Stranded capital risk in DER

Our Finance hub tests four failures at fixed dates. The chart below asks a sharper question: for each failure, how early does it have to happen to push the 100 kW battery below its net cost?

On its own, a program ending pushes the battery below net cost only if it happens before year 1, and a 40% demand-charge cut only before year 2, because the other value stream carries most of the value. Both changes together cross the line if they happen before year 7. Losing all revenue, as with a host sale without an assignment clause or a provider exit with no successor, crosses the line before year 10. A temporary gap is much cheaper: a one-year loss of Fast DR pay in year 6, while a new operator re-enrolls the battery, costs about 2% of value.

The practical lesson: stranding risk is front-loaded. Investors price protection for the first several years far more heavily than the tail, and contract terms such as termination payments are usually set on a declining schedule for the same reason.

SunPower filed for bankruptcy on August 5, 2024, and sold its brand and some assets; the buyer honors warranties only for systems installed by its own companies (SunPower’s warranty page). Several hundred thousand SunPower customers relied on its proprietary gateway for monitoring, and more than 2,500 had switched to Enphase monitoring by April 2025 (Enphase).

Sunnova, the second-largest provider of third-party-owned home solar, filed on June 8, 2025. Its assets were sold and the company wound down; a new servicer took over billing and monitoring (a bankruptcy tracker). Its filings describe how much of the service promise sat with the company: monitoring, performance guarantees and repair warranties attached to its loans, leases and PPAs. Equipment makers said their own product warranties continue.

For an investor the point is structural. Customer protections that depend on the provider’s balance sheet, such as production guarantees, are only as strong as the provider. Pending guarantee claims against Sunnova became unsecured claims in the bankruptcy (OwlWatt’s guide). Protections backed by a manufacturer or a contract that transfers to a successor are much stronger.

A DER asset that earns from a program has to stay connected. When US carriers shut down 3G networks in 2022, starting with AT&T on February 22, solar systems with 3G modems kept producing but stopped reporting, as Enphase warned its customers. Systems that earned solar renewable energy credits from metered production stopped earning them until the modem was replaced. One installer documented a system connected in 2020 that lost monitoring two years later; the replacement modem wasn’t a warranty repair because nothing had failed (Cali Energy’s case study).

For VPP assets, the communications path is the revenue path. Diligence should ask which network, gateway and protocol each device uses, who pays to replace them, and whether the device can be enrolled by another operator using an open standard if the original one leaves.

Utilities face the mirror-image risk, and it flows back into the rates DER is measured against. Massachusetts regulators now require gas utilities to show that non-pipe alternatives such as electrification were considered before recovering new pipeline costs, as the DPU announced with Order 20-80. The follow-up order directs the utilities to forecast how much investment could be stranded and to study accelerated depreciation. The state attorney general’s office defines a stranded asset as one that becomes unnecessary before the end of its nominal service life.

Accelerated recovery of stranded gas assets raises gas bills in the near term, which can improve heat pump economics. Electric-side costs from large-load forecasts that don’t materialize can raise electric rates. Either way, a DER model’s rate path should reflect how the utility recovers its own stranded costs.