Phil and David,
Yes, storage can play a
big role in providing ancillary services and supporting the integration of wind
and solar. I am a big advocate of
distributed storage in very large amounts (see my attached editorial on the
subject which has led to pending legislation to promote storage in
California). Also see my storage
company's website (www.megawattsf.com) below on this subject.
Both of you raise the
issue of what is behind the meters including storage. After thinking about this problem for some
time, I think it is too difficult to communicate what is physically behind the
meters. We would need to know the state of
charge of storage devices, the charge/discharge
efficiencies and nonlinearities of each type of battery, battery temperature
that can limit use, and the opportunity
costs of storage use. In some case what
is behind the meter changes such as when an electric vehicle is plugged in, a storage battery is added or removed for
maintenance and so on. And sometimes the
storage may be ice storage which is useful when there is an air conditioning
load and less useful when there is not air conditioning load. And as David
said, each storage device needs new XML.
The other approach is
Transactional Energy, wherein the priced offers and transactions over current
and forward intervals using frequent, small transactions can fully convey all
of the necessary transactional information on what is behind the meter
including any storage with no specifics on the devices or their state and no
special XML. And with forward priced
offers that form a forward price curve, automated self-dispatch of storage is much easier to do.
Ed
Edward G. Cazalet, Ph.D.
Vice President and Co-Founder
MegaWatt Storage Farms, Inc.
101 First Street, Suite 552
Los Altos, CA 94022
650-949-5274
cell: 408-621-2772
ed@MegaWattSF.com
www.MegaWattSF.com
From: David RR Webber (XML) [mailto:david@drrw.info]
Sent: Monday, April 26, 2010 8:42 AM
To: Phil Davis
Cc: emix@lists.oasis-open.org; Toby.Considine@gmail.com
Subject: RE: [emix] Power storage strategies
Can we get one of those
400 people to write some XML for us?!?!
If telephone switch
industry is a guide here - this means we already have 3 sets of battery
subsystem XML - GE, Hitachi and Samsung - with more to follow. And of
course each new model has new XML...
-------- Original Message --------
Subject: RE: [emix] Power storage strategies
From: "Phil Davis" <pddcoo@gmail.com>
Date: Mon, April 26, 2010 11:26 am
To: "'David RR Webber (XML)'" <david@drrw.info>,
<Toby.Considine@gmail.com>
Cc: <emix@lists.oasis-open.org>
Actually, GE announced
such a system last week and is hiring 400 people in Atlanta to staff the new
business. It's a substation level product. Also, I have spoken personally
with people at Hitachi and Samsung who are testing a 1 MW battery. Such a
battery from another vendor is in test operation behind PJM's main offices. So
local here takes on a new meaning depending on whether it is truly behind the
customer meter, or behind the distribution grid meters (substations and the
like), or on a transmission system. Theoretically, batteries of this size
could replace generators used for voltage or frequency support.
From: David RR Webber (XML) [mailto:david@drrw.info]
Sent: Monday, April 26, 2010 10:58 AM
To: Toby.Considine@gmail.com
Cc: emix@lists.oasis-open.org
Subject: [emix] Power storage strategies
It occurs to me that
local storage can potentially play a role here - depending on its efficiency of
course. One can anticipate that future technology will offer higher %
there - especially if market forces drive that equation.
Therefore - a future system
could offset power surges by drawing on locally stored resources that were
captured during off-peak or excess capacity. In fact such a system may
notify suppliers that they can "push" excess power to local storage
at some pre-determined cost point - and of course also need to indicate that
the storage facility is at a certain % level, or if empty - accept units at a
higher cost rate.
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