Facilities that are at the end of their useful life, inoperative or stranded present a massive potential cost for future mitigation. In 2023, BNP Paribas estimated that the total global cost of decommissioning assets in some select sectors could reach almost $8 trillion over the coming decades. This estimate could be much higher with the inclusion of sectors such as conventional power that were not originally considered in the study. Further, the accelerated end of life of many energy assets and escalated costs of labor and equipment would also add to the estimated total cost of decommissioning. The bank estimated that only about half of these obligations were prefunded. In the bank’s opinion, many asset owners underestimate the cost of decommissioning, underfund the obligations, or expect to meet the expenses from operating cash flow.

The nuclear power industry provides a useful example of planning for end-of-life obligations. Under Title 10 of the Code of Federal Regulations, Section 50.75, nuclear power reactor licensees must demonstrate reasonable assurance that funds will be available for radiological decommissioning. Licensees may satisfy this requirement through approved financial assurance mechanisms, including prepayment, an external sinking fund, surety or insurance, a parent-company guarantee, or an authorized combination of these methods. These requirements are intended to see that adequate resources are available when a facility reaches the end of its operating life.

In contrast, an example of unfunded remediation costs involves abandoned or orphaned oil and gas wells. Orphan wells are created when remediation obligations cannot be attributed to an owner because of an absence of clear or recorded passage of liability, or the bankruptcy of original or successor operators. No provisions were made for their remediation while operating. Consequently, the cost of remediation for millions of abandoned wells in North America falls to federal, state, tribal and local governments, with a total exposure of a few hundred billion dollars.

Lessons learned from such cases have contributed to greater regulatory attention to establishing decommissioning liabilities early in an asset’s life. For conventional and renewable power projects, permitting increasingly requires a working plan for future decommissioning along with financial assurance or other evidence that adequate funding will be available.

The first step in planning for end-of-life retirement is to understand the potential cost of decommissioning and site rehabilitation. That need exists irrespective of the plant’s remaining operating life, the expected timing of retirement or the source of funds used ultimately to pay for it.

A reliable decommissioning cost estimate requires a thorough understanding of the facility and its unique characteristics. Key considerations include the proposed dismantling methods, the salvage or resale value of materials and equipment, the types and quantities of waste requiring removal, and the required final site condition. The estimate should account for the labor, equipment, transportation, disposal and other costs associated with accomplishing the decommissioning work.

A well-supported estimate provides plant owners a clearer understanding of their future financial obligation, but its value extends beyond retirement planning. The estimate can support financial reporting, funding and cost recovery, regulatory requirements, and decisions about the future of the asset, including:

Reporting asset retirement obligations (ARO). In accounting rule ASC 410, an ARO is recognized as a legal obligation to retire an asset because of a law or a binding contract. AROs must be recognized at fair value when the obligation is incurred, often at the start of a project. They also must be updated during the life of the project if initial assumptions change. The fair value estimate of an ARO relies directly on a decommissioning cost study. This study provides expected cash outflows for dismantling or restoring a site. That output is adjusted for inflation and discounted to present value to establish the initial balance sheet liability.

Reporting constructive obligation. A constructive obligation arises when past actions or public promises of a plant owner create a valid expectation that it will pay or perform a service. This is a quantified financial provision, under rules such as ASC 450 or IAS 37, that a company records for a noncontractual responsibility, such as conducting a level of environmental remediation not required by regulation. Like an ARO, a constructive obligation also requires a reliable cost estimate such as a decommissioning study.

Prefunding decommissioning reserves. When funds are set aside over the operating life of a facility to cover anticipated decommissioning costs, they provide plant owners with a reliable and predictable reserve to meet long-term liabilities at retirement. Using the same general concept as employee pension funds, prefunding reduces the risk of a financial shortfall and the need to rely on government or taxpayer support. An initial reliable estimate of the decommissioning costs and periodic updates allow the asset owner to check whether reserves remain aligned with estimated obligations.

Calculating rate of depreciation for utility ratemaking. Through the ratemaking process, regulated utilities generally recover the long-term costs of capital assets over their useful service lives through depreciation. The depreciation calculation includes the original cost of the facility, anticipated gross salvage proceeds, and the estimated cost of decommissioning and removal. When decommissioning and removal costs exceed the expected salvage value, the result is a negative net salvage. Depending on the plant’s generating technology, size, configuration, waste quantities and environmental remediation requirements, these costs can be substantial.

An accurate and defensible decommissioning cost estimate allows regulators to incorporate the anticipated obligation into customer rates over the facility’s remaining service life. This approach helps utilities accumulate funds for retirement activities while allocating the costs to the customers who currently benefit from the plant’s operation. This helps maintain intergenerational equity by balancing the costs and benefits of long-lived energy infrastructure fairly between current and future generations. Spreading recovery over time reduces the risk that future customers will face significant rate increases when the plant retires and the decommissioning costs are ultimately incurred.

Permitting and licensing for power plant construction. When planning a new power plant, regulatory bodies at the federal, state, tribal and/or county level may require detailed end-of-life decommissioning estimates before the start of construction or operation. The permitting process often requires detailed narratives around potential dismantlement methodologies, site decontamination, waste transportation and an environmental reclamation plan, accompanied by a cost estimate. Operators must maintain preliminary site-specific plans and estimates of decommissioning cost and update them periodically.

Providing financial assurance. Regulators increasingly require active financial assurance for contingent liabilities for power plants under development, including conventional and renewable power plants. The assurance might take the form of sinking funds, surety bonds and letters of credit. This establishes that funds will be available at end of life irrespective of the future financial state of the operating company. Decommissioning estimates provide assurance to both regulators and guaranty providers that the provisions are adequate and their pricing is fair.

Supporting decisions on a power plant’s future use. Decommissioning is expected to be the final step when a power plant reaches the end of its useful life. However, the timing of decommissioning might change if other options for use of the asset are available. These could include divestment as is with an all-inclusive payment, delaying decommissioning by extending the life of the plant, or repurposing the asset while making use of its valuable interconnections and permits. With an accurate decommissioning estimate, along with estimates for the life-cycle cost for the other options, plant owners can make optimal economic decisions. 

For power generation asset owners, a decommissioning cost estimate is more than a forecast of future expenditures. A detailed, site-specific analysis supports a variety of decisions. The following case studies illustrate how independent, scope-based estimates can support decisions with material long-term financial consequences.

Case Study #1: Retiring in Place vs. Full Demolition

An asset owner evaluating retirement of a generating facility needed to compare two strategies:

• Retire the facility in place by decommissioning and securing it without immediate dismantlement; or
• Proceed with full demolition, environmental remediation and site restoration directly following retirement.

A comparison based only on near-term capital costs would favor retirement in place, as it allows for deferral of costly demolition expenditure. This approach, however, can create ongoing carrying costs and liabilities associated with site security, inspections, insurance, utilities, structural maintenance and environmental compliance. To support ownership decision-making, detailed estimates were compiled for both immediate capital costs and ongoing annual expenditures. These estimates enabled a net present value analysis by the owner, eventually helping demonstrate that deferring demolition shifted the obligation into the future but did not eliminate it. Based on the results of the financial modeling, supported by decommissioning cost estimates, the owner determined it was financially prudent to perform a full demolition project shortly after retirement of the facility.

Case Study #2: Plant Valuation During Ownership Transactions

A partial owner of a generating facility was considering acquiring another partner’s ownership interest. The partners had developed data-driven views of the facility’s value based on expected operating performance and future cash flows. However, this valuation did not fully incorporate the facility’s end-of-life obligations.

Excluding decommissioning liabilities can distort the value of an ownership interest. The purchasing party would acquire not only a share of the plant’s future earnings, but also responsibility for demolition, environmental remediation, waste disposal, site restoration and other retirement-related costs. Uncertainty regarding the magnitude or allocation of those obligations could become an obstacle during transaction negotiations.

An independent, site-specific decommissioning study established a defendable common basis for evaluating the facility’s retirement liability. Incorporating this liability into the transaction analysis increased confidence in the valuation and purchase price while reducing the risk of either party assuming a disproportionate share of future decommissioning costs. This case study demonstrates that asset value must reflect both expected cash flows and end-of-life obligations.

Although decommissioning occurs at the end of a power plant’s operating life, its anticipated cost can influence decisions made years or even decades earlier. Developing and periodically updating a decommissioning cost estimate provides plant owners with a clearer understanding of this future obligation as regulations, market conditions, costs and plans for the facility evolve.

This insight supports informed decision-making throughout the plant’s life cycle, including financial planning, regulatory compliance, capital investment, and evaluations of whether the facility should be retired, repurposed or operated longer. Understanding the potential cost of decommissioning well before it comes due allows owners the time and flexibility to develop a deliberate, financially responsible plan for the plant retirement.