Poseidon Carlsbad: Desalination and the San Diego County Water Authority Custom Case Solution & Analysis

Evidence Brief

Financial Metrics

• Total Project Capital Cost: 1 billion dollars for the desalination plant and associated infrastructure.
• Water Purchase Agreement Term: 30 years of guaranteed payments.
• Unit Cost: Desalinated water priced between 2014 dollars and 2257 dollars per acre-foot.
• Comparative Cost: Imported water from Metropolitan Water District priced at approximately 1000 dollars per acre-foot.
• Production Capacity: 50 million gallons per day, totaling approximately 56000 acre-feet per year.
• Supply Contribution: The plant provides 7 percent of the total water supply for San Diego County.

Operational Facts

• Technology: Reverse osmosis membrane filtration located adjacent to the Encina Power Station.
• Infrastructure Requirements: A 10-mile large-diameter pipeline required to transport water to the regional delivery system.
• Energy Intensity: Desalination requires significantly more electricity than transporting water from Northern California or the Colorado River.
• Location: Carlsbad, California, utilizing existing cooling water discharge infrastructure from a power plant.

Stakeholder Positions

• San Diego County Water Authority: Seeks supply reliability and independence from the Metropolitan Water District.
• Poseidon Resources: Private developer seeking a guaranteed revenue stream via a take-or-pay contract structure.
• Metropolitan Water District: Regional wholesaler that currently provides the majority of water to San Diego.
• Environmental Groups: Surfrider Foundation and San Diego Coastkeeper oppose the project due to brine discharge and marine life impingement.

Information Gaps

• Precise energy price escalation formulas within the 30-year contract.
• Detailed breakdown of decommissioning costs after the 30-year term.
• Actual elasticity of consumer demand if water rates increase by the projected 5 to 7 dollars per month per household.

Strategic Analysis

Core Strategic Question

• Should the San Diego County Water Authority commit to a high-cost, long-term local water source to mitigate the risks of imported water volatility and supplier dependency?

Structural Analysis

The power of the primary supplier, Metropolitan Water District, is the dominant structural force. San Diego is at the end of the pipeline for both the State Water Project and the Colorado River. This geographic position creates extreme vulnerability to supply disruptions from drought or regulatory changes in the Sacramento-San Joaquin Delta. The bargaining power of buyers is low because water is an essential commodity with few immediate substitutes at scale. Desalination serves as a backward integration strategy to reduce supplier power, even if the marginal cost exceeds current market rates.

Strategic Options

Option 1: Execute the 30-Year Water Purchase Agreement. This provides immediate supply certainty and protects against future imported water price spikes. The trade-off is a long-term commitment to a high-cost fixed asset and potential technological obsolescence.

Option 2: Aggressive Conservation and Indirect Potable Reuse. Focus capital on wastewater recycling and demand management. This is likely cheaper than desalination but carries higher public perception hurdles regarding the use of recycled water for drinking.

Option 3: Maintain Status Quo with Increased Storage. Rely on existing suppliers while building more local reservoirs. This avoids high capital expenditure but fails to address the underlying scarcity of the raw water supply.

Preliminary Recommendation

The Authority should proceed with the Poseidon Carlsbad project. Reliability is not a financial metric but a requirement for regional economic stability. The price premium for desalinated water functions as an insurance premium against the catastrophic costs of a water shortage that would cripple the regional economy.

Implementation Roadmap

Critical Path

• Finalize the 734 million dollar tax-exempt bond issuance to secure project financing.
• Secure the final permits from the California Coastal Commission regarding intake technology and brine discharge mitigation.
• Commence construction of the 10-mile pipeline link to the Twin Oaks Valley Water Treatment Plant.
• Execute a multi-year public communication plan to justify rate increases to the 3.1 million residents of the county.

Key Constraints

• Energy Price Volatility: The operational cost of reverse osmosis is highly sensitive to electricity rates. Any spike in power costs will expand the price gap between desalinated and imported water.
• Regulatory Compliance: Stringent California environmental laws regarding marine life protection may require expensive mid-contract retrofits to intake systems.

Risk-Adjusted Implementation Strategy

The implementation must include a phased rate integration plan. Rather than a single price jump, the Authority should phase in the costs over the construction period. A contingency fund must be established to cover potential litigation costs from environmental groups that may attempt to stall the pipeline construction. Success depends on the ability to maintain the take-or-pay agreement integrity if imported water prices temporarily drop due to wet weather cycles.

Executive Review and BLUF

BLUF

Approve the Poseidon Carlsbad desalination project immediately. San Diego faces a structural supply deficit that endangers its 188 billion dollar regional economy. While the 100 percent price premium over imported water is significant, it is a necessary cost for diversification. The project secures 7 percent of the regional needs from a drought-proof source, reducing the influence of the Metropolitan Water District. This is a strategic move from a position of vulnerability to one of relative water sovereignty. The contract structure appropriately shifts construction and operational risk to the private partner while the Authority retains the supply benefit.

Dangerous Assumption

The most dangerous assumption is that the price of imported water will continue to rise at historical rates. If the Metropolitan Water District stabilizes its pricing or if new state-level water infrastructure reduces imported costs, the Authority will be locked into an uncompetitive, high-cost contract for three decades with no exit path.

Unaddressed Risks

Unconsidered Alternative

The analysis overlooks a regional water-sharing partnership with Mexico. A cross-border desalination plant in Rosarito, Baja California, could potentially offer lower labor and land costs while providing similar supply benefits to the San Diego basin. This path would avoid some California regulatory hurdles but introduce significant geopolitical and sovereign risk.

Verdict

APPROVED FOR LEADERSHIP REVIEW