Active Demand and Energy Storage for RE integration
BSES Case Study.
Rajesh Bansal
Sr Vice President
BSES Rajdhani, Delhi
Workshop IV, date 18th March 2016
BSES Delhi Discoms – A Synopsis
NDPL
BYPL
BRPL
Reliance Infrastructure Ltd. acquired
51% stake in July 2002 in two Discoms
NDMC
MES
For FY 15
Sl No
Particulars
Unit
BRPL
BYPL
BSES
1
Area
sq. km
750
200
950
2
Total Registered Customer
Million
2.1
1.5
3.6
3
Peak Demand **
MW
2,550
1,496
4,046
4
Consumption per Year
BU
11. 8
6.9
18.7
5
Employees
Nos
10,398
6,907
17,305
6
DT + HVDS
Nos
7550+382
3450+90
11000+472
** As on Date
Understanding Distribution Business
To meet “Demand Curve” with Efficiency, Reliability and best consumer services.
Efficiency Means : Lower power cost, AT&C loss & operational cost,
Customer services: Prompt service against request, opportunity to get engage and have required information.
Reliability Means : Power quality and Availability
Load Curve
Under Utilization
Power Shortage
Generation Capacity
Mismatch between demand
and generation capacity
Results in shortage or
surplus supply.
Both Shortage and surplus
supply affect the power
quality, cost and supply
Reliability
Renewable Energy and batteries……. BSES views
Renewable Energy
Battery
• As a responsible utility BSES is also looking for buying
renewable energy.

Device which can be used both as load and source

Can address issue of shortage and supply.

Both Battery and renewable can be near load ….
Saving on infrastructure.

Inverter can be use to address issue of reactive
drawl, harmonics, load balancing.

Incidentally cost of batteries are high … comparable
with conventional generation plant.
• BSES has promoted Roof TOP Solar and is pioneer in NET
METER SOLAR CONNECTION.
• Incidentally Renewable like solar and wind are
unpredictable.
• If Renewable Energy share will be more, then
 Both generation and demand will be uncertain.
 More incidence of shortage and surplus
 Will affect cost, quality and Reliability.
BSES Business case ….
Battery can address issue related to mismatch caused due to un-certain created by
renewable energy.
Delhi, The Capital city, generate only 15~20% of energy it need. The percentage will further go down.
Pollution is big issue in Delhi. Present peak demand 6000 MW.
Delhi solar target is 2800 MW.
Occasional power outage become critical for many consumers.
A battery base solution can be designed keeping in view enablers and concerns.
BSES --- An opportunity for battery base solution Providers.
Sharing Data and facts for Planning
6
Load Duration Curve - BRPL
Curve has been plotted on the 15 minutes duration cycle
of whole year i.e. 35040 values
Only 115 hours load remains above 2200 MW in a
year
Only 46 hours in a year load remains above 2300
MW.
Concern : Capex requirement which remain highly under utilised.
Impact on cost and quality of Power.
Demand Pattern-BRPL
Peak in winter during
8:00 pm to 11:00 pm
Peak in summer during
15:00 pm to 16:00 pm
2nd peak occurs during 23:00 to
00:00
High ratio of peak
& non-peak
Feed In tariff varies every 15 minutes and varies a lot.
An opportunity to control Power cost
DISCOM Energy Flow
66/33/11 kV Bus
M1
M2
66/33 kV Bus
TRL meter
TRL feeders
Input Energy: TRL Bills
Grid Incoming meter
66/33kV Grids :SCADA
EHV Grid
(66/33/11 kV)
EHV Consumer
EHV & HT consumer
Consumer sale data: SAP billing
11 kV Bus
M3
11 kV meter
HT Consumer
BRPL11kV feeders / Division energy
HT Input energy: Remote Meter Reading
Technical loss 3%
DT/HVDS
(11/0.415 kV)
0.415 kV Bus
DT/HVDS
meter
DT Substations / Sub-cluster energy
DT Input energy: DT meters
M4
Technical loss 3~4%
M5
Consumer Meter
Consumer meters
Sale data: SAP Billing
9
Growth In Solar Energy …………
For Many consumers Roof TOP Solar power cost lower than Utility power
Roof top solar address late afternoon peak i.e. 3:00 to 4:00
Consumer with TOD based tariff pay high for summer afternoon energy
consumption.
Delhi has Net metering Policy --- BSES has large Nos of Net meter connections
Govt Of Delhi is planning subsidy and /or Generation based incentive .
Delhi will see a large growth of Solar installation.
10
Distribution constraints …….
 Many area is seeing vertical Growth
 Land is costly
 Demand is going UP.
 No space to put infrastructure
Distributed Generation , addressing peak by battery can be a major solution.
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Electricity Consumers………….
 Many Consumers have battery
For back up supply.
 If we total it up …. Very large
 Used only if outage … underutilization.
A system need to be designed to use available batteries also.
12
What about Distributed Battery bank(s)….
Ideal locations can be identified as info available on GIS.
GRIDS
HTC
DT
DT
DT
ICT TOWER
ICT TOWER
GRIDS
BRPL BUILDINGS
HT CONSUMER
The requirement of BRPL alone will > 50 location and around 100 MWHr.
Battery Bank …… large type
Preferred location … BSES Grids
Purpose:
Peak control
Sync – Generation with demand
De-stress congested area Network.
Reduce technical loss in Network
Assured supply to critical consumers
 a Tool for power cost management
Typical capacity 1~2 MWHr , fast charge discharge capability
14
Portable Batteries Bank ……
 A bank of portable batteries.
Purpose:
 To bring stability to grid.
On need basis can be used as portable power
source.
Batteries for vehicles.
A concept to integrate available portable batteries and have better utilization of same.
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Conclusions ….
Technology success depends upon its acceptability.
Unless financial Viable – its Acceptability will be limited.
Delhi is seeing big changes in term of generation profile, load profile and consumer expectations.
Battery address many of utility, Government and consumer concern and expectation. It will become
popular . Question is when ??
BSES is exploring how best this can be used, inorder to prepare for future.
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“THANK YOU”