Duke NC Solar Choice vs Net Metering Bridge
Compare Duke Energy Carolinas' North Carolina solar riders, bridge enrollment conditions, monthly netting, remaining charges, and the account details to verify.
Sources reviewed: 2026-10-06
Key takeaways
- These rules concern Duke Energy Carolinas residential accounts in North Carolina, not Duke Energy Progress or South Carolina.
- The reviewed bridge rider closes to new participants on January 1, 2027. Availability is also capacity-limited and requires a valid application.
- Solar Choice requires a time-of-use rate with critical peak pricing. Bridge customers are not universally required to choose that arrangement.
- Netting, excess-energy credits, capacity-based charges and minimum-bill calculations are different parts of the bill.
Identify the utility and rider first
Read the utility name, service address, rate schedule and solar rider on your actual bill. Duke Energy Carolinas and Duke Energy Progress have separate North Carolina tariff sheets, and a Duke-branded bill in South Carolina is not governed by the North Carolina riders reviewed here. Ask the utility to identify your rider in writing if the statement or installer proposal does not make it clear.
This guide compares Duke Energy Carolinas' Residential Solar Choice, Rider RSC, and Net Metering Bridge, Rider NMB. The reviewed sheets are effective for service on and after September 1, 2026. They apply alongside an eligible underlying residential rate schedule, not instead of every other billing rule. Read the RSC rider before using a quote's assumed export value.
Bridge enrollment has both a deadline and a capacity limit
The current NMB rider states that new participation is closed on and after January 1, 2027. It also reserves annual capacity on a first-come, first-served basis upon submission of a valid interconnection application. The listed 2026 annual allocation is 38,700 kW AC; that allocation is not a live count of the capacity still available today.
An application submitted before the closing date is therefore not proof of eligibility. Confirm capacity, application validity, system size and the account's circumstances with Duke. The rider describes a bridge period of up to 15 calendar years from the applicable application date for qualifying participants, followed by RSC or another then-effective net-metering tariff. See the NMB availability and bridge-period provisions.
Identify the applicable Duke NC solar arrangement
- Confirm the service territory: Use Duke Energy Carolinas' North Carolina sheets only for an account in that territory.
- Identify the current or proposed rider: Distinguish legacy NM, Net Metering Bridge NMB and Residential Solar Choice RSC.
- Check timing and capacity: For a new bridge application, verify valid submission, annual capacity and the January 1, 2027 closure.
- Obtain written confirmation: Have Duke confirm the rider, underlying schedule and applicable transition before relying on a quote.
Diagram sources: www.duke-energy.com, publicstaff.nc.gov
How Solar Choice treats time periods
RSC requires Schedule RSTC or RETC, both residential time-of-use schedules with critical peak pricing. Grid imports and deliveries are netted within each pricing period. Critical peak hours form a separate period. An annual total showing equal imported and exported kWh does not establish equal charges and credits.
For a labeled hypothetical example, suppose a household exports 100 kWh in one period and imports 100 kWh in a different period. The annual energy totals cancel mathematically, but that does not authorize cross-period retail-value netting under RSC. Use the rate schedule, critical-peak definitions and RSC netting provisions to determine the actual dollar result.
How Bridge differs from Solar Choice
NMB describes monthly netting under the applicable underlying schedule. For customers on a time-of-use schedule, it first offsets usage in the same period and applies remaining excess to lower-priced periods in descending price order. Critical peak hours, when applicable, remain a separate period. The bridge rider therefore must not be modeled as one universal all-day tariff.
The state's Public Staff explains that Bridge does not impose the same universal TOU-with-critical-peak requirement as Solar Choice. That policy page is useful context, but the current filed rider and actual rate schedule control a bill. Compare the Public Staff explanation with the current sheets rather than treating an older overview as a current rate quote.
A monthly ledger is not the complete bill
For an original hypothetical NMB illustration on an eligible non-TOU schedule, 650 kWh imported and 600 kWh exported leave 50 kWh of net imports. In a separate month, 500 imported and 650 exported leave 150 kWh of net excess energy. These examples illustrate quantities only; they are not real customer statements or forecasts.
The reviewed NMB sheet lists a net excess energy credit of 4.53 cents per kWh. Applying that dated figure to the second hypothetical month gives 150 multiplied by $0.0453, or approximately $6.80 before the utility's actual rounding and billing treatment. It is a surplus credit, not payment for all inverter generation and not a guarantee of a negative total bill. Source: NMB monthly netting and rate.
Minimum bills and capacity charges require separate checks
Both reviewed riders describe a $22 minimum calculation specific to customer and distribution costs. Under their wording, the minimum-bill charge is the shortfall when the defined eligible costs are below $22. Net excess credits are applied after that calculation, so '$22 minimum bill' is not an accurate promise that the final total can never fall below $22 or that every bill equals $22.
The riders also contain a monthly non-bypassable charge based on nameplate capacity and other conditions. Solar nameplate capacity is measured in kW DC for that charge, while the residential system eligibility limit uses AC capacity and estimated maximum monthly demand. Check exemptions and definitions in the RSC minimum-bill and general provisions, not just an installer worksheet's single system-size number.
Follow quantities before calculating the final bill
- Measure imports and exports: Use the utility meter and the pricing periods required by the customer's rider.
- Apply the rider's netting: Determine net imports and qualifying net excess using RSC or NMB rules.
- Calculate charges and the defined minimum: Apply the underlying schedule, capacity charges and minimum-bill test where applicable.
- Apply excess-energy credits: The reviewed minimum-bill provisions exclude those credits from the minimum test and apply them afterward.
Diagram sources: www.duke-energy.com, www.duke-energy.com
Legacy customers need an account-specific transition answer
Public Staff summarizes a December 31, 2026 transition for existing residential customers on legacy Rider NM. Do not assume an old NM contract, a new NMB application and an RSC enrollment are interchangeable. The history of the interconnection request and the currently assigned rider matter.
Before adding capacity, buying a home with solar or changing a rate, ask which rider applies now, what changes at the relevant transition date, and how the bridge period is measured for that installation. Keep the response with the interconnection documents. Start with the official policy context, then obtain a written account-specific confirmation from Duke.
Compare a proposal without inventing a best-plan winner
A defensible comparison needs the applicable rate sheets, interval imports and exports, seasonal and critical-peak definitions, system capacity, fixed and capacity-based charges, and any battery operating assumptions. Gross annual solar generation alone cannot decide which arrangement costs less.
Obtain interconnection approval before operation and keep the written tariff confirmation with the proposal. Our energy-flow calculator explains approximate annual kWh, not these dollar rules. The small-system interconnection information is a starting point, not permission to operate. This guide does not determine live enrollment capacity or promise savings.
Rider comparison, reviewed October 6, 2026
| Question | Residential Solar Choice, RSC | Net Metering Bridge, NMB |
|---|---|---|
| Underlying schedule | RSTC or RETC, TOU with critical peak pricing | Applicable eligible residential schedule; TOU not universally required |
| Netting | Within each TOU period, with CPP separate | Monthly under the schedule; special ordering rules apply when on TOU |
| New participation | Subject to rider and interconnection eligibility | Capacity-limited; closed to new participants from January 1, 2027 |
| Long-term arrangement | Check current rider and schedule | Qualifying bridge period up to 15 calendar years, then a then-effective tariff |
| Remaining charges | Underlying schedule, capacity charges and defined minimum | Underlying schedule, capacity charges and defined minimum |
Frequently asked questions
Does submitting before January 1, 2027 guarantee Bridge enrollment?
No. The reviewed rider also requires valid application and available annual capacity, as well as other eligibility conditions. Ask Duke to confirm the account's eligibility and capacity reservation.
Does Bridge require a time-of-use rate?
Not universally. Solar Choice requires RSTC or RETC with critical peak pricing. Bridge uses the eligible underlying schedule; customers who select TOU must follow its special netting rules.
Is the bridge period 15 years from installation?
The reviewed rider ties an eligible bridge period of up to 15 calendar years to the applicable interconnection application date. Ask Duke which date and period apply to the installation.
Does a $22 minimum mean my total bill can never be lower?
Not under the reviewed wording. It is a calculation for defined customer and distribution costs, and excess-energy credits are applied afterward. Other charges and exemptions also require review.
Do these rules apply to Duke Energy Progress?
No. This guide reviews Duke Energy Carolinas North Carolina tariff sheets. Duke Energy Progress and South Carolina accounts require their own applicable documents.
Can the annual energy calculator pick my cheapest rider?
No. It estimates annual energy flows, not period-specific netting, critical peak pricing, minimum-bill calculations or live enrollment eligibility.