Uninterrupted Green Power using Floating Solar PV with Pumped Hydro Energy Storage & Hydroelectric in India

Abstract

The 100 GW Solar capacity by 2022 is a target which is being aggressively pursued by India. However, the intermittent nature of Solar PV makes it essential that adequate energy storage capacity is created to ensure uninterrupted power for consumers from renewable sources. Pumped Hydro Energy Storage (PHES) is a dominant form of energy storage being used since long by utilities. This paper aims at combining FSPV with PHES & Hydroelectric to try & create a model for a

Full text

IJIRST –International Journal for Innovative Research in Science & Technology| Volume 3 | Issue 04 | September 2016
ISSN (online): 2349-6010
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94
Uninterrupted Green Power using Floating Solar
PV with Pumped Hydro Energy Storage &
Hydroelectric in India
Aseem Kumar Sharma
Pro. Dr. D P Kothari
Research Scholar
Research Guide
Chandradeep Solar Research Institute, Kolkata,
India
Gaikwad-Patil Group of Institutions, Wardha Road,
Nagpur, India
Abstract
The 100 GW Solar capacity by 2022 is a target which is being aggressively pursued by India. However, the intermittent nature of
Solar PV makes it essential that adequate energy storage capacity is created to ensure uninterrupted power for consumers from
renewable sources. Pumped Hydro Energy Storage (PHES) is a dominant form of energy storage being used since long by
utilities. This paper aims at combining FSPV with PHES & Hydroelectric to try & create a model for a source of Uninterrupted
Green Power. It attempts to estimate the potential of this model in large reservoirs in India. It also discusses the advantages,
challenges & environmental impact related to the concept. It estimates that Uninterrupted Green Power Supply of 13GW round
the year can be obtained from the mentioned reservoirs using FSPV+PHES & Hydroelectric. The reduction in evaporation loss is
expected to be 1692 MCM per year in these reservoirs. This involves installation of around 60 GWp of FSPV & 30GW of PHES
capacity.
Keywords: Floating Solar PV, Pumped Hydro Energy Storage, Hydroelectric, Uninterrupted Green Power
_______________________________________________________________________________________________________
I. INTRODUCTION
The 100 GW Solar capacity by 2022 is a target which is being aggressively pursued by India. However, the intermittent nature of
Solar PV makes it essential that adequate energy storage capacity is created to ensure Uninterrupted Green Power for consumers.
Pumped Hydro Energy Storage (PHES) is a dominant form of energy storage being used since long by utilities. India is blessed
with enormous water resources & large reservoirs. Many PHES installations & hydroelectric plants already exist. There is good
potential for Floating Solar PV (FSPV) on these reservoirs. In case FSPV is used with PHES & hydroelectric in the existing
reservoirs, it can result in a source of Uninterrupted Green Power for the utilities. This paper aims to research, estimate &
analyse the potential in India for this model in the present & future.
II. OBJECTIVE
The main objective of this paper is to establish a basis for treating FSPV used with PHES & existing hydroelectric capacity as a
source of Uninterrupted Green Power in India throughout the year to overcome the intermittent nature of FSPV. The basic
technology for both FSPV & PHES is well established & functioning successfully in many countries. But a combination of the
same with hydroelectric to meet the requirement of Uninterrupted Green Power for the Indian consumer is the need of the hour.
The quantification of the concept for large reservoirs in India to get an idea of the scale of its potential is demonstrated. An
analysis of its advantages, challenges & environmental impact is also attempted.
III. METHODOLOGY
The existing technology for FSPV was studied using reference available. The output of the ground mounted Solar PV power
plants in India (e.g. Gujarat sites taken as ref.) has been considered for arriving at the power profile for FSPV, as there is no
history of FSPV plants operating in India. This is a conservative approach as the output of FSPV is expected to be higher than
ground mounted. It is to be noted that the output figures of Gujarat Solar PV sites are also available online in real time.
The performance of PHES & Hydroelectric is well documented & established in India over the years. The output profile for
the same has been taken from the relevant references quoted.
The advantages, challenges & environmental aspects have been enumerated using references available on present FSPV
installations & research undertaken (e.g. the effect of shading). The standards in the US have also been used as reference to the
environmental aspects.
The figures on reservoir surface area have been taken from relevant Govt. of India publications quoted. The calculations for
the output for FSPV with PHES & Hydroelectric illustrated are for demonstration of the concept & to quantify the scale of the

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potential. The actual capacity & output for each site may depend on grid requirement, evacuation, type of modules, tracking,
insolation, weather patterns & local conditions.
IV. BACKGROUND & LITERATURE SURVEY
On FSPV & Solar PV performance
The following literature supports the concept of FSPV. It elaborates the performance, advantages, challenges & environmental
impact of FSPV & used as ref. in relevant sections here.
‘Variability of Photovoltaic Power in the State of Gujarat Using High Resolution Solar Data Technical Report-(9), discusses
the variation in Solar PV Generation in Gujarat, India. This is indicative of the power profile expected in FSPV in India & used
as a ref. here. The paper ‘A Study on Power Generation Analysis of Floating PV System Considering Environmental Impact’
(12), discusses the performance of typical FSPV plant in relation to environmental factors. This paper compares and analyzes the
empirical data of the floating PV system, which K -water has installed, with that of the existing overland PV and has verified that
the generating efficiency of floating PV system is superior by 11% and more. The paper ‘A study on major design elements of
tracking-type floating photovoltaic systems’ (13) discusses the Tracking feature in FSPV. In general, it is known that on the
ground, the power generation of a dual-axis tracking-type is 30% greater than a fixed-type. Though not covered here, tracking in
FSPV is a point for future development for improved output. The paper - ‘A Case Study on Suitable Area and Resource for
Development of Floating Photovoltaic System(14) discusses issues related to site selection for FSPV. In this paper, property
survey, on-site survey, and photovoltaic resource survey were conducted with the case of 100 kW tracking-type floating
photovoltaic system in Hapcheon Dam. Water depth (data and actual measurement), solar distribution, shade analysis (analysis
of Solar Pathfinder), effect of floodgate opening during flood (flow modeling), and system connection were reviewed, as well as
connectivity with power system. In addition, altitude of the sun at the installation point was surveyed for each season and hour to
select optimal tilt angle and separation distance for photovoltaic arrays. The points raised may be useful in site selection in
reservoirs. The paper - Installation and Safety Evaluation of Tracking-type Floating PV Generation Structure (15) discusses the
results of investigations pertaining to the design, fabrication, and installation of tracking-type floating PV energy generation
structure system. The points are to be considered for installation, maintenance & safety aspects of FSPV.
On Energy Storage including PHES
The following literature enforces the case of PHES being a good choice for GW level energy storage & its value to complement
FSPV.
The presentation ‘Grid Integration of Renewables(1) discusses the status of various sources of power generation in India,
variation in demand & generation as well as possible integration of renewables with the grid. It also touches upon PHES in India.
The variation in Hydroelectric indicated is used here as ref. The report ‘Grid Energy Storage (2) discusses the status of grid
energy storage in the US. It also compares the development of various energy storage technologies. It indicates that a) Pumped
hydroelectric energy storage is a large, mature, and commercial utility-scale technology currently used at many locations in the
United States and around the world. b) New capabilities of pumped hydro, through the use of variable speed pumping, is opening
up the potential for the provision of additional services that may be used to assist in the integration of variable generation
sources. c) Projects may be practically sized up to 4,000 MW and operate at about 76%–85% efficiency, depending on design. d)
Pumped hydro plants have long lives, on the order of 50-60 years. e)As a general rule, a reservoir one kilometer in diameter, 25
meters deep, and having an average head of 200 meters would hold enough water to generate 10,000 MWh. These inferences are
used here as ref. The presentation ‘IndustRE project -Is industrial demand response complementary or competitive to pumped
hydro storage?’(3) discusses the demand response with respect to variable speed PHES. It indicates that demand response has
similar characteristics with decentralised storage solutions. A large part of the demand response potential can be activated today
without any infrastructure requirements and without geographical limitations. The paper ‘Developing Cost-Effective, Flexible,
Reliable GWh-scale Energy Storage – An eStorage Project Update’ (4), discusses the status of energy storage including PHES in
Europe. It indicates that one plant alone will not provide the necessary storage flexibility to reach the EU’s 2050 goal & many
more plants are needed. The article ‘Pumped Storage Hydro Power Plant’ (5) discusses the status of large PHES in India. It
indicates that PHES can help in grid stability, reliable supply & quality power in India. The presentation ‘Evaluating The
Energetic And Carbon Performance Of Flexible Power Grid Resources—A Net Energy Analysis’ (10) discusses the Flexible
Power Grid Sources including comparative lifecycle CO2 emissions per MWh of various storage technologies with PHES having
the lowest figures. The paper Feasibility Study of a Hydro PV Hybrid System Operating at a Dam for Water Supply in Southern
Brazil (32) discusses the pre-feasibility study conducted on the subject with Homer software . It indicates that the hydroelectric
plant with a capacity of 227 kW can operate together with 60 kW of PV modules. This combination will result (in one of the
configurations considered) at an initial cost of USD$1715.83 per kW installed and a cost of energy of USD$ 0.059/kWh.
It is apparent from above references that significant work has been done on various aspects of PHES & FSPV. However, this
paper aims at combining FSPV with PHES & Hydroelectric in existing major reservoirs in India to try & develop a model for
Uninterrupted Green Power Source. It attempts to estimate the potential of this model in large reservoirs in India. It also
discusses the advantages, challenges & environmental impact related to the concept.

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V. BASIS OF ESTIMATE POWER PROFILE IN RESERVOIRS USING FSPV+ PHES & HYDROELECTRIC
(1,5,6,8,9,12,13,16,17,18,27,32,33,35,36,38,39)
Based on the experience in existing installations, a conservative estimate of 40 MWp capacity FSPV can be taken per sq. km of
reservoir surface area covered. (e.g. ref.18 - Kyocera using 74 MWp per sq. Km, a much higher value)
The coverage of 20 % of total reservoir surface area can be considered with negligible impact on environment. The saving in
water due to reduction in evaporation losses is taken as 1.125 MCM per year per sq. km. of covered area (27) – a minimum
reduction in evaporation loss of 50%, Ref. 16 – the evaporation loss in reservoirs in India being 2.25 million cubic meters
(MCM) per sq. Km per year.)
A typical model for contribution by various sources in a day is shown in Table 1. The power profile for a typical day will be as
given in figure 1 below for Oct. to June. (9) – the NREL report on variability of Solar PV output in Gujarat is taken as a
reference) A peak generation of 65% of installed capacity of FSPV of 3GW has been taken based on annual average observed.
PHES output indicated is with 80% efficiency. The Hydroelectric output is taken with average annual output of 30% of
installed capacity.
The typical energy export profile will be as per fig.2. We observe from the profile that the possible combination for
uninterrupted power exported to grid throughout the year is approx. 17% of the installed FSPV MWp capacity plus 33% of
existing Hydro Power MW capacity for installations in India. The PHES capacity needed is nearly 50% of FSPV capacity.
Though adequate here for estimating the potential, this combination will have to be worked out in detail for each site based on
local conditions ,historical data, future plans & other factors.
VI. ASSESSMENT OF POWER PROFILE IN RESERVOIRS USING FSPV+ PHES (1,5,6,8,9,16,17,18,39)
The assessment of output for FSPV with PHES & Hydroelectric for a typical reservoir in India is as follows -
Sardar Sarovar, Gujarat
Total reservoir surface area K = 375.33 km2
Present hydroelectric generation capacity A = 1450 MW
Proposed area coverage for FSPV- R = K X 0.2 = 375.33X 0.20 = 75.06 km2
Proposed FSPV rating B = 75.06 X40 = 3002.4 MWp
PHES capacity needed = B X 0.5 = 3002.4 X 0.5 = 1501.2 MW
24X7 Power exported to grid throughout the year = (A X 0.33) + (B X 0.17) = 1000 MW
Reduction in evaporation water loss per year = R X 1.125 = 75.06 X 1.125 = 84.44 MCM
Table – 1
Typical hourly power profile for a day - Sardar Sarovar - Oct. to June
Time
FSPV Generation
MW
FSPV to Grid
MW
FSPV to PHES
MW
PHES to Grid
MW
Hydro to grid
MW
Total Export to
grid MW
5:00 AM
0
0
0
500
500
1000
6:00 AM
0
0
0
500
500
1000
7:00 AM
0
0
0
500
500
1000
8:00 AM
300.24
0
300.24
500
500
1000
9:00 AM
600.48
500
100.48
0
500
1000
10:00AM
1501.2
500
1001.2
0
500
1000
11:00AM
1801.44
500
1301.44
0
500
1000
12:00PM
1981.584
500
1481.584
0
500
1000
1:00 PM
1891.512
500
1391.512
0
500
1000
2:00 PM
1831.464
500
1331.464
0
500
1000
3:00 PM
1801.44
500
1301.44
0
500
1000
4:00 PM
1351.08
500
851.08
0
500
1000
5:00 PM
750.6
500
250.6
0
500
1000
6:00 PM
0
0
0
500
500
1000
7:00 PM
0
0
0
500
500
1000
8:00 PM
0
0
0
500
500
1000
9:00 PM
0
0
0
500
500
1000
Time
FSPV Generation
MW
FSPV to Grid
MW
FSPV to PHES
MW
PHES to Grid
MW
Hydro to grid
MW
Total Export to
grid MW
10:00PM
0
0
0
500
500
1000
11:00PM
0
0
0
500
500
1000
12:00AM
0
0
0
500
500
1000
1:00 AM
0
0
0
500
500
1000
2:00 AM
0
0
0
500
500
1000
3:00 AM
0
0
0
500
500
1000

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4:00 AM
0
0
0
500
500
1000
Fig. 1: Typical hourly power profile for a day - Sardar Sarovar - Oct. to June
Fig. 2: Typical energy export profile for Sardar Sarovar - Oct. to June
VII. RESULTS
In line with the example given above, the results for various reservoirs are summarised in Table 2 below
Table – 2
Potential for Floating Solar PV with Pumped Hydro Energy Storage & Hydroelectric in Large Reservoirs in India as a Source of Uninterrupted
Green Power
Reservoir
Name
Reservoir
Surface Area
Sq. Km.
Hydro
electric
MW
FSPV Area
Cover
Sq. Km.
FSPV
capacity
MWp
PHES
capacity
needed MW
Uninterr-upted Green
Power exported to
grid MW
Reduction in evap.water
loss per year Million Cubic
Meter (MCM)
Sardar
Sarovar
375.33
1450
75.06
3002.4
1501.2
1000
84.44
Nagarjun
Sagar
284.90
815.6
56.98
2279.2
1139.6
656
64.10
Srisailam
616.42
1670
123.28
4931.2
2465.6
1390
138.69
Sriramsagar
450.82
36
90.16
3606.56
1803.28
613
101.43
Pong
260
396
52
2080
1040
484
58.50
Tungabhadra
378.13
127
75.62
3025.04
1512.52
514
85.07
Linganamakki
316.65
55
63.33
2533.2
1266.6
430
71.24
Almatty
754.25
290
150.85
6034
3017
1121
169.70
Gandhisagar
723
320
144.6
5784
2892
1088
162.67
Indirasagar
913
1000
182.6
7304
3652
1571
205.42
Koyna
891
1960
178.2
7128
3564
1858
200.47
Paithan
350
12
70
2800
1400
476
78.75
Rihand
466
300
93.2
3728
1864
732
104.85
Hirakud
743
307
148.6
5944
2972
1111
167.17
Total
7522.5
8738.6
1504.4
60179.6
30089.8
13044
1692.54

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98
Uninterrupted Green Power supply of 13GW can be obtained round the year from the above mentioned reservoirs using
FSPV+PHES & Hydroelectric. The reduction in evaporation loss can be 1692.54 MCM per year in these reservoirs. This
involves installation of around 60 GWp of FSPV & 30GW of PHES capacity.
VIII. ADVANTAGES (2,3,4,5,10,11,17,18,19,20,21,22,30,31,34,36,37,38)
The advantages of FSPV+ PHES with Hydroelectric in India can be listed as follows.
1) It saves the utilisation of precious land resource of minimum 4 acres per MWp needed for ground mounted Solar PV.
2) It converts the intermittent nature of Solar PV power plant output to Uninterrupted Green Power Supply.
3) The output of Solar PV modules improves due to better cooling on reservoir water surface environment.
4) It reduces evaporation water loss in a significant way. For India, which faces a water deficit, this may be a bigger benefit
than the power output, as the demand for water increases in future.
5) The existing infrastructure for power evacuation in hydroelectric power plants can be augmented & used.
6) Mass manufacturing mounting platforms made of potable water grade HDPE can make the FSPV more economical than
ground mounted Solar PV.
7) FSPV faces an environment in reservoir which has less dust compared to ground mounted Solar PV. Also cleaning of
modules is easier with sprinklers. This improves the output.
8) All materials can be recycled
9) FSPV has lower environmental impact as excavation work involved ground mounted plants is avoided.
10) FSPV reduces erosion of reservoir embankments by reducing waves.
11) FSPV can be adapted to any electrical configuration.
12) FSPV is scalable from low to high power generation.
13) In terms of installation speed, FSPV is faster than a rooftop or ground mounted installation.
14) No special tools or heavy equipment is needed for FSPV installation.
15) FSPV can support distributed generation & micro-grids, using local water bodies.
IX. CHALLENGES (2,3,4,5,10,11,14,15,17,18,19,20,21,22)
The challenges for FSPV+ PHES with Hydroelectric in India can be listed as follows –
1) The environmental impact due to shading caused by FSPV needs to be assessed & minimised
2) Proper anchoring will be needed to minimise impact of wind on FSPV.
3) Scheduling for export of power to grid will be needed to accommodate variations in sunshine & rain periods.
4) Water birds be attracted to the project by virtue of its being on water & nests & droppings may cause problems.
5) There may be a risk of power loss in PV modules due to micro cracks caused by vibrations due to wind, waves and external
forces.
6) FSPV may be hampered by factors that affect installation and maintenance: depth of water (water level fluctuation), frozen
region, inflow of floating matters, accessibility, interference by dam facilities (water intake tower, waste-way), etc.
7) FSPV may face legal restrictions such as water source protection area ,Environment Preservation Act, Protection of Wild
Fauna and Flora Act, fishing prohibition area, marine leisure activity
X. POSSIBLE IMPLEMENTATION OPTIONS FOR FUTURE
We may consider the following as some of the options for implementation of the concept in India –
1) The FSPV plants can be undertaken using the process of bidding being currently used for Ground Mounted Solar PV e.g.
Feed in tariff , reverse bidding , viability gap funding etc.
2) The PHES may have to be considered as key asset in National Energy Security Framework with few or no known
alternatives for GW level energy storage. It is best for it to be financed & owned by the Public Sector.
3) A cess with say 25 yrs spread can be considered for Uninterrupted Green Power. PHES is localised & stationary. It does
not face many of the environmental issues of the Hydroelectric Plants related to the river.
4) The Hydroelectric plants existing need to be upgraded to the extent possible, though additional capacity is not an essential
requirement.
XI. ENVIRONMENTAL IMPACT (23,24,25,26,28,29,35)
As the supports for FSPV are made with potable water grade HDPE, the effect on environment is mainly due to shading. The
shading reduces the sunlight reaching the water & prevents growth of algae. Algae are desirable as they use sunlight (through
photosynthesis) to produce carbohydrates and are eaten by grazers such as protozoa and zooplankton (little animals like water
fleas and rotifers). The zooplankton is, in turn, grazed upon by fish, which are eaten by bigger fish, and on up the food chain. A
productive lake produces large fish and good fishing for humans as well as supporting food and habitat for wildlife and
waterfowl. However, nutrient-rich lakes or ponds may support rapid growth of blue-green algae (algae blooms). Blue-green

Uninterrupted Green Power using Floating Solar PV with Pumped Hydro Energy Storage & Hydroelectric in India
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algae with cyanobacteria forming surface scums up to several inches thick. Cyanobacteria are of greater concern as some species
can produce potent toxins. Even if blue-green blooms are not toxic, they are unsightly and when they decompose often produce
bad odours (methane). Shading caused by FSPV may help reduce blue green algae as well as methane release.The reduction in
temperature of water due to shading helps in improving the concentration of dissolved oxygen in water which is desirable for
aquatic life.
XII. CONCLUSION
Uninterrupted Green Power Supply of 13GW round the year can be obtained from the above mentioned reservoirs using
FSPV+PHES & Hydroelectric. The reduction in evaporation loss is expected to be 1692 MCM per year in these reservoirs. This
involves installation of around 60 GWp of FSPV & 30GW of PHES capacity. If coverage of 30% reservoir area is done in place
of 20% considered here & other reservoirs are also utilised, a 50 GW Uninterrupted Green Power Supply round the year can be
aimed at in India using FSPV + PHES with Hydroelectric. Also a reduction in evaporation loss of 5000 MCM per year can be
anticipated. It is likely that with growing demand for water, reduction in evaporation loss is considered a benefit as important as
the power output in future.
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