Regulatory developments and impacts involving electricity storage in texas
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Regulatory Developments and Impacts Involving Electricity Storage in Texas. Elizabeth Drews 31 st USAEE/IAEE North American Conference Austin TX, November 4-7, 2012. The usual disclaimers. This is not legal advice or legal services This is no one’s opinion but mine, & might not stay mine

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Regulatory Developments and Impacts Involving Electricity Storage in Texas

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Regulatory Developments

and Impacts

Involving Electricity Storage in Texas

Elizabeth Drews

31st USAEE/IAEE North American Conference

Austin TX, November 4-7, 2012


The usual disclaimers

  • This is not legal advice or legal services

  • This is no one’s opinion but mine, & might not stay mine

  • This is a summary

  • Laws & facts change


Why storage could especially benefit ERCOT

  • ERCOT’s

  • Electrical isolation from other grids

  • > 11,000 MW wind (# 1 in US, # 6 in world, > 2,000 MW coastal) 12,277 MW by 2014

  • Growing demand

  • Potential capacity shortfalls

  • Nodal market design

3


Where would storage fit in ERCOT?Capacity, Demand, Reserves Report (May 2012)


Generation under study in ERCOT *

Peak demand

68,379 MW

Wind record

8,368 MW (17.64% of 47,452 MW load) of which 7,381 non-coastal

* No firm commitment to build

+ Calculated at 8.7% of nameplate capacity


Some IPP storage development in Texas

Source: filings in Public Utility Commission of Texas (PUCT) Projects 39764, 39917, 41026


Some uses of electricity storage

  • Energy time-shift

  • Peak shave

  • Ancillary services

  • Reliable power in outage

  • Address voltage, frequency variations

  • Transmission support

  • ↓ transmission congestion

  • Defer T&D upgrades

7

Adapted from PUCT 2011 Scope of Competition Report


Generalized attributes of storage technologies

Must be near cavern or similar, TX has

Attributes/capabilities vary by project & technologies are evolving

8


Regulatory limits on uses of ERCOT storage

  • In non-retail choice areas, utility, coop, muni can own G&T

  • Can own storage that serves both functions

  • In retail choice areas, utility owns T&D, power generation company owns generation

  • Protects competition

  • Keeps storage from supplying & being paid for all its uses

9


Storage as transmission

  • PUCT Docket 35994, ETT

  • Transmission/distribution utility owns 4 MW battery to help voltage & delay transmission in remote area, does not own or sell energy from the battery

  • PUC: transmission asset, can put in rate base

  • Operational since 2010

10


Storage as generation

  • 2011 statute (SB 943) – Texas storage:

  • Intended to sell energy or ancillary services at wholesale is generation

  • May interconnect, obtain transmission service, sell electric energy & ancillary services at wholesale consistent w/ TX law re: power generation company or EWG

  • Must register as power

  • generation company

11


PUCT pricing rule on storage(2012, Project 39917) 3 main decisions

  • Electricity purchases by storage for charging are wholesale, not retail (same as FERC)

  • Such electricity purchases are settlednodally (at bus that connects the storage facility), not zonally like a load

  • Retail transmission&ancillary service charges do not apply to such electricity purchases

12


ERCOT rule changes, integration issues

  • ERCOT’s Emerging Technologies Working Group

  • IDs & proposes changes to ERCOT requirements that preclude market participation of emerging technologies

  • Has addressed # issues relating to storage

  • Is developing a list of operations issues relating to storage

13


PUCT ERCOT pilot project rule(2012, Project 40150)

  • Allows ERCOT pilot projects for storage/other ET

  • ERCOT may temporarily exempt pilot participants from specific ERCOT requirements

  • ERCOT board must approve pilot project; board decision appealable to PUCT

  • Rule leaves many issues, e.g. cost allocation & post-pilot transition if any, to ERCOT pilot review process to resolve

14


Pilot projects at ERCOT

  • ERCOT posts documents for each pilot project on its website

  • ERCOT has been working on a pilot project for a Fast Responding Regulation Service (similar to FERC Order 755, “pay for performance”)

15


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