Net metering true-up is a program-defined reconciliation, settlement or reset of accumulated solar billing balances. The applicable tariff determines the period, balance units, payment treatment and charges that remain. The phrase does not establish one universal annual solar bill or cash payout.
For a South Carolina proposal, identify the provider on the property’s bill and the exact solar rider before modeling the settlement. Use the utility information hub to orient that research and the solar financing and incentives page to connect bill assumptions to the purchase comparison.
Our South Carolina net-metering guide retains the utility-by-utility decision coverage. This definition explains settlement terminology. All numerical examples below are fictional arithmetic, except explicitly attributed program rules; they are not customer bills, current rate offers or predicted Sunburst results.
What does net metering true-up mean?
A true-up reconciles a balance under the program’s rules. To understand it, identify what accumulated, over which period and what the utility does with the remainder. A label such as annual settlement is useful only when those questions have answers.
For one account, the relevant balance might be unused energy credits. For another, a statement might show accumulated charges due at a settlement date. Do not assume those two balances are interchangeable merely because both appear on a solar bill.
Write a plain-language account summary using the actual documents: this balance is measured in these units, covers these dates and receives this treatment. If a field is missing, ask the utility to identify it.
The useful purpose of this definition is proposal literacy. A homeowner should be able to distinguish credits used before settlement from the value, if any, assigned to what remains afterward.
Netting interval, billing cycle and true-up period are different
The netting interval determines how imports and exports are compared. The billing cycle organizes the statement. The settlement period determines when a particular accumulated balance is reconciled or reset.
Keep the three fields separate:
| Field | Question to answer | Mistake to avoid |
|---|---|---|
| Netting interval | Within what period are imports and exports compared? | Treating annual totals as the tariff’s calculation |
| Billing cycle | Which meter-read dates appear on the bill? | Assuming every cycle is a calendar month |
| Settlement period | When and how is the accumulated balance handled? | Assuming January or the installation anniversary |
A fictional tariff could compare energy monthly while settling unused balances on a named later cycle. Another fictional arrangement could credit net excess on each bill without the same seasonal energy bank.
Read the actual rider rather than choosing the most favorable interpretation. A proposal that gets the annual production right can still miscalculate value if it uses the wrong interval or settlement rule.
Start with the balance’s units
A balance of 500 kWh is energy. A balance of $500 is money. A statement showing 500 in a column is incomplete evidence until its label and units are known.
Use the kilowatt-hour definition to understand energy quantities. Then identify whether the bill carries energy, monetary credits, accumulated charges or several separate measures.
Do not attach a dollar sign to an energy balance without a justified conversion rate. Likewise, do not convert a dollar credit into an energy bank without a rule that supports that interpretation.
Keep units beside every number in your worksheet. If an account has time-of-use buckets, preserve their labels as well. Removing the labels can hide a restriction that determines where the balance may be applied or how it is settled.
A fictional energy-credit ledger
Assume a made-up program begins a cycle with 300 kWh of eligible carried credits. It adds 200 kWh and uses 400 kWh against eligible consumption during that cycle.
300 kWh + 200 kWh − 400 kWh = 100 kWh remaining.
That arithmetic is a ledger check, not a statement of any actual utility’s rules. The assumed credits must be eligible for those uses before the equation describes an account correctly.
Record opening balance, additions, applications and closing balance separately. If a real bill does not reconcile, ask the utility which period, adjustment or bucket you have omitted rather than replacing its total with a guess.
A clean ledger helps identify the remaining quantity before settlement. It does not determine the payment rate or prove that all credits can offset every charge on the bill.
Why a carried energy credit is not automatically retail-rate cash
Suppose a fictional settlement has 500 kWh remaining. At an assumed settlement rate of $0.04/kWh, multiplication gives $20. At a different assumed rate of $0.20/kWh, it gives $100.
Both multiplications are correct; only the applicable rule could establish which rate belongs in a real calculation. The difference illustrates why you cannot value the remainder from the retail import price alone.
The solar export rate definition explains compensation terminology. A settlement rate may be a distinct field from the value used when an eligible credit offsets consumption earlier in the period.
Ask the utility to identify the actual quantity, rate source and payment method. Do not describe the $100 result as a lost payment or the $20 result as an error without establishing which rules govern the account.
Settlement, carryforward, reset and forfeiture need precise wording
These labels should be recorded separately. Ask whether the balance is applied, paid, moved to the next period, reset after another action or otherwise treated under the tariff.
A reset does not, by itself, explain what happened financially. An energy account could be zeroed after payment. A displayed balance could also change through an adjustment. You need the accompanying transaction description.
In a fictional worksheet, record 100 kWh before settlement, the assumed financial action and zero kWh afterward on separate lines. Do not jump from the last line to a claim that the utility simply took the balance.
Use forfeiture only when the actual rule and account records support it. Precise wording helps a homeowner challenge an unexplained bill without turning an incomplete record into an unsupported accusation.
Current Dominion Solar Choice: November settlement
Dominion Energy South Carolina’s Residential Rate 5 Solar Choice rider, effective for bills from the first July 2026 cycle, provides monthly time-of-use netting and eligible excess carryforward. During November billing cycles, unused accumulated excess is paid at the company’s defined avoided cost and the excess-energy account is zeroed. The rider identifies that avoided cost as the off-peak winter energy credit in Rate PR-1. Credits do not offset the basic facilities charge.
Those provisions should not be shortened to all exports always receive avoided cost. The monthly credit application and remaining November surplus are distinct parts of the rider.
Identify whether your account is actually served under that rider before using the example. The utility’s program name, effective version and account history matter. A November billing cycle is also more precise than assuming one identical payment date for every household.
Santee Cooper illustrates a different credit arrangement
Santee Cooper’s DG-25 retail Distributed Generation Rider describes hourly netting and monthly credit handling. When the monthly bill results in a net customer credit, a credit of at least $50 is issued by check; a smaller credit is applied to the next billing month.
That is different from assuming a full-retail annual kWh bank with a universal reset date. Keep the monetary credit and its payment threshold separate from an energy-balance ledger.
For a real account, confirm the applicable rider and current statement. Do not copy Dominion’s November treatment into a Santee Cooper calculation merely because both properties are in South Carolina.
The Dominion-versus-Santee Cooper comparison retains the broader program comparison. This definition uses the contrast to show why the same settlement vocabulary can conceal different billing mechanics.
Current Duke Energy Carolinas RSC is not a universal annual bank
The Duke Energy Carolinas South Carolina Residential Solar Choice rider, effective January 1, 2026, describes monthly netting within time-of-use periods and monthly credits for net excess energy. Its minimum-bill provisions distinguish the credit from the minimum-charge calculation.
Do not replace those terms with a broad claim that all Duke South Carolina customers bank retail credits until a March payout. Current RSC, legacy or transition accounts and another legal utility can require different documents.
In particular, Duke Energy Carolinas and Duke Energy Progress should not be treated as interchangeable tariff names. Ask the provider to confirm the exact account arrangement and current rider.
The definition remains the same: understand the balance, period and treatment. The actual implementation comes from the applicable account rules rather than a national description of the utility brand.
Why online true-up explanations often describe California
Search results frequently discuss annual solar settlements from another market. Read the provider and program names before adopting the explanation for a South Carolina bill.
For example, Southern California Edison’s NEM billing explanation describes a 12-month settlement and distinguishes annual and monthly billing options. It also explains that eligible surplus compensation has conditions. This is a California program example, not an instruction for a South Carolina account.
An explanation can help illustrate the general term without supplying your local rule. Keep the conceptual lesson and geographic applicability separate.
If a forum answer says everyone receives a yearly bill or can change the anniversary date, verify that claim against your own tariff and utility instructions. Do not import the answer merely because the commenter also owns solar panels.
Amount due now and accumulated charges are different fields
Imagine a fictional statement showing $40 due now and $300 in a cumulative energy-charge field. Adding them to produce $340 may double count an amount or combine different periods; the labels and statement rules must be checked first.
Ask which field represents the current payment obligation and which is informational or settled later under the actual arrangement. Preserve dates and explanations with the numbers.
A payment worksheet should show amounts due on each date, not simply add every dollar figure on the statement. If the utility offers a separate cumulative tracker, ask how payments, credits and adjustments affect it.
This distinction helps prevent both underpayment and exaggerated estimates. It also explains why a small current bill does not automatically prove that a later accumulated balance is zero.
Credits may not eliminate all monthly charges
For a fictional account, assume a $10 monthly charge that cannot be offset by its energy credits. Twelve months would total $120 even if the eligible energy-charge balance were fully offset.
That example does not identify any actual provider’s charge. It illustrates why the bill needs separate energy and other-charge lines rather than a single net-kWh calculation.
Ask which actual charges can be offset, which remain payable and whether a minimum calculation applies. Use the tariff’s treatment rather than adding a minimum charge on top of everything by assumption.
A true-up discussion should therefore include obligations that continue during the period. The existence of credits or a future payment does not prove that every monthly amount due disappears.
Time-of-use balances should retain their buckets
A time-of-use rate assigns prices to defined periods. When a tariff also tracks credit balances by period, a single combined annual kWh number can hide how those credits may be used.
For a fictional ledger, imagine 100 kWh in one period and 200 kWh in another. The sum is 300 kWh, but that sum does not establish a common value or unrestricted application against all future usage.
Preserve the separate columns until the actual tariff tells you how they interact. If a rule permits an ordered transfer or application, follow that order and retain the supporting calculation.
The same approach applies at settlement. Record the quantities and the rule for each relevant bucket before converting a remaining balance to money. A neat spreadsheet total is not enough if the underlying restrictions were removed.
Solar production is not the same as exported electricity
The inverter’s generation record and the utility’s export record measure different parts of the energy flow. Electricity consumed at the property need not appear as exported energy on the meter.
For a fictional hour, suppose solar produces 5 kWh, the home directly uses 3 kWh and 2 kWh crosses the boundary to the grid. The production record is 5 kWh; the assumed export is 2 kWh.
Use the solar self-consumption definition to understand that distinction. Do not compare an annual inverter total directly with a credit ledger and conclude that the utility omitted the difference.
For a real discrepancy, align dates, units, meter definitions and system changes before asking for review. Missing monitoring data and different reporting periods should be identified rather than filled with guessed exports.
Matching annual production and consumption does not prove a zero bill
Assume a fictional home consumes 12,000 kWh over a year and its solar system also produces 12,000 kWh. Those matching annual totals establish only the assumed energy comparison.
They do not establish when the household imported electricity, how much solar was exported, which credits were eligible or what remained at settlement. They also do not eliminate fixed or other charges.
The energy offset definition explains why a production-to-consumption percentage is not a complete utility bill forecast. A proposal needs the actual tariff and timing assumptions as well.
Request a model that shows the relevant netting periods, carried balances and settlement treatment. The result should reconcile energy flows and financial effects without valuing every generated kWh at the same assumed retail rate.
First-year timing can change the period being compared
An installation beginning operation partway through a settlement period should not be compared casually with a full-year forecast. Identify the actual permission-to-operate date, billing dates and period covered by the statement.
For a fictional model, six months of operation and twelve months of modeled generation are different inputs. A smaller observed quantity is not, by itself, evidence of an equipment defect or billing error.
The permission-to-operate definition explains the utility approval milestone. Use the actual records rather than the sales agreement date to understand when the relevant operation period began.
Ask the utility how the account’s settlement period applies to the first statement sequence. Do not assume the installation anniversary automatically sets or changes the true-up date.
Reconcile a settlement statement with a simple record stack
Collect the applicable rider, the statements covering the period, meter import/export records if available, payment history and any utility adjustment explanation. Keep monitoring data as a separate equipment record.
Use one row per billing cycle, with opening balance, eligible additions, applied credits, adjustments, payments and closing balance. Preserve the utility’s labels rather than inventing a different ledger that cannot be traced back to the bill.
At settlement, identify the remaining quantity, rate source, financial action and subsequent balance. If something does not reconcile, prepare a specific question containing the dates and document references.
This method produces a reviewable issue. It is more useful than saying my panels made enough energy, so the bill must be wrong, because it identifies the actual accounting step that needs clarification.
What should you do when records are incomplete?
Label a missing value as missing. Do not estimate an opening credit balance from inverter production or use a neighboring household’s statement to fill the gap.
Ask the utility for the relevant statement or account explanation. If the available data cover only part of the period, say so in the comparison and keep full-year conclusions provisional.
For a fictional file, an unexplained 100 kWh difference could involve an omitted cycle, adjustment or application rule. The arithmetic identifies the difference; it does not identify the cause.
Record the response and update the worksheet when evidence arrives. Keeping a visible unresolved question is better than forcing the numbers to match through an undocumented adjustment.
Can a battery reduce a true-up balance or bill?
A battery question requires an energy-flow and cost comparison under the actual tariff. Do not assume storage eliminates settlement charges or turns every surplus kWh into retail-value savings.
For a fictional comparison, moving some solar use to a later hour could change imports or exports. The financial effect depends on the affected quantities, applicable values, losses and operating assumptions, while equipment and financing costs remain separate.
The load profile definition helps frame when consumption occurs. Battery backup priorities can also differ from electricity-bill objectives, so a model should state what the system is intended to do.
Use actual proposal scope and current billing rules before attributing a benefit to storage. An unfavorable settlement result is a reason to investigate the calculation, not proof that a battery is automatically the best purchase.
What a solar proposal should show about settlement
A useful proposal identifies the legal utility, base rate, solar rider, customer cohort and source version. It then shows energy-flow assumptions, credit units, permitted applications, settlement period and treatment of any remainder.
Ask which charges continue and how the forecast separates direct self-consumption, credited exports and settlement value. Compare those assumptions consistently across offers.
The solar quote comparison guide covers the broader review. Use this definition to inspect one specific part of the financial model rather than replacing equipment, roof, electrical and contract checks.
For a planned South Carolina system, request a free solar assessment to establish the project scope and consumption information needed for a proposal. Confirm the current account and settlement rules with the serving utility. An assessment does not guarantee a payout, zero bill or permission to change a settlement date.
Frequently asked questions about net metering true-up
Is every solar true-up an annual bill?
Check the program. A settlement can concern unused energy, accumulated charges or another balance. Some arrangements handle net excess on monthly bills. The label does not establish one universal annual payment obligation.
Do unused credits always become cash at the retail rate?
The actual tariff determines whether a remaining balance is paid, carried, reset or otherwise treated, and how it is valued. Do not attach the import price to a remaining energy quantity without the applicable rule.
Is there one true-up date for South Carolina?
Different utilities and account arrangements use different billing mechanics. Identify the provider, rider, customer cohort and settlement provision. A date from another household or a national guide is not proof of your account’s rule.
Does a reset mean the utility kept my credits?
Read the accompanying financial action. A balance can be zeroed after a settlement payment or another documented treatment. Ask for the ledger and rule before interpreting the final displayed number.
Why is there still a bill when annual generation matches usage?
Annual totals do not establish timing, exports, credit restrictions, settlement values or remaining charges. Review the energy flows and financial calculation under the actual tariff rather than treating a production percentage as a zero-bill promise.
Can I choose a different settlement month?
Ask the utility whether the applicable program permits any change and what conditions apply. This glossary does not establish that option. Do not use another market’s anniversary-date discussion as authority for a local account.
Should I add current amount due to cumulative charges?
Read the labels and dates first. Those fields may describe different purposes or include overlapping amounts. Request the utility’s explanation of what must be paid now and what is reconciled later before adding them.
Does a battery guarantee that settlement charges disappear?
No such outcome is established by the settlement definition. Compare storage cost, operating assumptions, energy flows and actual tariff treatment. Backup and electricity-bill objectives also need to be stated separately.
Sources and methodology
Sources reviewed October 6, 2026: Dominion Energy South Carolina’s July 2026 Residential Rate 5 Solar Choice rider; Santee Cooper DG-25; Duke Energy Carolinas’ January 2026 South Carolina RSC rider; and Southern California Edison’s NEM billing explanation. The California source illustrates terminology and is not applied to South Carolina customers.
Numerical examples are original fictional calculations with explicit assumptions. They explain ledger units, timing and conversion rather than estimate a household’s bill. Current account rules, meter records and utility confirmation are required for a customer-specific review. The linked existing guides retain utility comparisons and purchase decisions.