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

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

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

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

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


Generation under study in ercot

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

Some IPP storage development in Texas

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


Some uses of electricity storage

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

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

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

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

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

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 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

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

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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