2. Transmission Policy Decisions
• A very brief description of RETI
– California’s Renewable Energy Transmission
Initiative.
– http://www.energy.ca.gov/reti/index.html
• Good policy decisions need a good
quantitative foundation.
– Historical example – banning atmospheric nuclear
testing.
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3. Conceptual Transmission Planning
• Characterize renewable resource areas;
• Identify potential network additions to existing
system likely needed to access resource areas and
deliver energy to load centers;
• Identify potential environmental conflicts;
• Modify proposed additions;
• Assess renewable and environmental attributes
of proposed additions quantitatively.
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9. Line Segment Assessment
• Criterion A – Total Energy Score
• SegmentScore(j) = SUM [ShiftFactor(j,k) × TotalEnergy(k)]
•
• In which:
• SegmentScore(j) is the jth line segment in the plan;
• ShiftFactor(j,k) is the absolute value of the shift factor for segment(j) and CREZ(k);
• TotalEnergy(k) is the total energy potential of CREZ(k)
• SUM indicates that the all of the results of the multiplication are to be added together.
•
• Similarly:
•
• Criterion B1 – Energy Weighted by Adjusted Economic Score
• SegmentScore(j) = SUM [ShiftFactor(j,k) × TotalEnergy(k) × AdjEconScore(k)]
•
• Criterion B1 – Energy Weighted by Adjusted Environmental Score
• SegmentScore(j) = SUM [ShiftFactor(j,k) × TotalEnergy(k) × AdjEnviroScore(k)]
•
• Criterion C – Energy of Commercial Interest Score
• SegmentScore(j) = SUM [ShiftFactor(j,k) × CommIntEnergy(k)]
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11. Line Segment Groups
Group CREZ Accessed
Foundation all
Tehachapi Tehachapi, Fairmont
Imperial Imperial North A&B; Imperial South; Imperial East; Baja
IronMt Iron Mountain; Pisgah; Needles
BarrenRidge Inyokern, Kramer, Tehachapi, Fairmont
Delivery all
Pisgah Pisgah; Iron Mtn; SB Lucerne
MtPass S. Nevada, Mtn Pass, Baker, Barstow
Riverside Riverside East; Palm Springs; 29 Palms
NorthEast Round Mtn A&B; Lassen N&S; N. Nevada
LEAPS
Inyo Central Nevada, Inyokern, Kramer
North British Columbia, Oregon, Round Mtn
Carrizo Carrizo North, Carrizo South, Cuyama
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12. Segment Environmental Scores
Criterion D – Energy Access Relative to Environmental Concern
Segment Rating Score = Combined Energy Access Score ÷ Environmental Score
Environmental Score =
EnvFactor × LenVal × ROW_Val ×CharVal
Where:
EnvFactor = Value assigned for each type of right of way associated with the line
segment.
LenVal = Value assigned to section according to segment length.
ROW_Val = Value assigned to the segment’s right of way category.
CharVal = Value assigned to the segment’s construction category.
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13. Caveats and Limitations
• Assessment results are preliminary and subject to
change.
• Only renewable energy and environmental
attributes have been assessed.
• Best available data changes with time
– CREZ development potential
• BLM decisions
– Environmental concerns
– Cost estimation
– Uncertainty
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14. Caveats and Limitations – cont.
• Assessment results are preliminary and
subject to change.
• Conceptual plan configuration changes with
time
– Power flow studies
• Limitations of shift factor analysis
– Scenarios
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15. Caveats and Limitations – cont.
• Assessment results are preliminary and
subject to change.
• Assessment methodology can be improved
– Simple summation of line segment energy
information to provide group information can be
improved.
• Scenarios must be examined.
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21. If You Don’t Like the Results…
• Improve ?
– Configuration
– Line segment data
– CREZ data
– Environmental data
– Cost data
– Assessment methodology
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22. Conclusions
• Solar development depends on transmission
decisions.
• Conceptual plan and assessment results
provide a quantitative foundation for these
decisions.
• RETI stakeholder participation is open to all.
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