1. Which Energy Regulations Govern California Solar Power Sales?
Solar interconnection requirements depend on the connection point, intended electricity sales, and regulatory jurisdiction. CPUC rules and FERC-approved tariffs govern different project arrangements.
CPUC Rule 21 and State-Regulated Interconnection
CPUC Electric Rule 21 governs qualifying state-jurisdictional connections to investor-owned utility systems, including non-export facilities and certain qualifying facilities selling power to the host utility at avoided cost. It establishes application, screening, and technical requirements. Projects seeking FERC-jurisdictional wholesale market participation generally follow the applicable utility's wholesale distribution tariff or CAISO Tariff instead.
FERC and CAISO Requirements for Wholesale Projects
FERC regulates jurisdictional wholesale electricity sales and interstate transmission. Orders No. 2023 and 2023-A reformed generator interconnection procedures, including cluster studies and queue management. Applicable FERC-approved tariffs and transition rules determine project-specific requirements. Projects connecting to the CAISO-controlled grid follow relevant CAISO Tariff provisions.
2. What Must a Solar Developer Review before Grid Connection?
Interconnection studies may identify network upgrades that affect project costs and completion dates. Developers should establish financial obligations and connection milestones before accepting electricity delivery commitments.
Interconnection Studies and Grid Upgrade Costs
Studies identify required interconnection facilities and network upgrades. Applicable tariffs govern cost allocation, financial security, and potential reimbursement or credits. Revised studies may increase costs, while withdrawal may trigger financial obligations. Developers should account for these exposures when assessing renewable energy project costs.
Connection Milestones and Delay Responsibilities
Interconnection agreements allocate construction responsibilities, milestones, and extension rights. Equipment shortages, permitting issues, or delayed upgrades may affect completion, but relief depends on the governing terms and notice requirements.
For Rule 21 projects, CPUC directs missed-timeline concerns to the utility's Rule 21 ombudsman. Other disputes may follow Section K procedures, separate from contractual remedies.
3. How Do Power Purchase Agreements Allocate Delivery Risks?
A power purchase agreement (PPA) defines electricity pricing, delivery requirements, and risk allocation. Developers must confirm that interconnection rights support the products promised to the buyer.
Electricity Pricing and Capacity Obligations
A PPA agreement may specify fixed or indexed prices, delivery points, metering, and settlement charges. Resource adequacy capacity and renewable energy credits may involve separate obligations.
Under CAISO rules, Energy Only resources have zero Net Qualifying Capacity (NQC) and cannot qualify as resource adequacy resources. Full or Partial Capacity Deliverability Status may support eligibility, but actual NQC and other applicable requirements determine qualifying capacity. Deliverability Status does not guarantee uninterrupted electricity delivery.
Curtailment and Contractual Risk Allocation
Curtailment occurs when operating restrictions or dispatch instructions reduce generation or delivery. CAISO may order reductions under applicable market and reliability rules.
The PPA determines whether curtailed or deemed energy qualifies for compensation, which events excuse delivery, and who bears resulting losses. A grid operator's instruction does not automatically require the buyer to pay for undelivered electricity.
4. How Should Interconnection and Power Sales Terms Be Coordinated?
Construction, interconnection, and power sales agreements may impose different completion conditions. Developers should align these obligations before accepting binding delivery commitments.
Commercial Operation Dates and Contract Dependencies
A PPA may condition commercial operation on testing, approvals, and interconnection authorization. Network milestones and construction completion requirements may differ, so a connection delay does not automatically extend the PPA deadline.
Developers should compare these dates with EPC contracts and energy project finance obligations to identify conflicting completion requirements.
Contract Remedies for Delays and Regulatory Changes
PPAs may provide extensions, liquidated damages, or termination rights for specified defaults. Interconnection tariffs impose separate obligations and consequences.
Force majeure or regulatory changes do not automatically excuse performance. Relief depends on applicable law, contractual definitions, and compliance with notice and cure requirements.
5. Legal Review of Solar Power Sales and Grid Connection Risks
Before committing to a power sale, developers should compare interconnection rights, upgrade costs, deliverability status, and PPA milestones. Daeryun Law Firm can review applicable tariffs and project agreements to assess contractual risks, potential delays, and available legal options.
04 Nov, 2026
