Solmar Insights
Duke Energy Florida (DEF) is under scrutiny from state officials for its decision to delay the implementation of a dedicated rate for large power customers, including data centers, following new state requirements in SB 484. DEF argued to the Florida Public Service Commission (PSC) that its existing and proposed tariffs provide sufficient safeguards for the general rate base, but key state and consumer representatives say the utility is not meeting statutory obligations.
Key figures
SB 484 signed in May 2026
20-year minimum term for large load customers
DEF first IOU to file data center tariff compliance
State mandate and utility response
In response to the passage of SB 484 in May 2026, Florida utilities are required to provide specific tariff structures and service terms for large load customers, with a clear focus on data center developments. Duke Energy Florida, the first major investor-owned utility to submit its compliance proposal, contends that changes to its Contribution in Aid of Construction tariff and other minimum requirements suffice to meet the law. According to DEF’s filing, these changes include requiring large load applicants to advance all anticipated extension and service costs and commit to a 20-year minimum term of service.
However, the absence of a bespoke rate specifically targeting data center and other high-demand loads has drawn scrutiny. The Office of Public Counsel (OPC), led by Walt Trierweiler, asserts that DEF’s proposal fails to comply with the law’s explicit requirements, notably by not introducing a dedicated rate for these new customers. Trierweiler argued that DEF’s rationale, that their current settlement agreement precludes immediate rate changes, does not exempt them from the statutory obligations of SB 484.
Arguments at the public service commission
During the public hearing, multiple parties provided opposing perspectives on DEF’s approach. The OPC maintains that no clause in existing settlement agreements exempts the company from the SB 484 requirements, pushing for compliance that would more directly isolate the cost impact of data center loads from other customers. The legal position was that current defensive measures do not substitute for a new rate structure and that obligations under the law are clear regardless of DEF’s previous rate proceedings.
Representatives from Earthjustice, advocating for environmental and consumer interests, highlighted the potential risk of stranded costs if data center demand collapses after significant grid infrastructure buildout. Bradley Marshall of Earthjustice warned the PSC that a speculative “bubble” in data center investment could leave existing customers paying for unneeded generation or transmission, fueling additional affordability pressures in Florida’s rate environment.
Industry pushback and market risk
On the other side, representatives for industrial power users, including attorney John Moyle, argued against a hasty adoption of new large load pricing models, fearing that premature or overly aggressive regulation could deter high-value industrial and digital infrastructure investments. Moyle contended that changes should be approached cautiously to avoid discouraging large energy consumers, such as data centers, from locating in Florida.
Duke’s legal counsel, Dianne Triplett, responded that no intervening party has shown how the proposed tariff structure would result in increased costs for existing customers if approved. The utility maintains that its model, requiring upfront payments for infrastructure and enforcing long service terms on large users, already achieves the central aim of cost protection described in SB 484. Still, the lack of a separate, transparent rate for large loads remains a sticking point among key state advocates and market observers.
Implications for data center development
Florida has recently attracted increased interest from hyperscalers, cloud providers, and AI compute firms, making its policy and regulatory climate for large power connections especially significant. The SB 484 law is designed to hold large loads directly accountable for grid upgrade costs, seeking to avoid cost socialization that has raised concerns elsewhere in the US. DEF’s proposal, if accepted without a separate large load rate, may offer less pricing clarity for incoming data center projects, potentially influencing site selection and timing for market entry compared to peer states with clear tariffs.
The dispute also highlights broader tensions between rapid digital infrastructure growth and longstanding rate design principles in regulated utility markets. For institutional buyers and developers navigating interconnection queues and permitting in the Southeast, tariff clarity and cost allocation policies are critical, deeply affecting both risk modeling and capital planning for large-scale projects.
What comes next at the PSC
The Florida PSC’s decision on Duke’s current tariff proposal will set an important precedent for other utilities responding to SB 484 mandates. As the first case of its kind in the state, the outcome will inform how costs and risks are apportioned between legacy customers and new large load entrants, an issue that will shape the future cost of grid expansion, rate base stability, and investor appetite for new data center construction.
Clarity on this question is likely to accelerate or delay some near-term decisions by hyperscale customers, developers, and their equity partners. Ultimately, the case is being watched for whether Florida becomes more or less attractive for digital infrastructure buildout and industrial load growth over the next cycle.
What this means for buyers
Data center power and interconnection capacity in Florida are directly affected. With Duke Energy Florida declining to set a new dedicated large load rate despite SB 484, buyers must assume that grid upgrade costs will be advanced up front but without a separate transparent rate. This changes pro forma modeling, and means siting and timing decisions now turn on pending PSC action.
Reporting via the original publisher
