Public Discussion—SDCP-- April 21, 2023
• Strategic Planning Meeting Comments
• Agenda item, DER Plan
• Agenda Item, Plan Modifications
Dave Peterson
San Diego Resident
[email protected]
Add a Study to the DER Plan: MUD EV charging
• 46% of San Diego householders live in Multi-Unit Domiciles (MUDs) • Grid provides household power, MUD roof area is insufficient • Most older MUDs have no EV charge stations
• So , most San Diego MUD dwellers will not buy EV’s
• SDG&E’s Power Your Drive (PYD) MUD ports cost $23k (2019 Avg) Averaged 25 MUD sites per year (2016-2019), 10 ports per site • The 2019 PYD charge port capacity factor was 0.03 (3040 ports) • For 20XX: Find a way to get HOA Board/apartment owner financing to add solar roofs for MUD outside lights, pool, laundry and 2 to 6 charge ports
4/21/2023
2 Add a Study to Modify the Plan:
Use of Repurposed EV Battery Modules
• The use of retired, repurposed EV battery modules has been proposed to reduce Hybrid farm battery cost
• Goal: Extend EV battery module life another 10 years? • If the saving are sufficient, PPA procurement of Hybrid batteries without subsidies might be feasible (A Long Shot)
• Study partners should include Arevon and, most importantly, Tesla • Include a few Demonstration Modules (from collisions?) in a Vikings Megapack? • Clarify the strategy for using repurposed modules in Hybrid farms • Enhances the chance of meeting the SDCP 2035 goal
• https://calepa.ca.gov/wp-content/uploads/sites/6/2022/05/2022_AB- 2832_Lithium-Ion-Car-Battery-Recycling-Advisory-Goup-Final-Report.pdf 04/21/2023 3
Add a Study to Modify the Plan:
Reduce Geothermal Risk
• Geothermal electricity production would be desirable for the 20xx plan • Don’t know yet whether repurposing EV batteries is going to be viable • History-ORMAT’s Brawley Complex • In 2012,—Corrosive brine and insoluble solids caused injection pump failures • Original PPA was for 50 MW, Currently producing 7 MW, • Ormat took a $200M charge against earnings
• Fund ORMAT to further “Study” the Brawley problem. Study would:
• Purge the corrosive reservoir portions with freshwater to reduce insoluble solids • Support well drilling if needed
• Continue the purge until acceptable brine quality and required flow are achieved • Dispose of the sludge!! Next Slide
• 50 MW times 24 hours/day =1200 MWh- Equivalent to Two (2) Vikings • Not an option if there is a risk to existing 7 MW SCE production, 2031 PPA, find another reservoir 4/21/2023 4
Sludge Disposal
• First store the sludge in a catch basin
• Compact it through evaporation
• Send it to Nevada in barrels to the nuclear waste site? Probably not • Instead of Nevada, transport and pump it back underground into a geothermal reservoir that is already thermally depleted • There would be no requirement for continuous operation • Find a pump that only breaks down once-in-a-while
• Get it all planned and approved beforehand
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