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Public policy-driven transmission planning

Sushant Barave

California ISO

June 20, 2018

Anchor Data Set (ADS) Webinar

California ISO Public

Create demand forecast & assess resource needs

CEC &

CPUC

With input from

ISO, IOUs & other

stakeholders

Creates transmission planISO

With input from CEC,

CPUC, IOUs & other

stakeholdersCreates procurement

planCPUC

1

2

3

fee

d in

to

With input from CEC,

ISO, IOUs & other

stakeholders

4

IOUs

Final plan authorizes procurement

Results of 2-3-4 feed into next biennial cycle

fee

d in

to

Overview of the planning and procurement process


Alignment of key infrastructure planning processes by CPUC, CEC and

CAISO staff*

• The CPUC develops an

assumptions and scenario (A&S)

document through a public

process.

• This document is the vehicle for

incorporating California’s public

policy into CAISO TPP

• The accompanying diagram

shows the IEPR-LTPP-TPP

alignment which has seen minor

changes over the years as a

continuously evolving process.

* http://www.caiso.com/Documents/TPP-LTPP-IEPR_AlignmentExplanatoryText.pdf

http://www.caiso.com/Documents/TPP-LTPP-IEPR_AlignmentExplanatoryText.pdf


CAISO Transmission Planning Process (TPP)

March 2019April 2018January 2018

• State and federal policy

• California Energy

Commission (CEC) -

Demand forecasts

• California PUC - Resource

forecasts and common

assumptions with

procurement processes

• Other issues or concerns

Phase 1 – Develop

detailed study planPhase 2 - Sequential

technical studies

• Reliability analysis

• Policy-driven analysis

• Economic analysis

Publish comprehensive

transmission plan with

recommended projects

ISO Board for approval

of transmission plan

Phase 3

Procurement


Policy transmission evaluation aims to meet the policy directives while

minimizing stranded investments

• CAISO tariff section 24.4.6.6 -http://www.caiso.com/Documents/Section24_ComprehensiveTransmissionPlanningProcess_asof_Sep27_2017.pdf

• Transmission solutions needed to meet state, municipal, county or federal

policy requirements or directives.

• Category 1 or Category 2

Category 1 – found to be needed and are recommended for approval as part of the

comprehensive Transmission Plan

Category 2 – could be needed to achieve state, municipal, county or federal policy

requirements or directives but have not been found to be needed in the current planning cycle

http://www.caiso.com/Documents/Section24_ComprehensiveTransmissionPlanningProcess_asof_Sep27_2017.pdf


State policy input is received from the CPUC in the form of resource

portfolios

• RPS portfolios reflect the state renewable policy goals

• Provide a projection of where renewable resources are expected to develop

to meet the state’s RPS

• The CAISO Board approves the transmission projects for cost allocation,

including projects to support public policy, with the understanding that state

agencies support the intent

• Transmission developers then apply to the CPUC for siting justifying their

projects as interconnecting the RPS portfolios that the CPUC provided to the

CAISO


Renewable policy-driven assessment is an iterative process that feeds

back into renewable portfolio creation

Renewable Portfolios

Resource Mapping

Production Cost Simulation

Power flow base cases

Renewable curtailment and congestion

information

Generation dispatch and

path flow information

Transmission constraint information

Reliability Studies

Deliverability Assessment

CPUC’s RPS calculator has been

replaced by RESOLVE model in

the integrated resource plan (IRP)

to create renewable portfolios.

CEC staff worked with the ISO to

recommend specific buses for

modeling generic portfolio resources.


Policy-driven transmission and FERC Order 1000

• FERC Order 1000 is comprised of regional planning and interregional coordination

components

• Public policy-driven transmission planning framework was incorporated into the CAISO’s

tariff before FERC Order 1000 (main driver was California’s 33% RPS)

• For the CAISO, FERC Order 1000 resulted in addition of competitive solicitation in its

regional planning and interregional coordination with other planning regions

• Public policies that have had the most significant impact on transmission planning are

– SB2(1x)

– SB350

– AB1318

California's Renewables Portfolio Standard (RPS) was established in 2002 under Senate Bill 1078, accelerated in 2006 under Senate Bill 107, expanded in 2011 under Senate Bill 2(1x), and enhanced in 2015 by Senate Bill 350.

Retirement of once-through cooling generation; this policy is reflected in reliability analysis instead of policy-driven analysis.


CAISO’s experience with FERC order 1000 and policy-driven transmission

evaluation

Regional projects approved in order to meet public-policy needs

Regional selections completed through competitive solicitation

Interregional transmission project proposals*

1. Suncrest 300 MVAR dynamic reactive device2. Lugo – Mohave series capacitor upgrade3. Sycamore – Penasquitos 230 kV line4. Lugo – Eldorado 500 kV line re-route5. Lugo – Eldorado series capacitor and terminal equipment upgrade6. Warnerville – Bellota 230 kV line reconductoring7. Wilson – Le Grand 115 kV line reconductoring

1. Imperial Valley area collector station2. Gregg – Gates 230 kV transmission line3. Sycamore – Penasquitos 230 kV transmission line4. Miguel and Suncrest dynamic reactive support5. Estrella, Spring and Wheeler Ridge substations6. Delaney – Colorado River 500 kV transmission line7. Harry Allen – Eldorado 500 kV transmission line

1. TransWest Express (TWE)2. Cross-tie Transmission Line3. SWIP-North4. Desert Tortoise Expressway HVDC Conversion

*Mostly aimed at delivering wind resources from Wyoming and New Mexico into California


Transmission underway to meet 33% RPS in 2020

Transmission upgradeApproval status

OnlineISO CPUC

1 Carrizo-Midway LGIA NOC effective Energized

2Sunrise Powerlink Approved Approved Energized

Suncrest dynamic reactive Approved Pending 2019

3 Eldorado-Ivanpah LGIA Approved Energized

4 Valley-Colorado River Approved Approved Energized

5 West of Devers LGIA Pending 2021

6Tehachapi (segments 1, 2

& 3a of 11 completed)Approved Approved Energized

7 Cool Water-Lugo LGIA Pending 2018

8 Path 42 reconductoring Approved Not needed 2016

9 Sycamore-Penasquitos Approved Not yet filed 2018

10 Lugo-Eldorado line reroute Approved Not yet filed 2018

11Lugo-Eldorado and Lugo-

Mohave series capsApproved Not needed 2020

12 Warnerville-Bellota recond. Approved Not yet filed 2017

13 Wilson-Le Grand recond Approved Not yet filed 2020

$6.5 B

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