January 2014 |
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Moving beyond Demand Response: Energy Interoperation |
Toby Considine |
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Every smart energy plan acknowledges that DR is a short-lived
transition strategy. It is fundamentally uneconomic. It addresses only
power, and ignores most sources of grid instability. It ignores the
physical limits on distribution. It does not acknowledge distributed
energy resources.
Consumer power markets use an inefficient model made stranger by Demand
Response. Consider today’s power markets as a buffet, where the price
is only calculated by weight as you leave. The ingredients may be rare
or common, but the price by weight is the same; unsophisticated diners
pay the same price for less. The proprietor keeps a close watch on the
ingredients and occasionally pays customers not to take too much from
certain bowls.
We would recognize this as a strange market. The economic value of
power changes over the day, market supply and demand change by the
minute, but the power is not priced accordingly. Consumers pay based on
bulk metering at the end of the month. Demand response sometimes makes
out-of-market deals with the more sophisticated consumers. We use this
odd market because utilities do not have customers, they have load.
As the operating margin on grids are reduced, the economic cost of
non-load characteristics grows. Variability of load is more expensive
and predictability of load becomes more valuable. A single node with an
unbalanced power factor causes more problems to other nodes on the same
circuit. The value of a node that not only maintains a good volt-var,
but can compensate for adjacent nodes is greater.
With variable loads and storage, variable prices can influence the
aggregate load of a set of nodes to one larger than the local circuits
can sustain; local capacity markets, even single transformer capacity
markets, may be essential to minimize capital costs and improve
stability.
Demand Response is a strategy to reduce capital costs by avoiding the
need for new generating capacity. It works in parallel with and
reinforces reductions in operating margin. At a reduced operating
margin, all ancillary services become more valuable, and more local. As
market mechanisms for allocating grid resources and services over time
become more automated and standard, the scope of what is so allocatable
extends down to smaller and smaller assets. Such assets may be less
expensive, but there are many more of them, and the aggregate savings
may be larger even than those achieved by avoiding a large peaker
generating plant.
This is the problem set of OASIS Energy Interoperation. The event-based
interactions of OpenADR are a critical but small part of the whole. The
messages and interactions in OpenADR 2.0 are consistent with those used
throughout Energy Interoperation; experience coding for OpenADR 2.0 is
experience coding for all of Energy Interoperation.
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The short term economic opportunity for smart energy in buildings is in
the profiles developed by the OpenADR alliance. Profile A is similar to
the older OpenADR 1.0 and there are few barriers to rapid
implementation of this open specification. In the mid-term, the models
of Profile A will be unable to keep up with the growing complexity of
distributed energy resources. Programmers used to parsing Profile A
messages will be ready to start using Profile B. A critical barrier
will be the initial lack of VENs able to handle service oriented energy.
With the growth of distributed energy, we must anticipate a model in
which there are multiple source of energy, and multiple flows of
energy, in multiple directions. Capacity markets for major nodes and
local systems may be more valuable than for simple power. Under this
model, all shortages are local, all surpluses are local, and all prices
must be local.
Service oriented energy foresees very small markets that cost almost
nothing to implement. Structured energy also foresees that these
markets may operate independently of the larger markets, based on local
energy sources and local capacity. It is an interesting question
whether the algorithms developed today for OpenADR Profile B can become
standard enough and small enough to be implemented in ASICS, and
incorporated into nano-markets for devices, which are then able to
operate nano-grids through transactions.
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