Duke Energy Florida Solar and Net Metering Guide

Duke Energy Florida serves a large portion of Central, west-central, and northern Florida. For a Duke customer considering rooftop solar, the first step is understanding Florida’s investor-owned utility net-metering rule — and then applying it to the home’s actual usage, roof, rate schedule, and future plans.

Quick answer: Duke Energy Florida is an investor-owned utility subject to Florida Public Service Commission Rule 25-6.065. Qualifying systems can receive monthly net-metering treatment, while unused annual credits are handled at the applicable avoided-cost energy rate.

How monthly net metering works

Under Florida’s current investor-owned utility rule, excess customer-owned renewable generation delivered to the grid during a billing cycle is credited toward energy use in the next billing cycle. Credits can accumulate for no more than 12 months.

At the end of the calendar year, unused energy credits are paid at Duke’s applicable COG-1 or as-available avoided-cost energy tariff rather than remaining as indefinite retail-value credits.

This creates two practical design goals:

• Offset realistic annual consumption
• Avoid building a large surplus that is ultimately valued at a lower year-end rate

Use 12 months of Duke usage

Florida cooling loads can change dramatically by season. A system designed from one recent bill can be materially wrong.

A good analysis should review:

• Each of the last 12 monthly kilowatt-hour totals
• The current Duke rate schedule
• Occupancy changes
• Roof exposure and shade
• Pool-pump schedule
• Electric vehicle plans
• HVAC replacement plans
• Additions or accessory buildings
• Work-from-home usage
• Whether propane or gas appliances may become electric

Monthly production matters, not just one annual number.

Florida interconnection tiers

Duke’s customer-owned renewable projects fall under the statewide tier framework:

The current application, insurance, disconnect, fee, study, and technical requirements should be checked directly against Duke’s active interconnection documents before the project is sold or submitted.

Do not rely on an old proposal, an installer’s memory, or another utility’s checklist.

What permission to operate means

Installation is not the last step.

A typical project must move through:

• Design and engineering
• Local permitting
• Installation
• Building and electrical inspection
• Utility interconnection submission
• Duke review
• Meter work
• Permission to operate
• System activation and monitoring

The homeowner should be told which company is responsible for each step and how project status will be communicated.

Will a Duke customer still have an electric bill?

Yes.

Net metering can reduce the amount of energy billed, but the utility relationship continues. The post-solar bill can include:

• Customer charges
• Minimum or non-energy charges under the current rate
• Taxes and assessments
• Net electricity purchases
• Seasonal usage above solar production
• Charges that are not offset by exported kilowatt-hours

A realistic estimate includes the remaining Duke bill rather than presenting it as zero.

Does a Duke solar system need a battery?

Not necessarily.

Under retail monthly net metering, exported solar already receives useful billing treatment. That means storage is often evaluated primarily for:

• Backup during hurricanes and thunderstorms
• Keeping refrigeration, internet, lights, and outlets running
• Supporting a well pump or medical equipment
• Maintaining work-from-home capability
• Reducing dependence on portable generators
• Managing selected commercial demand peaks

A battery can add self-consumption, but it should not be represented as automatically paying for itself.

Why solar panels shut down during a Duke outage

A standard grid-interactive solar system must stop sending power into a de-energized utility grid. Without proper isolation, solar could endanger lineworkers or damaged equipment.

Solar-plus-storage systems can be designed to separate the home from the grid and create a local backup microgrid. The backed-up circuits, power capacity, usable energy, and solar-recharge behavior must be engineered.

How to think about air conditioning

Central air conditioning is usually one of the largest Florida loads.

Questions to answer before promising air-conditioning backup:

• Is the system central, mini-split, or window-based?
• What are the running and startup requirements?
• Is a soft starter compatible and permitted?
• How many battery units are proposed?
• Which other loads will run simultaneously?
• Is automated load shedding included?
• What indoor temperature strategy will the homeowner use during an extended outage?

A battery may run selected cooling loads, but “runs the AC” is not a complete design statement.

Residential candidate profile

A Duke-served home may deserve a closer solar review when it has:

• Stable or rising electric usage
• Limited shade
• A roof with sufficient remaining life
• A favorable production layout
• A homeowner planning to remain in the property
• An agreement structure that improves the expected cost path
• Realistic expectations about the remaining utility bill

A more cautious review is appropriate when the roof is near replacement, the property is heavily shaded, the homeowner expects to move soon, or the proposal depends on aggressive rate-escalation assumptions.

Commercial Duke considerations

Commercial analysis should use interval data when available. Key questions include:

• Does the business use most power during solar-producing hours?
• Is the account billed for demand?
• Will solar reduce the measured demand peak?
• Would storage or controls improve peak reduction?
• Is the roof owned, leased, or under a short remaining term?
• What tier and insurance requirements apply?
• Are service or transformer upgrades needed?
• Who will own the system and use any available tax benefits?

Frequently asked questions

Does Duke Energy Florida offer net metering?

Duke Energy Florida is subject to Florida’s investor-owned utility net-metering rule for qualifying customer-owned renewable generation.

Do Duke solar credits roll over?

The Florida rule permits monthly carryforward for up to 12 months. Unused annual credits are then paid at the applicable avoided-cost energy tariff.

Will Duke pay retail value for a large annual surplus?

Do not assume so. Monthly energy credits and the annual payout are treated differently. The year-end rate is based on the applicable as-available or avoided-cost tariff.

Is a battery required?

No. A battery is optional for most grid-connected solar systems. It is primarily an outage-resilience and energy-management decision.

Is Sunstorm Energy part of Duke Energy?

No. Sunstorm Energy is independent and is not affiliated with or endorsed by Duke Energy Florida.