Experience of NTPC

Setting up Large scale Solar-Wind

Hybrid Project

22/11/2017 Presented by : Mr. N.S.P. Singh

AGM, PE-Wind

NTPC

NTPC at a glance

The total installed capacity of the company is 51,708 MW { 29 coal based (including JV), 7 gas based stations

1 Hydro based station

1 Wind based station

11 Solar PV projects. }

Projects under implementation including JV and subsidiaries in

total are about 19,654 MW, and the long term corporate plan is

to be a 130 GW company by 2032.

We envision a diversified fuel mix and are committed to attain

nearly 30% generation capacity from non-fossil fuel resources by

year 2032 in turn lowering carbon footprint by reducing GHG

emissions.

Moving Towards Renewable Energy

Adapting innovative technologies for blending thermal power with wind & solar energy generation

Supporting factors:

• Remotely located – Higher Land availability

• Existing power evacuation facility

• Capability to invest in larger CAPEX projects

Case Study: USAID PACE-D Program provided Technical Assistance in drafting Detailed Feasibility Report and Bid document

“NTPC’s Wind-Solar hybrid project (252 MW )”

Advantages of Wind-Solar Hybrid

Increased output

(MWh)/km2

Savings on Evacuation

System Costs

More balanced

power mix for sale

Reduced ‘OPEX’ due to shared services

Wind-Solar Hybrid: Basic Design Approach

1 • Maximize Wind Generation in the Given Area

2 • Leave space around WTG before placing solar (Shadow Analysis)

3 • Optimize Solar Capacity for high Generation, low

Cost (DC:AC ratio, pitch angle)

4 • Optimize AC system to Pooling Station

5 • Design Common Services and Facilities

Wind-Solar Hybrid: A Typical Hybrid Block

PVsyst Analysis: Solar Module Placement Approach Approach

140 Meters square area was kept empty

Near shading loss = 1.6%, which is just

0.2% greater than 171 meters

Solar capacity = 178 MW AC

Energy generation = 378,868 MWh per

annum.

171 meters Radius area was kept empty

Near shading loss = 1.4%

Capacity= 89 MW AC

Energy generation = 190,050 MWh per

annum.

It clearly shows a potential to pack solar capacity by choosing to leave just

the operating space, depending on the land availability and the goals for

balancing generation.

Comparative study

NTPC Kudgi: Project site for Wind-Solar Hybrid

Site Characteristics

Site Location NTPC Kudgi, Bijapur, Karnataka

Site Co-ordinates 16.15 degrees North and 75.84

degrees East

Terrain Type Simple/Plain Terrain having

power plant structures

Contiguous/ Non-contiguous

land Non-Contiguous

Water Bodies -Nil- (Within the periphery)

Obstacles Power plant chimney & other

associated structures

Elevation (m.a.s.l) 488-587m

Wind Direction Predominantly West

Distance of built-up structures Within the periphery

Nearby WTGs of OEMs No other wind farm exists in the

vicinity

NTPC Kudgi: Wind Micrositing

Wind farm

Capacity (MW) 60

No. of WTGs 30

Proposed WTG

Rating (MW) 2.0

Proposed WTG

locations

NTPC Kudgi: Solar PV Layout

NTPC Kudgi: Solar PV selected Case Analysis

Total Generation

AC:DC ratio 1:1.35

Tilt Angle (Degree) 10

Pitch (m) 7.5

Installed Capacity MWp

DC 259.2

Installed Capacity MW

AC 192

Total Gen (GWh/Yr) 358.7

Parameters Values

AC to DC ratio 1:1.35

PV module 320 Wp

Installed capacity (kWp) DC 8102

Installed capacity AC (kW) 6000

Module efficiency at STC (%) 16.67%

Capacity Utilization Factor (CUF) at P75 18.20%

Solar Resource For fixed tilt

angle 10o

Effective global irradiance incident on

collector plane (kWh/m2) 1933.7

First Year Energy Output at Inverter

Output (MWh/annum) 13570

Specific energy production

(kWh/kWp/year) 1640

Performance Ratio 79.57%

PVsyst output AC:DC ratio of 1:1.35

Final hybrid capacity mix

The total capacity of solar-wind hybrid project is 252 MW

leading to AEP of 603.32 GWh per year.

Estimated tariff for Hybrid project

Tariff (INR / kWh)

Without Land

Cost

With Land

Cost

Solar 3.44 4.56

Wind 3.06 3.57

Overall LCOE 3.32 4.25

Cost Saving due to shared Infrastructure

•There will be no extra cost to develop high voltage power evacuation

infrastructure for the wind power project.

•Capital cost savings on other infrastructure such as roads, security,

plant control, spares warehousing, energy storage; forecasting and

scheduling.

International Competitive

Bidding to be conducted

Tender will be issued for LSTK

(Lump sum Turnkey) EPC

contractor, for the entire plant

up to Pooling SS

Bidders to quote for EPC + 10

Years OMS contract.

Consortium Allowed

NTPC Kudgi: Wind-Solar Hybrid Bidding Approach

Evaluation Criteria V = (EPC Contract Value with taxes + PV of 10

yrs of O&M Expenses)/(KWh generated over 10

years)

The lowest V would be the winner

The forecast generation figures would become the basis

for Performance Guarantees (peak capacity, performance

ratio, power curve tests, plant availability, degradation

etc.)

1. Power Sale- Recognition of Large Consumer to purchase

power.

2. Metering – Metering to be done independently for wind

and solar/ combined Metering. Discom discussions to

take place

3. Regulation – The Policies which setup directives are in

draft stage and expected to be finalized before the project

gets implemented.

Resolution of issues such as RPO fulfillment, Long Term Transmission capacity allocation, Metering, Scheduling and

Forecasting etc. would likely be clarified.

Issues requiring further work

Some Pictures from Site Visit

THANK YOU