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Net Metering Credit

Compute net units and monthly credit / payable.

Financial

Inputs (SI units)

Determines how import and export energy are priced and whether unused credit rolls over.

Gross PV energy produced in the month.

Total site load in the month.

Rate charged for energy imported from the grid.

Rate credited per kWh exported — ignored under feed-in tariff, where gross export is used instead.

Only used in the feed-in tariff scheme: all PV generation is exported and paid at this rate, and 100% of consumption is billed at the import tariff separately.

Flat monthly charge, always payable.

Charge based on peak demand, unaffected by the settlement scheme.

Banked kWh credit carried in from the previous month (net metering scheme only).

Results

Final monthly bill
150
Monthly savings vs no solar
5,850
Annual export credit
0
Annual savings (approx.)
70,200
Import energy
0 kWh/mo
Export energy
150 kWh/mo
Rollover credit carried forward
150 kWh
✓ PASS — Final bill is consistent with the chosen settlement scheme.

Engineering Recommendations

  • →The settlement rule is fully determined by the scheme you select — no single formula is hardcoded across net metering, net billing, feed-in tariff and custom schemes.
  • →Confirm your DISCOM/utility's actual rollover period (monthly, annual, or indefinite) for banked kWh credit.
  • →Engineering-grade preliminary calculation. Final design must be verified against project-specific site conditions, manufacturer datasheets, applicable standards and utility requirements.

Detailed Calculation Log

Scheme rule applied: Surplus is banked in kWh (not cash) and rolls forward to offset future import.
Component | Value
Import energy (kWh) | 0
Export energy (kWh) | 150
Import cost | 0
Export credit | 0
Fixed charge | 150
Demand charge | 0
Rollover credit (kWh) | 150
Final bill | 150

Save & Load Project

Designs are stored privately in this browser — nothing is uploaded.

Engineering Formula

  • Net = Gen − Cons
  • If Net ≥ 0: credit = Net × ExportRate
  • If Net < 0: bill = |Net| × Tariff

Standard net-metering: consumption first cancels generation (banked at retail tariff), surplus is bought back at feed-in rate.

Step-by-step Calculation

  1. 1.Scheme selecteduser inputnet-metering
  2. 2.Import energyper scheme rule0 kWh
  3. 3.Export energyper scheme rule150 kWh
  4. 4.Import costImport energy × import rate0
  5. 5.Export creditExport energy × applicable rate0
  6. 6.Rollover credit carried forwardbanked kWh (net metering only)150 kWh (≈ 1,350 if drawn at retail rate)
  7. 7.Final monthly billImport cost + fixed + demand − export credit150

How to use this calculator: Net Metering Credit

Compute net units and monthly credit / payable. The example below is calculated by this page's real engine from the displayed inputs.

  1. 1Confirm that the Net Metering Credit matches the quantity or design check you need.
  2. 2Enter Monthly PV generation, Monthly consumption, and Import (retail) tariff using the units printed beside each field.
  3. 3Select the applicable Settlement scheme options; these choices change the calculation method or factors.
  4. 4Calculate, then follow the substituted equations in the worked example and compare the result with any stated limit.
  5. 5Read the assumptions, warnings and cited references before using the result for a financial, medical or engineering decision.

Input guide and example values

Use values from the same measurement basis and time period. Conditional fields appear only when the related option is selected.

InputExample valueWhy it matters
Settlement schemeNet metering (kWh banking)Determines how import and export energy are priced and whether unused credit rolls over.
Monthly PV generation800 kWh/moGross PV energy produced in the month.
Monthly consumption650 kWh/moTotal site load in the month.
Import (retail) tariff9 currency/kWhRate charged for energy imported from the grid.
Export rate3 currency/kWhRate credited per kWh exported — ignored under feed-in tariff, where gross export is used instead.
Feed-in tariff rate (gross export)6 currency/kWhOnly used in the feed-in tariff scheme: all PV generation is exported and paid at this rate, and 100% of consumption is billed at the import tariff separately.
Fixed charge150 currency/moFlat monthly charge, always payable.
Demand charge0 currency/moCharge based on peak demand, unaffected by the settlement scheme.
Opening rollover credit0 kWhBanked kWh credit carried in from the previous month (net metering scheme only).

Formula inputs & variables for Net Metering Credit

These are the named quantities used by this calculator. When the source formula does not define a mathematical symbol, OneCalcApp keeps the real input label instead of inventing one.

Variable / inputUnitMeaning in this calculation
Settlement scheme—Determines how import and export energy are priced and whether unused credit rolls over.
Monthly PV generationkWh/moGross PV energy produced in the month.
Monthly consumptionkWh/moTotal site load in the month.
Import (retail) tariffcurrency/kWhRate charged for energy imported from the grid.
Export ratecurrency/kWhRate credited per kWh exported — ignored under feed-in tariff, where gross export is used instead.
Feed-in tariff rate (gross export)currency/kWhOnly used in the feed-in tariff scheme: all PV generation is exported and paid at this rate, and 100% of consumption is billed at the import tariff separately.
Fixed chargecurrency/moFlat monthly charge, always payable.
Demand chargecurrency/moCharge based on peak demand, unaffected by the settlement scheme.

How the Net Metering Credit works

The Net Metering Credit uses Settlement scheme, Monthly PV generation, Monthly consumption, Import (retail) tariff, Export rate, Feed-in tariff rate (gross export), Fixed charge, Demand charge, and Opening rollover credit to calculate Final monthly bill, Monthly savings vs no solar, Annual export credit, Annual savings (approx.), Import energy, Export energy, and Rollover credit carried forward. Its engine applies Net = Gen − Cons; the worked values below come from that same live calculation rather than a separately typed example.

With Settlement scheme Net metering (kWh banking), Monthly PV generation 800 kWh/mo, Monthly consumption 650 kWh/mo, Import (retail) tariff 9 currency/kWh, Export rate 3 currency/kWh, Feed-in tariff rate (gross export) 6 currency/kWh, Fixed charge 150 currency/mo, Demand charge 0 currency/mo, and Opening rollover credit 0 kWh, the main worked-example result is Final monthly bill = 150.

How each Net Metering Credit input is used

Settlement scheme

The Net Metering Credit worked example selects “Net metering (kWh banking)”. Available choices include Net metering (kWh banking), Net billing (export at separate rate), Feed-in tariff (gross export), and Custom (manual import/export rates). This selection may change the method or factor used by the engine, so choose the option that matches the real case.

Monthly PV generation

The Net Metering Credit worked example uses Monthly PV generation = 800 kWh/mo. This value is passed directly into the calculation, with an allowed minimum 0. Gross PV energy produced in the month.

Monthly consumption

The Net Metering Credit worked example uses Monthly consumption = 650 kWh/mo. This value is passed directly into the calculation, with an allowed minimum 0.01. Total site load in the month.

Import (retail) tariff

The Net Metering Credit worked example uses Import (retail) tariff = 9 currency/kWh. This value is passed directly into the calculation, with an allowed minimum 0.01. Rate charged for energy imported from the grid.

Export rate

The Net Metering Credit worked example uses Export rate = 3 currency/kWh. This value is passed directly into the calculation, with an allowed minimum 0. Rate credited per kWh exported — ignored under feed-in tariff, where gross export is used instead.

Feed-in tariff rate (gross export)

The Net Metering Credit worked example uses Feed-in tariff rate (gross export) = 6 currency/kWh. This value is passed directly into the calculation, with an allowed minimum 0. Only used in the feed-in tariff scheme: all PV generation is exported and paid at this rate, and 100% of consumption is billed at the import tariff separately.

Fixed charge

The Net Metering Credit worked example uses Fixed charge = 150 currency/mo. This value is passed directly into the calculation, with an allowed minimum 0. Flat monthly charge, always payable.

Demand charge

The Net Metering Credit worked example uses Demand charge = 0 currency/mo. This value is passed directly into the calculation, with an allowed minimum 0. Charge based on peak demand, unaffected by the settlement scheme.

Opening rollover credit

The Net Metering Credit worked example uses Opening rollover credit = 0 kWh. This value is passed directly into the calculation, with an allowed minimum 0. Banked kWh credit carried in from the previous month (net metering scheme only).

Net Metering Credit formulas and result interpretation

Formula 1: relationship used

In the Net Metering Credit, Net = Gen − Cons. The quantities in this relationship come from the named inputs or from an earlier calculation step shown in the worked example.

Formula 2: relationship used

In the Net Metering Credit, If Net ≥ 0: credit = Net × ExportRate. The quantities in this relationship come from the named inputs or from an earlier calculation step shown in the worked example.

Formula 3: relationship used

In the Net Metering Credit, If Net < 0: bill = |Net| × Tariff. The quantities in this relationship come from the named inputs or from an earlier calculation step shown in the worked example.

Final monthly bill

For the displayed Net Metering Credit worked example, Final monthly bill is 150. Verify Settlement scheme, Monthly PV generation, and Monthly consumption and their units before relying on this output.

Monthly savings vs no solar

For the displayed Net Metering Credit worked example, Monthly savings vs no solar is 5,850. Verify Settlement scheme, Monthly PV generation, and Monthly consumption and their units before relying on this output.

Annual export credit

For the displayed Net Metering Credit worked example, Annual export credit is 0. Verify Settlement scheme, Monthly PV generation, and Monthly consumption and their units before relying on this output.

Annual savings (approx.)

For the displayed Net Metering Credit worked example, Annual savings (approx.) is 70,200. Verify Settlement scheme, Monthly PV generation, and Monthly consumption and their units before relying on this output.

Import energy

For the displayed Net Metering Credit worked example, Import energy is 0 kWh/mo. Verify Settlement scheme, Monthly PV generation, and Monthly consumption and their units before relying on this output.

Export energy

For the displayed Net Metering Credit worked example, Export energy is 150 kWh/mo. Verify Settlement scheme, Monthly PV generation, and Monthly consumption and their units before relying on this output.

Rollover credit carried forward

For the displayed Net Metering Credit worked example, Rollover credit carried forward is 150 kWh. Verify Settlement scheme, Monthly PV generation, and Monthly consumption and their units before relying on this output.

Net Metering Credit accuracy, checks and limitations

  • Net Metering Credit units check: confirm Settlement scheme, Monthly PV generation (kWh/mo), Monthly consumption (kWh/mo), Import (retail) tariff (currency/kWh), Export rate (currency/kWh), Feed-in tariff rate (gross export) (currency/kWh), Fixed charge (currency/mo), Demand charge (currency/mo), and Opening rollover credit (kWh) before calculating.
  • Net Metering Credit result check: compare Final monthly bill, Monthly savings vs no solar, Annual export credit, Annual savings (approx.), Import energy, Export energy, and Rollover credit carried forward with the substituted formula steps and the displayed rounding precision.
  • Net Metering Credit: This is an estimate, not a lender offer. Verify fees, taxes, rate changes, eligibility and repayment terms in the official product documents.

Understanding the result

Read the main result together with supporting checks, assumptions, limits and intermediate values.

For a manual check, repeat the first equation, confirm the units and change one input at a time.

Common mistakes when using Net Metering Credit

  • Do not mix units for Monthly PV generation (kWh/mo), Monthly consumption (kWh/mo), Import (retail) tariff (currency/kWh). A unit mismatch changes the input magnitude even when the typed number looks reasonable.
  • Do not leave Settlement scheme on the default choice unless that choice matches the real scenario; the selected option can change the calculation path or factor.
  • Do not replace the displayed Net = Gen − Cons relationship with a different convention without also changing the underlying assumptions; compare like-for-like methods when checking the result.
  • Do not treat Final monthly bill = 150 from the worked example as a universal answer. It belongs to the displayed example inputs and must be recalculated for the actual case.

When the Net Metering Credit is useful

Net Metering Credit is designed for cases where Settlement scheme, Monthly PV generation, Monthly consumption, Import (retail) tariff are known and you need Final monthly bill, Monthly savings vs no solar, Annual export credit. The page keeps the live calculator, calculation method and worked example together so the result can be checked instead of treated as a black-box number.

Use the calculator for the scope described by its inputs and notes. The displayed method is Net = Gen − Cons. If the real project or decision needs factors that are not represented here, treat the result as an estimate and add the missing checks separately.

Settlement scheme and Monthly PV generation: what changes the answer

The worked example uses Settlement scheme = Net metering (kWh banking), Monthly PV generation = 800 kWh/mo, Monthly consumption = 650 kWh/mo, Import (retail) tariff = 9 currency/kWh. With those values, Final monthly bill is 150. Changing an input should be interpreted according to that field's unit, range, option and hint rather than by the number alone.

For this calculator, the main input roles are: Settlement scheme: Determines how import and export energy are priced and whether unused credit rolls over. Available choices include Net metering (kWh banking), Net billing (export at separate rate), Feed-in tariff (gross export), Custom (manual import/export rates). Monthly PV generation (kWh/mo): Gross PV energy produced in the month. Monthly consumption (kWh/mo): Total site load in the month. Import (retail) tariff (currency/kWh): Rate charged for energy imported from the grid.

How to sanity-check a Net Metering Credit result

Start by confirming the entered values and units, then compare the substituted working with the displayed formula or calculation steps. Pay particular attention to Final monthly bill, because it is the first worked-example output shown by the live engine.

Finally, compare the result with the assumptions, warnings and related calculators on this page. A nearby calculator can be useful as a cross-check when it measures the same workflow from a different input or output direction.

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Standards, source trail and limitations

References show the method used. Check the current local edition, amendments and project specification before a regulated decision.

Design Assumptions

  • • Bidirectional meter, monthly settlement.

Engineering Tips

  • ◆Some states bank credits for full FY — check regulation.

Warnings

  • ▲Gross metering pays only export tariff — verify contract.

Standards & References

Electricity Act 2003CERC RE regulations

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