Renew India: Public Transport with no Carbon Footprints. by Team Greenergy
India is set to tackle the pollution problem in the public transport sector, joining hands with Renewable Energy
This plan aims to modify the existing public transport mode of Rickshaw (a compact three wheeler vehicle used in a number of Indian metros) and reduce the overall CO2 emissions. The electrification of Rickshaws will reduce the carbon emissions many folds.
To charge the batteries, the energy shall be derived from renewable energy sources endemic to that particular region of the country. In this way, complete potential of a particular region can be utilized effectively and with minimum costs. The model can be applied to all the major metros of the country such as Mumbai, Delhi, Chennai, Kolkata, Vizag and Ahmedabad where Rickshaws throng the streets in abundance and later spread to the entire country. Since the utilization of renewable energy can generally be costly for individuals, the plan aims at mass production of renewable energy followed by supplying it as per individual vehicle needs.
Solar farms to charge batteries shall be incorporated. This can be done by using an estimate of the daily rickshaw energy requirements and setting up a plant of the required area.
India has a huge coastline of 7500 kilometers with gargantuan potential of wave energy. Even if 1% of the region is harnessed i.e. 75 km total potential power which can be generated is about 472.5MW
Wind is the second highest harnessed source of renewable energy. Windmills have been popular and predominant in various parts of India for electricity generation. Since wind is generally erratic and not very reliable at times, the projects should be coupled with other sources such as Solar or biogas for effective implementation.
Biogas and Biofuel Energy:
Biogas generators shall be used to charge batteries in the areas close to Biogas plants. This is mainly for regions where none of the other renewable sources are available. Even though the burning of biogas is not carbon-free, the pressure on existing crude oil derivatives can be heavily reduced, in the process helping to make India energy independent. Similarly, biofuels can be used to run the generators. Only minor tweaks are needed in the already existing generators to make them compatible with biofuels.
Which proposals are included in your plan and how do they fit together?
Our proposal aims to revamp a large section of Indian public transport i.e. auto-rickshaws by replacing conventional fuel based engine operation to electric. The current system of rickshaws use petrol and CNG as their primary source of fuel. Even though the vehicles have low power and are not that polluting compared to cars or transportation truck, the effect of their numbers far outstrips this fact and thus makes them one of the heaviest polluters in the country.
Electric vehicles have zeros emissions. However, it is important that the electricity comes from a clean source for this to hold completely true. If the batteries are charged by say, coal or petroleum produced electricity, then the reason behind incorporating electric vehicles can be put into jeopardy. Thus, the charging of the batteries shall be done at designated outlets in and around the city where provision shall be made for charging with renewable energy endemic to that particular region. The rickshaw operators can merely deposit the used up batteries there in exchange for a new one by paying a fee.
Since India is blessed with a wide variety in geographic and climatic conditions, optimum use of renewable energy can be made which produces the best result. For instance, Mumbai which is coastal can make use of wave energy and Delhi which is landlocked can make use of Solar and Biogas. The plan involves setting up of hybrid energy plants thus reducing the dependence entirely on one energy source.
The growing impetus for using renewable energy in the public transport field shall also find its way later into the private transport sector. Once the benefits of this plan are showcased and forms an effective model of clean energy at minimum cost, it will not be long before the effect resonates into Electric Cars.
Case Study: Mumbai, Maharashtra
Number of Rickshaws: 300,000 2 Batteries: 12 V 65 Ah; Total Voltage: 24 V
Motor: 1 KW Weight: 540 kg(with passengers)
Motor continuously needs 10 A of current .
A 250 W 24 V Solar panel on top of the rickshaw will add 5 A of current (including losses)
Solar Panel Cost: Rs 13,000
Motor + Controller + Wiring: Rs 21000
Batteries: Rs 24000
Regenerative Braking Circuit: Rs 2000
Total Electrification Cost: Rs 60000
All the batteries will be charged by a mother station which will comprise of Solar-Wind hybrid devices. The batteries will then be delivered to a daughter station all over the city from where rickshaw operators can change their battery every night.
Solar-Wind Hybrid Plant:
Units of Electricity to be produced: 480,000 per day by the hybrid system
15 A supplied at 27 V(Overvoltage) is 0.405KW(in one sec) needs to be supplied for 4.1 hours which is 1.6 Kwh of electricity.
Solar panel of 405 W can charge a battery in 4 hours
Wind turbine of capacity 500 W (extra due to varying wind speeds) can charge a battery in 4 hours
Blade Diameter: 4.5m for 480,000 units of electricity
Solar Panel for hybrid System: 480W 24V (2 pieces of 240W)
Cost: INR 32,500
Wind: 500W 24V Cost: INR 60,000
For wind (Using Weibull distribution curve for probability against wind speed which will give us max probability of a particular wind speed)
Inverter, cabling, tower, Insurance: INR 71,000
Storage battery: 2 batteries of 12V 200Ah ; Cost: 52,000
Total: INR 2,15,000
Wind during months of June, July, August average 4m/s probability: 0.16
No of hours: 4 (at max power)
Total units of electricity produced by the hybrid system:
0.48KW x7hrs (solar) + .5KWx 4hrs (wind) = 5.36Kwh
Energy can be stored in a Parent battery that can charge 3 battery packs
Total units of hybrid devices needed at mother station : 1,00,000
Cost for electrification of One rickshaw: INR 60,000 + 24,000 (for spare battery)
Total Electrification Cost: 2,520 crores
Total Cost of Project: 2150 + 2520 = 4,670 crores
Biogas Backup Plant:
Biogas can be used in case of deficit of other forms of renewable energy. For example, in the case of overcast weather in Solar Plants or in the case of sudden power failure. The changes required to be made to a normally operating Natural gas generator are very few for using biogas in place. Commercially, a number of Gensets from Duetz, MAN, etc are available for use. Biogas and Natural Gas inherently are not completely pollution free. However, this is eclipsed by the fact that biogas is effectively available free of cost.
Cost of Biogas Generators: Rs 26 lakh for 1050 KW engine
Average calorific value of biogas is 20 MJ/m3 (4713 kcal/ m3).
Rate of Supply of gas: 0.1373 m3/sec (@Thermal efficiency 45% and Mechanical Efficiency 85%)
Sample 62.5 KVA Generator running on Biogas:
Per hour consumption in Kgs: 12.5
Net saving per day(compared to a similar capacity Diesel Generator): 5,000
Case study : Visakhapatnam
Number of rickshaws: 15000
The mother station is a wave energy plant that will charge all the batteries and deliver to the daughter stations.
Considering related past data on wave properties for calculations from department of oceanography, GOI
Taking Mean effective wave height and wave period:
Feb-May: 1.025 m 5.8 sec
June-Sept: 2.02 m 6.5 sec
Oct-Jan: 1.1 m 5.85 sec
- We have formula P=0.55 * H^2 * T
Where, H: mean significant wave height
T: wave period
P: wave energy in kW/m of wave front
For Feb – May:
- We get Wave power P= 3.352 kW/m wave front
For Jul - Sept:
- We get Wave power P= 14.58 kW/m wave front
For Oct - Jan:
- We get Wave power P= 3.89kW/m wave front
Taking efficiency as 50% , 300 m of wave front and 10 hours of sea state hours per day.
We get, P = 14.58*0.5*0.3*10 = 21.87 MW–hr
Reduction in CO2:
Taking a model of 300,000 Rickshaws in the city of Mumbai
Kilometers traveled per day: 80 km
Amount of CO2 generated by a CNG Rickshaw: 2.8 kg per kg of CNG (113 grams/km per rickshaw)
Therefore total amount of CO2 emissions per day: 2712 tonnes of CO2.
Amount of CO2 emissions saved per year:
There are an estimate of 1 million rickshaws in India. Therefore, total amount of CO2 saved in the entire country per year: 3.066 million tonnes of CO2.
Explanation of the emissions scenario calculated in the Impact tab
The results of the impact tab show a moderate rise initially when the entire setup will need to be created, followed by a robust decline starting 2040 when the plan rolls out completely and electric rickshaws powered by renewable energy become ubiquitous.
The factors which were accounted for choosing the settings can be justified as follows-
1. India being the first country in the world to have a separate ministry for new and renewable energy, follows an aggressive stance towards dealing with climate change. Our proposal links at all times with the government policies and incentives.The 550 ppm CO2 equivalent limit would be the target for our proposal as it aims to reduce 3 million tons of CO2 emissions over a period of 10 years.
2. The government has set up new policies like FAME, to provide tax incentives to electric vehicles and infrastructure for the same which will be incorporated in our plan. Also the 'Make in India' initiatives have resulted in a funding from multinationals of over $4 billion towards new technologies in the field of renewable energy. These schemes help India and our proposal have a greater energy efficiency due to increased investments and robust policies.
3. Currently, India highly relies on wind energy and is going to setup the world's largest solar plant in Madhya Pradesh. India has recently signed international pacts towards development of nuclear technology.
Research and studies are on regarding potential of CCS in India.
Hence, India is the ideal place for all no carbon technologies.
What are the plan’s key benefits?
Key Advantages of the Plan:
1. Tremendous reduction in the CO2 emissions in the public transport sector of the country. For a million rickshaws, 3.066 million tons.
2. Will give positive impetus to the private car sector in the near future.
3. Reduced dependency on foreign crude oil. Will help India becoming energy independent.
4. Electric rickshaws operate silently as compared to the noisy operation of conventional rickshaws thus reducing noise pollution.
5. Increased awareness amongst the masses about renewable energy and their benefits. Currently, the population of India is currently relatively alien to renewable technology.
6. Reduced air pollution (soot, NO2, etc) which is a chronic cause of respiratory problems especially in the urban regions.
7. Since the plan makes use of several new technologies, it will create an employment boost in the energy industry.
8. Diesel and petrol emission cause a host of cardiovascular diseases, respiratory ailments and cancer.
What are the plan’s costs?
Cost for electrification of One rickshaw: INR 60,000+24,000 (for spare battery)
Total Electrification Cost: 2520 crores
Total Cost of Project: 2150 + 2520 = 4670 crores
Daily Cost an auto rickshaw Driver pays: INR 35(1/3rd of what he pays daily as of now)
Daily Cost Recovery: INR 1.05 crores
Yearly Recovery: 383.25
No. of years( payback period) =4670/383.25=12-13 years
If Each rickshaw gets an incentive of INR 30,000 under FAME and every year 0.9 million credits can be sold by Mumbai:
Total electrification cost: 1620 crores
Total Cost of project: 1620 + 2150= 3770 crores
Selling 0.9 million credits can Raise 64.35crores annually
Yearly recovery: 447.6 crores
Payback period: 8.422 years
Capital and operating expenditure of wave energy plant at Visakhapatnam:
Capacity of the plant is 2.187 MW
Considering India in high cost geography
Total approximate capital expenditure (From table)= 16.05*2.187 = 35.1 USDm =233.2 crores Rs
Total approximate operating expenditure = 328050 USD / yr = 2.18 crores Rs/yr
What are the key challenges to enacting this plan?
1. Difficult to change the fixated mindset of drivers to make use of greener technology. Strides in this field has already been made in the year 2011 but without any fruits.
2. Space crunch in densely populated cities like Mumbai and Delhi. Thus, additional space requirement for hybrid charging stations can pose a real difficulty. The plants alternately would be situated on the outskirts of the city and thus would incur additional transportation costs.
3. Production of batteries with the existing technology (Lead Acid) can lead to extensive environmental damage since Lead is a poisonous metal.
4. Dearth in the number of charging stations can deter rickshaw owners from adopting the new form of rickshaws. There may be a case wherein the rickshaw drivers demand for more recharging stations first and the government on the other hand demands more adoption for increased number of recharging stations for sustainability. Thus may be a classic case of demand vs supply face off.
1. Short term (3-5 Years): Retrofitting already existing rickshaws in a medium sized city. This will set an example which can be emulated by bigger cities. The initial phase of the plan shall be modifications of the existing rickshaws at a subsidized cost. Under the incentive of “Early Bird Offer”, discounts can be given if the replacement is adopted before a certain date.
2. Medium Term (5-10 years): In the medium term, after all the existing rickshaws are transformed, newer rickshaws can be manufactured which come pre-fitted with electric motors.
3. Long Term (10-18 years): Existing old Lead Acid Batteries to be replaced by lighter and efficient Li-Ion batteries. The existing battery set up can be used to power private vehicles. The already existing set up for rickshaws can be extended with increased power capacity of hybrid power supply station for cars. The earnings from this sell off can be used to give subsidies to public transport vehicles like buses, taxis and rickshaws.
1.Electric Auto Rickshaws
The authors had set up an unsuccessful crowd funding campaign for development of a retrofit kit and business proposal for electrification of Rickshaws in Ahmednagar, Maharashtra.
2.Development of Bio-Hybrid Three wheeled Auto-Rickshaw for Urban Transportation
In this work the design problem of a three wheeled auto rickshaw & the impact of hybridization on fuel consumption and CO2-emission reduction for these types of vehicles were discussed. Hybrids proved to be expensive, polluting & less efficient compared to their all electric counterparts, steering our work in all electric direction.
3.Heading for 100 % renewable urban transport: Policy recommendations
This report provides guidelines to the Government and citizens for greener living via examples of green cities.
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