Government of India, under the National Solar Mission has set a target of 1,00,000 MWp
power generation through solar energy in the country including 40,000 MWp to be
generated through Solar Rooftop plants in various sectors.
In order to achieve this magnitude of capacity, Gujarat Government has taken up the target
of 8,024 MWp capacity of solar energy by 2021-22, of which 3200 MWp is to be generated
through Solar Rooftop Power Plants.
In such project, there is no requirement of land. Energy is consumed where it is generated
and the element of transmission loss and wheeling loss are reduced to nil. Thus, such
power plants would be in interest of the public at large as well as the state utilities.
Therefore considering the future in mind MNRE has set us a nationwide subsidy plan
providing subsidy for residential Rooftop solar plants up to 40%. In compliance with this,
Government of Gujarat has launched a very ambitious project to set-up 0.8 Mn Rooftop
Solar Power plants by 2021-22; the project is named “SURYA GUJARAT”.
The target is huge, but achievable, considering the previous efforts from various Solar EPC
companies in Gujarat that have scaled up 450+ MWp capacity within Sept 2019-Feb 2020.
The advantages on Solar rooftop are immense, with a negative carbon footprint and a life
of 30 years, the system is highly reliable. The benefits of solar can be simplified in 4L:
Low Carbon Footprint – Solar Power has proven to be one of the
most environment friendly source of power with lowest carbon
Emissions. (Refer Adjacent Chart)
Low cost – Solar power has proven to be one of the cheapest
source of electricity in recent past with discovered rates as
low as 1.75 Rs/KWp in latest tenders.
Low Maintenance – In absence of any mobile part, the system is
very robust and has low maintenance.
Long Life – Major solar panel manufacturers offer 25 year
performance warranty, showcasing the system reliability.
With continuous improvement in
the Solar Module (SPV-Solar Photovoltaic), the efficiencies are improving day by day.
Latest advancement such as MONO-PERC modules, Half-cut cells etc are now available in
market with efficiencies as high as 23-24%.
Solar Rooftop has a scope to be installed at various locations such as:
Solar Rooftop at Residential buildings / house
Solar Rooftop at Industrial buildings
Solar Rooftop at Government buildings
Solar Rooftop at Hospitals
Solar Rooftop at Schools
Solar Rooftop at Commercial Complex
Solar Rooftop at Hotels
Solar Rooftop at Petrol Pump
Government of India & various state governments have announced solar policies that
provide guidelines to commence Solar Rooftop work at different sectors, the tariff for Solar
Rooftop power plant, Subsidy for Solar Rooftop & its structure, Application for Solar
Rooftop Methodology and various such details.
Subsidy for Solar Rooftop:
Government of India has announced a subsidy of 40% i.e. Central Financial Assistance
(CFA) to install Solar Rooftop Power plant at residential sector throughout India. Though
the Subsidy greatly varies from certain state to other, where the extent of subsidy is as high
as 70% such as in case of HP, J&K.
The implementation of solar project through subsidy for residential sector has been very
successful in Gujarat which has set a benchmark throughout the country by aggregating
110MWp (2018-19) & 450 MWp (2019-20) which is highest in the residential category.
Certain states have followed the path and implemented dedicated online portals for
managing the applications, such as Telangana, Rajasthan, D&NH etc.
Few states are also offering additional subsidy apart from CFA to promote the usage.
Eg. Gujarat until 2019 offered a state subsidy of 10,000 Rs/Kwp ( Max upto 20,000 Rs) in
addition to the CFA for setting up Solar Rooftop Power Plant at residence.
There are various other provisions for setting up Solar PV plant (Solar Photovoltaic Plant)
in form of subsidy from central government. Central Financial Assistance / Subsidy for
Solar rooftop plant have been effect at present, with a primary aim to elevate the reliance
on renewable energy & meanwhile promote the benefits of solar power to the user, thus
creating awareness for it.
Following are few subsidies presently in effect:
COLD STORAGE-35% subsidy offered by centre (NHB – National Horticulture
Board) on installation of solar rooftop at cold storage
all over India, maximum amount up to 35lacs.
Corporate Subsidies – Indian Oil (IOCL), Bharat Petroleum (BPCL), Hindustan
Petroleum (HPCL) provides subsidy from 55-65% to install on-grid / off-grid solar
rooftop power plant at retail outlets.
AGRICULTURE SOLAR PUMP SET – GOI under KUSUM (Kisan Urja Suraksha Utthaan
Mahabhiyaan) & SKY (Suryashakti Kisan Yojana) project offers highly subsidized
Pump set to farmers and other provisions to set up group Power Plant.
To avail any subsidy, one can contact Bison Engineers via mail at
Meanwhile, it is forecasted that the majority of subsidies for Solar PV power plant shall be
abolished by 2022.
At present the total installed capacity of Solar Power throughout India is near about 38
Gigawatts, which accounts for 9.8% of total installed Power Capacity of India. This is
considerable growth, looking at 200% growth in past 3 years. Though the target is to reach
100 Gigawatts by 2022 out of which 40 GW is expected through Rooftop Solar plant.
Not only has Solar Power proved to be reliable, but also proved to be very cheap compared
to conventional power plant requiring minimum maintenance, minimum resources, less
installation cost compared to similar plant size of conventional power plant. These factors
have ensured interest of various private industries to invest in Solar Power as a mainstay
of power reliance throughout the globe.
- Modernization in Solar Industry:
There have been various modernizations in solar industry recently. The list includes
Nanocrystal cells, methods to keep the solar module cool, Organic Photovoltaic cells,
Pervoskite materials etc.
Though the industry is already sizable, the majority of solar modules being used around
the globe whether in Ground mounted utility scale solar projects, or scattered rooftop solar
plants consists majorly of 1 st Generation solar modules. The primary reason being cost of
The 1G solar panel, majorly consist of the polycrystalline cells made either crystalline
silicon (c-Si) or Ga-As wafers and have a matured technology in terms of its fabrication &
mounting technologies globally. Though there are some limitations such as bulky modules,
space required, don’t comply with architecture, limited efficiencies etc.
The possibility of solar are immense, according to a study in 2001, the Solar radiation
received on earth within 1 hour is more than total energy used worldwide throughout
- Thus the possibility to harness solar energy is not restricted to 1G solar module. The
modern evolution in solar technology as mentioned above is 3G solar cells i.e.
photosensitive materials being printed on polymer sheet, which makes them light, flexible,
low cost and easy to comply with various architectural features.
The Printed solar cells majorly consist of Perovskite materials (abundant, cheap, but not
yet stable for mass utilization) & OPV -organic photovoltaic’s or also called as organic solar
cells (photosensitive material is based on carbon molecules such as fullerene lattice). The
OPV is a promising technology as the photosensitive material can be formed as “ink” and
deposited at low temperature over a large area of cheap plastic through conventional
The design, type, colour, orientation of OPV – organic photovoltaic’s is not limited and can
be customized as per application. Example- A outdoor glass can be inked using the OPV
tech, which can be used for glass window generating electricity.
Construction of Organic Solar Cell :
Unlike most inorganic solar cells, OPV cells use molecular or polymeric absorbers, which
results in a localized exciton. The absorber is used in conjunction with an electron
acceptor, such as a fullerene, which has molecular orbital energy states that facilitate
electron transfer. Upon absorbing a photon, the resulting exciton migrates to the interface
between the absorber material and the electron acceptor material. At the interface, the
energetic mismatch of the molecular orbitals provides sufficient driving force to split the
exciton and create free charge carriers (an electron and a hole).
Benefits of OPV – Organic Photovoltaics
Low-cost manufacturing: Soluble organic molecules enable roll-to-roll processing
techniques and allow for low-cost manufacturing.
Abundant materials: The wide abundance of building-block materials may reduce supply
and price constraints.
Organic photovoltaic’s are sustainable: Since the material yield in this tech is almost 99%
i.e. very low material is wasted while manufacturing (unlike 1G solar panels). This indeed
is the motive to use renewable energy i.e. sustainability.
Flexible substrates: The ability to be applied to flexible substrates permits a wide variety of
Limitations of OPV – Organic Photovoltaics
Low Efficiencies: The low efficiencies of OPV cells are related to their small exciton
diffusion lengths and low carrier mobility’s Substantial efficiency gains have been achieved
already by improving the absorber material, and research is being done to further optimize
the absorbers and develop an organic multi-junction architectures.
Low Life: Life of Organic PV is significantly lower than inorganic cells. Though improved
encapsulation and alternative contact materials are being investigated to reduce cell
degradation and push cell lifetimes to industry-relevant values.
The Future of OPV solar technology is bright and is stated to bring a revolution by allowing
us to incorporate usage of Solar Technology in all forms of our life, which at present cannot
be imaged. Whether it is your window, dining table, Car windshield, Glass Roof, Blinds etc
solar power can be generated at all places using OPV.