A power purchase agreement, or PPA, is a contract to purchase electricity from a specified generating system under agreed pricing and other terms. For a residential solar proposal, it commonly separates equipment ownership from the homeowner’s electricity purchase.
The important buying question is what obligation the contract creates, not only its first price per kilowatt-hour. Identify the electricity being billed, the future price schedule and what happens when the home or equipment needs change.
Our solar financing overview and loan-versus-lease guide retain the broader financing decision. This entry explains the contract entity. It does not confirm a PPA product offered by Sunburst or availability for a particular state, account or property. All numerical examples are original hypotheticals, not offers or savings promises.
What are you buying under a PPA?
You are buying an agreed electricity quantity under the contract. The agreement should identify the generating system, seller, buyer, measurement method and pricing provisions.
In a typical residential third-party arrangement, another entity owns the equipment while the homeowner pays for electricity. The exact responsibilities, rights and payment basis still depend on the agreement. Do not assume that a sales label supplies every term.
DOE’s consumer guide distinguishes an equipment-use payment from a PPA purchase priced per kilowatt-hour. That supports the basic distinction, not the availability or value of an individual contract. DOE consumer solar guide.
Ask whether the proposed contract bills all production, a defined metered quantity or another specified basis. “You pay for solar” is incomplete without that answer. The quantity used to calculate the PPA invoice may differ from the solar energy your household uses directly.
How does a PPA differ from a lease, loan or cash purchase?
The main difference is the subject of the payment. A PPA buys electricity. A lease pays for use of equipment under its terms. A loan finances an equipment purchase, while a cash purchase pays for the agreed ownership scope without that loan.
| Structure | Main payment subject | Separate question to verify |
|---|---|---|
| PPA | Contractually defined electricity | Quantity, price and ownership terms |
| Equipment lease | Use of the installed equipment | Payment schedule and use obligations |
| Solar loan | Financed purchase obligation | Cash price, finance terms and ownership |
| Cash purchase | Purchase and installed scope | Included work, warranties and service |
These are introductory distinctions. A real agreement can include additional fees, guarantees and conditions. Compare the actual documents rather than deciding from the name alone.
Our loan, lease and PPA comparison owns that purchase comparison. The glossary’s narrower job is to explain why an electricity-based contract payment needs a different calculation from a fixed equipment-use payment.
No ownership structure automatically establishes tax eligibility, lower total cost or easier home sale. Those issues require separate current verification and the exact contract.
Which electricity quantity determines the invoice?
Start with the meter and billing definition. Identify where electricity is measured, the billing period and how readings are made available. A production meter and the utility’s import/export record need not describe the same flow.
Ask how the contract treats estimation, missing readings, later corrections and equipment downtime. Those provisions can affect the invoice independently of the household’s utility bill.
For a fictional simple example, a contract bills 700 kWh at $0.12/kWh for one period. The electricity charge is $84 before any separate contract fees. The example assumes that quantity and price apply under the invented agreement.
It does not mean the home avoided buying 700 kWh from the utility. Some generation could be exported, and some household consumption could still be imported at other times. The PPA charge and the utility-bill effect therefore need separate records.
Before accepting a savings comparison, ask the bidder to connect production, direct use, exports and remaining imports through a consistent energy-flow model.
Why does direct use versus export change the comparison?
Electricity used directly on site can avoid an import under the applicable utility arrangement. Exported energy receives its own treatment. The values can differ, so paying one PPA price for production does not establish one uniform value for every generated kilowatt-hour.
Consider an original fictional period with 700 kWh billed by the PPA. Assume 400 kWh is used directly and 300 kWh is exported. At an invented $0.20/kWh avoided import value and $0.05/kWh export credit, the combined energy value is $80 + $15 = $95.
At the fictional $84 PPA electricity charge, the gross difference is $11 before other costs and bill components. The calculation is conditional on the quantities, prices and treatment actually matching the agreement and account.
Now keep production and PPA charge unchanged, but assume only 200 kWh is used directly and 500 kWh is exported. The energy value becomes $40 + $25 = $65, giving $65 − $84 = −$19 before other items.
These two examples show why the same production-priced contract can have different outcomes for different household timing. They are not current utility rates or a forecast for a South Carolina home. Read solar self-consumption and solar export rate for those separate concepts.
Will the PPA replace the utility bill?
Do not assume that it will. The household can still import electricity when solar does not meet demand, and applicable utility bill components may remain. The contract invoice is an additional obligation to model alongside the utility account.
Use a baseline utility bill and a revised case containing both the PPA and utility amounts. State the included charges, credits and fees. Comparing the PPA invoice alone with the old total utility bill can overstate the result.
For a fictional bookkeeping example, suppose a baseline bill is $150. A modeled revised utility bill is $70, and the PPA invoice is $84. The combined amount is $154, which is $4 above the baseline before any other differences.
This does not contradict a lower PPA unit price. The quantities and remaining charges determine the total. A price comparison without the complete flows is insufficient.
The solar value guide retains the broader investment decision. For a PPA case, request a combined payment model and disclose uncertain future rates rather than assuming every utility price rises at a convenient fixed percentage.
What is an escalator?
An escalator is a contract provision that changes a specified payment or price according to an agreed schedule or formula. Read what changes, when it changes and which starting value the formula uses.
A fixed annual percentage increase in a price compounds when it applies to the prior year’s price. It is not the same as adding that percentage of the original price each year.
For an original fictional PPA, assume a first-year price of $0.12/kWh and a 3% annual increase at each anniversary. Year two is $0.12 × 1.03 = $0.1236/kWh. Year three is $0.12 × 1.03² = $0.127308/kWh.
At a constant fictional 10,000 billed kWh per year, those prices produce electricity charges of $1,200, $1,236 and $1,273.08. The three-year sum is $3,709.08, excluding other fees. Actual billed quantities may differ.
The example is not a offered rate or a claim that every PPA has an escalator. Our solar escalator guide retains the deeper payment-schedule comparison. For a PPA, distinguish the unit-price schedule from the energy quantity multiplied by that price.
Does a fixed PPA price guarantee savings?
No. A fixed price removes one source of price change in the contract, but it does not determine household production, direct use, export treatment, remaining imports or the utility’s future prices.
Even a zero-escalator agreement needs a complete comparison. The fixed obligation may apply to energy that has a lower alternative value, and separate fees or exit conditions can affect the decision.
Ask for several utility and usage cases rather than one optimistic trajectory. A household can change schedules, move or add equipment. A model should show how those changes affect the value of production being purchased.
Likewise, do not treat a variable or escalating agreement as automatically unsuitable. The decision needs the actual schedule, risks and alternatives. The glossary explains the mechanism; the buying guide and a current contract review establish the comparison.
A useful proposal separates known contractual prices from uncertain external prices. This makes it clear which amounts are commitments and which are assumptions.
Why does South Carolina require a careful distinction?
South Carolina’s equipment-leasing framework should not be treated as blanket authorization for a residential electricity-priced PPA. The current official Chapter 111 regulations distinguish the lease of a renewable energy facility from metered-output payments.
Section 111-31(D)(1)(a) states that lease payments must not be calculated upon metered output. The related provision addresses energy sales within that leasing framework. South Carolina ORS regulations, Chapter 111.
This is a bounded distinction, not a claim that every agreement called a PPA in every context is prohibited. Utility-scale purchases, other authorized structures and residential equipment leases should not be collapsed into one category.
ORS maintains solar leasing information. Use current official resources and qualified contract advice to verify the proposed structure, seller and applicable requirements. An old national financing brochure or a utility’s purchase from a solar farm does not establish residential product availability.
This glossary does not confirm that Sunburst offers a PPA. Any assessment should identify the products actually available for the property before presenting one as a purchase option.
What does contract length change?
The term defines how long the parties’ obligations apply, subject to the agreement’s conditions. Read the start event, end date and any extensions rather than assuming the signing date starts every payment obligation.
Ask what happens if installation or operation begins later than expected. Identify the conditions that trigger billing and whether any amounts are due before production. The answer must come from the agreement.
A long term should be compared with the household’s plans for the property. Roof work, a sale, refinancing or a changed electricity need may occur before the agreement ends. The relevant question is how the contract handles those events.
Do not equate the term with equipment lifespan or warranty coverage. A contract can continue while individual components have separate warranties or require service. Record those obligations alongside the payment schedule.
For a buyer, a complete calendar of obligations is more useful than a single term length. Include scheduled increases, decision windows and events that require notification or consent.
What happens when you sell the house?
Read the transfer provisions before signing, even if you expect to stay. A sale can introduce buyer approval, consent, notice, fees, a purchase option or another contractual requirement.
The FTC advises consumers to review how solar agreements affect home sales and whether a buyer must meet conditions to take over the contract. That is a document-review principle, not a promise that a particular buyer will accept an agreement. FTC solar consumer guidance.
Ask which party must act, what documents are required and whether any quoted transfer process depends on third-party approval. A salesperson’s statement that transfer is easy should be supported by the written terms.
Keep equipment ownership separate from prepaid electricity. Paying a remaining obligation in advance does not necessarily transfer title to the system. The agreement should define the consequence of each available transaction.
For an existing home purchase, obtain the actual agreement and current obligation from the responsible parties. A seller’s remembered monthly payment is insufficient to establish escalation, future fees or exit terms.
Are buyout, prepayment and termination the same?
No. A buyout can concern acquiring equipment under a defined option. Prepayment can concern paying an obligation early. Termination concerns ending the agreement under its conditions. The names and consequences need the actual contract.
Ask for the calculation method, timing, fees and resulting ownership or service duties for each option. If a price is to be determined later, record that uncertainty rather than inventing a future buyout amount.
A fictional offer to prepay future electricity invoices does not establish that the homeowner owns the panels afterward. Conversely, an equipment purchase option may change maintenance and warranty arrangements as well as payment obligations.
Do not use a remaining-payment sum as a buyout estimate unless the agreement says that is the method. The contract can define a different calculation or decision window.
Keep these options in the same comparison worksheet so a homeowner can see the consequences. A lower early invoice may be less appealing if the household’s likely exit has a substantial unresolved cost.
Who handles maintenance, roof work and equipment problems?
Identify the written service duties, exclusions and response process. Third-party ownership does not establish that every maintenance task or roof expense is included without additional conditions.
Ask what happens if the roof needs repair, who arranges removal and reinstallation, who pays and how production or billing is treated during that work. The answers can materially affect a long-term agreement.
The FTC recommends reviewing included warranties, repairs, maintenance and roof-related terms. It does not establish the service promise of an individual provider. FTC contract-review guidance.
Also identify the parties responsible if equipment ownership, servicing or the contract is transferred to another entity. A current provider’s sales presentation does not explain every future assignment.
Our quote comparison guide retains the broader installed-scope review. For a PPA, include service and access obligations as contract terms alongside the electricity price.
What should a production guarantee explain?
A performance statement needs a defined quantity, period, measurement method and remedy. A promise that panels are reliable is not a contractual production guarantee.
Ask whether the agreement guarantees a minimum quantity, how exclusions are handled and what happens if the stated threshold is missed. The remedy could differ from a full refund or replacement; read it rather than assume.
Separate equipment performance from financial savings. Meeting a production guarantee does not establish that every kilowatt-hour avoided a high-value utility import. The household’s timing and tariff still matter.
Likewise, lower production can affect both PPA invoices and utility imports. The combined financial result requires both effects rather than counting only one. A model should state how downtime and billing adjustments are handled.
Do not turn a manufacturer’s panel warranty into the provider’s production promise. They are different documents with different parties, measurements and conditions.
Who owns environmental attributes and receives incentives?
Request the agreement’s allocation of renewable energy attributes and any claimed incentives. Equipment ownership, electricity purchase and environmental attributes are separate matters to verify.
This glossary assigns no current tax credit or incentive entitlement to the homeowner or provider. Eligibility depends on the applicable program, ownership structure, dates and other requirements. General educational sources can contain historical tax language that should not be imported into a current proposal.
If a price is justified by a provider incentive, ask how that assumption enters the quoted terms and what happens if it changes. A marketing reference to a benefit is not proof that the homeowner receives it.
Similarly, buying electricity does not automatically establish ownership of every associated renewable certificate or a right to make every environmental claim. Read the actual allocation and obtain appropriate advice where the claim matters.
The financing and incentives overview is the route to current site guidance. Keep the contract definition independent of an unverified credit percentage.
A contract worksheet for the electricity-purchase obligation
Request the actual agreement and disclosures, then complete the following record. Do not fill unknowns from a sales estimate or another provider’s contract.
| Field | What to identify |
|---|---|
| Parties and system | Seller, buyer, owner and specified equipment |
| Billing quantity | Meter, energy definition and billing period |
| Price schedule | Initial price and every change formula |
| Additional amounts | Fees, minimums and other obligations |
| Start and term | Billing trigger, duration and extensions |
| Service | Maintenance, repairs, roof access and exclusions |
| Performance | Guaranteed quantity, conditions and remedy |
| Property events | Sale, transfer, refinancing and required consent |
| Exit and end | Prepayment, purchase, termination and removal options |
| Availability | Current authorization and provider offering for the property |
A comparison should preserve the same household usage and utility assumptions across alternatives. Our loan-versus-lease guide covers that wider decision; this worksheet isolates the PPA terms needed as inputs.
How should a homeowner compare the total obligation?
Use the full price schedule and a credible billed-energy sequence. A first-month invoice is not a total-cost measure, and a constant annual production assumption should be labeled rather than treated as certain.
Model the remaining utility bill separately. Include export treatment, direct use, imports and the applicable bill components. Then identify other contract amounts and any relevant property-event costs.
Compare supported alternatives using the same time horizon and assumptions. If one case assumes a favorable utility increase and another does not, the apparent advantage may come from inconsistent modeling rather than the financing structure.
Keep uncertainty visible. A future equipment purchase price, property-transfer outcome or utility rate may not be known. Show cases or unresolved inputs instead of presenting a single precise prediction as guaranteed.
What should you bring to a solar assessment?
Bring the complete proposal, draft agreement, disclosures, current utility bills and any usage data. Include plans for moving, roof work or major new loads that could affect the comparison.
Ask which financing structures are actually offered for the property and whether the quoted terms match the written documents. Separate an educational explanation of PPAs from a confirmed available product.
A free Sunburst assessment can start a comparison of the solar scope and available financing options. It is not confirmation that a PPA is offered. The useful outcome is a clear ownership and payment structure supported by actual documents and current account information.
Power purchase agreement FAQs
Is a solar PPA a loan?
No. A PPA purchases contractually defined electricity, while a loan finances a purchase obligation. Ownership, service and payment terms need their own review. Do not treat a PPA unit price as an APR or a loan payment.
Is a PPA the same as an equipment lease?
No. Their payment subjects differ. A PPA generally uses an electricity quantity, while a lease concerns equipment use. South Carolina’s equipment-leasing framework specifically separates lease payments from metered output; availability of a different structure needs verification.
Am I billed only for the solar energy I use directly?
Do not assume that. Read the contract’s billing quantity and meter definition. A production-based obligation can differ from the household’s directly consumed quantity, so exported energy must be evaluated separately in the utility comparison.
Does a lower price per kWh prove the agreement saves money?
No. Billed quantities, direct use, export value, remaining imports, other charges and future terms matter. Compare the combined PPA and utility case with a credible baseline instead of comparing two headline unit prices alone.
Does every PPA have an annual escalator?
No universal rule should be assumed. Read the exact price schedule. If it changes, identify the formula and timing. A fixed price still needs a complete utility and contract comparison.
Do I own the system after prepaying the agreement?
Not necessarily. Prepayment and equipment purchase are different transactions. The contract should explain whether ownership changes and what happens to service duties. Do not infer title from an early payment alone.
Can I transfer a PPA when selling my home?
The agreement controls the available process and conditions. Obtain the actual terms, current obligation and required approvals. A generic assurance that a buyer can take over does not establish consent, qualification or costs.
Does Sunburst offer a PPA?
This glossary does not confirm that product availability. Ask the assessment team which financing structures are currently offered for the property. An explanation of a solar contract is not an offer or authorization for a particular account.
Sources and methodology
Sources were reviewed on October 6, 2026. DOE supports the electricity-purchase versus equipment-use distinction. FTC supports the bounded contract-review questions; historical tax language and general claims about future utility prices are not adopted.
The current official South Carolina Chapter 111 regulations were reviewed for the equipment-leasing distinction. That framework is not used to declare every form of PPA prohibited or to confirm a residential PPA product. Utility-scale agreements and old national brochures do not establish homeowner availability.
All arithmetic examples are original fictional assumptions. No offered rate, provider partnership, legal entitlement, incentive, savings promise, first-party result or future buyout amount is asserted. The exact agreement and current state/account requirements govern a real decision.