and Bio alcohols are the highly hyped alternative fuels but lot of impracticality remains

attached with them. To start with, it requires large area to grow bio fuel plants.

Wave Energy

Wave Energy, i.e. extraction of electricity from ocean waves, is still in its infancy, though

scientists have been trying to harness wave power since 16th century. One of the largest Wave

energy system commissioned recently is in Portugal, and they have preferred to use PELAMISsystem. The two units of PELAMIS generate about 2.5 MW at the cost of 4.5 million Euros. But

many a new type of low cost systems are emerging. A system dubbed as 'Anaconda' is

considered as next best low cost Wave Harnessing system. Wave power generation too is subjectto some vagaries, so a couple of inventors, including the author of this article, are contemplating

on storing wave energy in such a manner that electricity can be generated perpetually day in andday out.

Author too is working on a model of Wave Energy Harnessing called Bhagiratha, a prototypeof which getting ready. The unit is specially designed for Tropical seas where the Wave Energy

levels are low. Thus the system envisages storing Wave power in the form of water in a reservoir

up nearby cliff, so as to enable production of Gridable Electricity on a continuous basis. Whencommissioned, this system could be the most reliable Wave Energy Harnessing systems in the

World.


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PELAMIS Wave energy harnessing system

Technology to harness energy from tides has progressed a lot. To harness it, a strong barrage has

to be constructed at places where river meets ocean, and as tides rise and fall, water passingthrough barrages turns generator both ways to produce power. In our country not much interest

has been shown on account of cost considerations as well as environmental constraints.

Sources like Geothermal, trapping energy from high speed wind flow at very high altitudethrough generators tied to huge kites, are exotic and formidably costly at present.

Whatever may the source for power production, one should never forget that the energy sources

are not unlimited. For a sustainable future we have to impose limits on growth of both population

and industrial pollution, and depend exclusively on Alternate Energy sources. It is time we startgetting prepared for a Fossil Fuel Free, and Air pollution free Society.

References

1. Dr Nazish Qureshihttp://www.geocities.com/pemnq/home.html

2. Shankar Sharma 2008, 'Impact of power sector on social and environmental issues:remedies' in "Lake 2008", 22 Dec - 24 Dec. Indian Institute of Science, Bangalore.

3. Internet sources on Central Power receivers, Solar Trough, Parabolic Dish, Solar

chimney, Solar Pond Wind mills and solar cookers.4. Energy (r)evolution, EREC, Greenpeace 2006

5. Ashok Kundapur, http://www.solcooker.net

6.http://www.ecofys.com/com/publications/documents/TER_FullReport_LesRes_2011-02-02.pdf

Ashok Kundapur | [email protected]

Dr Ashok Kundapur is a proactive environmentalist, an active advocate of Alternate Energy and

an expert on Solar Cooker. He is now working on and has almost perfected Harnessing WaveEnergy especially for Tropical Seas. He is presently based at Udupi in Karnataka.
http://www.geocities.com/pemnq/home.htmlhttp://www.geocities.com/pemnq/home.htmlhttp://www.solcooker.net/http://www.ecofys.com/com/publications/documents/TER_FullReport_LesRes_2011-02-02.pdfhttp://www.ecofys.com/com/publications/documents/TER_FullReport_LesRes_2011-02-02.pdfhttp://www.geocities.com/pemnq/home.htmlhttp://www.solcooker.net/http://www.ecofys.com/com/publications/documents/TER_FullReport_LesRes_2011-02-02.pdfhttp://www.ecofys.com/com/publications/documents/TER_FullReport_LesRes_2011-02-02.pdf


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