ENERGY LAW AND ECONOMIC GOVERNANCE OF CLIMATE ADAPTATION INVESTMENTS

1. Introduction

Economic governance of climate adaptation investments concerns the legal and regulatory rules determining which energy-system resilience projects should be funded, who should pay for them, how their benefits are measured, and when utilities may recover their costs through tariffs. Adaptation investments include storm-hardening of transmission and distribution lines, flood protection for substations, wildfire mitigation, cooling-system upgrades, backup infrastructure, undergrounding, microgrids, vegetation management, and climate-resilient generation assets.

Because many adaptation projects require substantial expenditure before their benefits are visible, regulators must balance reliability, affordability, prudence, intergenerational equity, and climate-risk reduction.

2. Prudence Review

A central regulatory methodology is the prudence test. Utilities are generally permitted to recover efficiently and reasonably incurred costs, while imprudent expenditure may be excluded from the rate base.

Courts have recognised that prudence should ordinarily be assessed according to the information reasonably available when the investment decision was made rather than through hindsight. This is especially important for climate adaptation because severe-weather events involve uncertainty regarding timing, location, and magnitude.

Utilities should therefore document climate projections, engineering assessments, alternative investments, cost-benefit analysis, and the consequences of taking no adaptive action.

3. Cost-Benefit and Resilience Assessment

Regulators may require adaptation projects to demonstrate measurable benefits such as:

avoided outage costs;

lower storm-restoration expenditure;

reduced equipment damage;

protection of critical facilities;

improved reliability and resilience;

reduced wildfire or flooding exposure;

avoided future reconstruction costs; and

protection of vulnerable customers.

However, climate resilience presents difficulties because benefits often consist of losses that do not occur. A project may appear underutilised for years and still be economically justified if it prevents catastrophic disruption.

FERC's transmission framework similarly permits incentive treatment for transmission investments that enhance reliability or reduce delivered-power costs, while all resulting rates remain subject to Federal Power Act standards.

4. Cost Allocation

Adaptation governance must determine whether costs should fall on utility shareholders, directly connected customers, a regional customer base, government, or combinations of these groups.

A beneficiary-pays approach attempts to allocate costs according to identifiable benefits. Broader social funding may nevertheless be justified where climate-resilient infrastructure protects hospitals, telecommunications, water networks, emergency services, and regional economic activity.

FERC Order No. 1920 requires long-term transmission planning and formal cost-allocation methodologies, illustrating the broader principle that major forward-looking grid investments need transparent allocation mechanisms rather than arbitrary cost shifting.

5. Case Law: Ameren Illinois Company v Illinois Commerce Commission

Case Name/Citation: Ameren Illinois Company v Illinois Commerce Commission, 2026 IL App (5th) 240164.

Facts: Ameren proposed a substantial storm-hardening programme involving stronger poles and other resilience investments. The Illinois Commerce Commission reduced the proposed expenditure after finding that the evidentiary record did not justify the full amount requested.

Legal Issue: Whether the Commission lawfully reduced funding for a programme intended to address severe weather and climate-related reliability risks.

Judgment: The appellate court upheld the Commission's decision, finding substantial evidence supporting the reduced allowance.

Legal Principle/Ratio: A resilience objective does not automatically establish entitlement to full cost recovery. Utilities must substantiate the scale and cost-effectiveness of proposed adaptation expenditure.

Significance: Climate adaptation investment remains subject to ordinary regulatory scrutiny concerning evidence, prudence, affordability, and demonstrable system benefits.

6. Case Law: Connecticut Light & Power Co. v PURA

Case Name/Citation: Connecticut Light & Power Co. v Public Utilities Regulatory Authority, SC21123 (Conn. 2026).

Facts: The utility sought recovery of more than $17 million in capital expenditure associated with repairs following several catastrophic storms. PURA determined that those costs required appropriate review before inclusion in rates.

Legal Issue: Whether storm-related capital expenditure could be recovered automatically through an existing capital-adjustment mechanism.

Judgment: The Connecticut Supreme Court found ambiguity in the governing settlement concerning treatment of the storm-related capital expenditure and addressed the need to interpret that framework before deferring to regulatory discretion.

Legal Principle/Ratio: Climate- and storm-related investments remain subject to the specific tariff, settlement, and prudence-review mechanisms governing utility cost recovery.

Significance: Even necessary resilience spending requires legally established procedures for passing costs to consumers.

7. South African Regulatory Context

South African tariff regulation similarly requires attention to efficiency, transparency, equity, long-term sustainability, investment, and customer interests. The Supreme Court of Appeal has emphasised these statutory objectives when reviewing NERSA's electricity decisions. Recent South African litigation has also expressly raised the climate resilience of proposed electricity infrastructure as an environmental-authorisation consideration.

8. Conclusion

Economic governance of climate adaptation investments requires regulators to combine forward-looking climate risk assessment, prudence review, cost-benefit analysis, tariff regulation, beneficiary-based cost allocation, affordability safeguards, and transparent judicially reviewable decisions. The central principle is that climate resilience may justify substantial investment, but neither urgency nor uncertainty eliminates the obligation to demonstrate that expenditure is reasonable, proportionate, and fairly allocated.