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Demand Response: Moving from a



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A.Ipakchi Grid of the Future

Demand Response: Moving from a 

Load-Following to Load-Shaping Strategy

Load management has been around since the early 1980s. 

Direct load control, peak shaving, peak shifting, and various 

voluntary load management programs have been  implemented 

by many utilities with varying degrees of success. Now, with 

the push for energy conservation and demand-side manage-

ment as a key strategy for environmental compliance, DR is 

taking on new realities. In addition to traditional load man-

agement, the advanced metering infrastructures (AMIs) be-

ing deployed by many utilities around the country will enable 

the implementation of targeted dynamic tariffs, management 

of demand-side energy resources, and integration of retail de-

mand-side capabilities with wholesale energy markets. Many 

expect that dynamic and market-based rates will become the 

default retail tariff in many regions with AMI capability.  

Initiatives, such as NIST/Gridwise Architecture Coun-

cil efforts to defi ne Home-to-Grid (H2G), Building-to-Grid 

(B2G), and Industry-to-Grid (I2G) interoperability require-

ments,  as  well  as  International  Electrotechnical  Commis-

sion (IEC) standards for home area networks (HANs), will 

enable the integration of demand-side resources with distri-

bution and, in the aggregated form, with transmission op-

erations. The end-use devices, such as intelligent  appliances 

and smart chargers, will have visibility of possible distribu-

tion grid conditions (congestion) and dynamic prices, and 

they  will  be  able  to  make  local  decisions  to  control  their 

consumption. The system operator will be able to moni-

tor and, either directly or through price signals, manage 

demand. The grid will be ready 

to move from the traditional load-

following operating strategy to a 

load-shaping strategy, in which 

demand-side resources are man-

aged to meet the available genera-

tion and the grid’s power delivery 

capabilities at any time. 

FERC Order 719 directs ISOs 

and RTOs to remove some of the 

barriers to demand-side participa-

tion in the ancillary service mar-

kets. Yet, the information infra-

structure needed to make this a 

reality is lacking. Furthermore, the 

existing rate structures and market 

tariffs will need to be modifi ed to 

Charging MWh/h Needed 

0.1

1

10



100

100


Number of PHEVs

MWh / hr (Logarithmic Scale)

250

1,000


5,000

Level I—Single Phase

Level III—Three Phase


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