A BESS decommissioning bond should be sized from a net decommissioning cost that changes every year of the project’s life, not from a single estimate of what removal would cost today. Most permits require a battery storage decommissioning plan, a cost estimate and a security instrument. The plan is rarely the problem. The estimate behind the bond is.
A single-year estimate is wrong in both directions. It overstates the cost in the early years, when equipment still has resale or recycling value. It understates the cost in the late years, when that value has gone and some components cost money to dispose of. The BESS permitting guide lists what a decommissioning plan contains; this article covers the number behind it.
A defensible estimate has two layers: the removal and restoration tasks, and the contractor costs on top of them. The task layer for a utility-scale battery storage project typically includes:
Contractor profit, overhead and management, and contractor insurance then sit on top as a separate layer. Leaving that layer out is one of the most common reasons an estimate gets rejected.
The inputs come from three disciplines. The civil engineer prices removal and restoration at local prevailing wage rates. The fire protection engineer supplies battery salvage value per kWh, recycling fees and hazardous materials transport costs under Department of Transportation (DOT) rules. The owner’s engineer supplies the battery recycling method. An estimate that skips the fire protection inputs usually treats the batteries as ordinary scrap, and an AHJ (authority having jurisdiction) reviewer will notice.
Two items get missed often. The first is augmentation units added after commercial operation, which increase what has to be removed. The second is contingency. Carina recommends a 20% to 30% contingency when the estimate is used to set a surety amount, because recycling markets and labor rates will move over 20 years.
The better approach is to model, for each salvageable item, its market value year by year until that value turns negative. The model tracks the remaining depreciation of each asset class alongside it. Removal and restoration costs are escalated over the same years. The output is the net decommissioning cost in any future year, not a single figure.
Battery containers, transformers, copper and aluminum conductor, and structural steel each follow a different curve. Steel and copper hold value. Transformers hold value early and fall as they age. Battery modules lose value fastest. For lithium iron phosphate (LFP) chemistry, the recovered material value is low, so the battery line can cross from salvage credit to net disposal cost well before end of life.
That curve changes the bond conversation. It lets the developer argue for a lower initial amount where salvage credit is allowed. It shows the AHJ when and why the amount should step up. And it gives the review intervals a number to check against, instead of a fresh negotiation each time.
Most decommissioning requirements for storage come from the local permit, usually as conditions of a conditional use permit (CUP). Local ordinances differ widely on salvage credit, bond form and the timing of posting.
New York’s state siting process, run by the Office of Renewable Energy Siting (ORES) under Public Service Law §137 (formerly Executive Law §94-c), reaches battery storage only when it is co-located with a qualifying renewable facility of 25 MW or more. A standalone battery storage project in New York stays on the local permitting path, whatever its size.
Where the ORES process does apply, the application exhibit under 16 NYCRR §1100-2.24 (formerly 19 NYCRR §900-2.24) requires both a gross and a net decommissioning and site restoration estimate, with projected salvage value shown. In filed applications, the financial assurance is commonly a letter of credit held by the host towns under a decommissioning agreement with the applicant. For a co-located project, the battery should get its own salvage curve. Solar modules, racking steel and battery modules do not lose value at the same rate, and one blended salvage assumption hides the battery’s crossover to net cost.
The timing of posting is negotiable more often than developers assume. A security posted at building permit issuance costs the project for the whole construction period. Posting at commercial operation, with a construction-phase restoration commitment instead, is a reasonable request in many jurisdictions. Raise it at the CUP stage, before the conditions are drafted.
Periodic reviews are where projects get caught. The failure modes repeat:
The fix is to keep the cost model live. Update it at each augmentation event and before each scheduled review, and submit the update before the AHJ asks for it. A reviewer who receives a documented, line-by-line update rarely reopens the whole number.
Carina Energy is a boutique owner’s representative firm specializing in BESS permitting and development. If you’re negotiating decommissioning conditions or a bond amount for a battery storage project, get in touch to discuss your project.
The guide above covers the fundamentals. Subscribers to our BESS Permitting Intelligence Newsletter get the operational detail: BESS FEOC compliance updates, OEM manufacturing moves, supplier landscape shifts, and tariff developments. The Carina Dispatch also includes BESS moratorium tracking across 150+ jurisdictions and interconnection queue trends across all seven US power markets. One newsletter, three intelligence layers.
READ BY HUNDREDS OF BESS PLAYERS
