A Power Purchase Agreement (PPA) offers Indian businesses a way to switch to solar electricity without necessarily investing heavily in their own solar plant. Instead of purchasing the solar asset outright, a business agrees to purchase the electricity generated by a developer-owned solar project at a predetermined tariff and under agreed contractual conditions.

For commercial and industrial businesses facing high electricity costs, this model can turn solar from a large capital investment into a predictable operating expense. However, the cheapest quoted PPA tariff is not automatically the best deal. Contract tenure, tariff escalation, minimum offtake, open-access charges, exit conditions, performance guarantees, and ownership provisions can substantially affect the real savings.

This 2026 guide explains how a solar Power Purchase Agreement works in India, the major PPA models, costs, advantages, risks, contract clauses, and how businesses can decide between a PPA and owning their solar plant.

Quick Note: Solar PPA economics and regulations vary significantly by state, DISCOM, project type, consumer category, contracted demand and open-access framework. All rates and examples in this guide should therefore be treated as illustrative unless supported by an actual project quotation.

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Power Purchase Agreement: Quick Answer

A Power Purchase Agreement is a contract under which a buyer agrees to purchase electricity from a power producer at predetermined commercial terms. In a solar PPA, a developer typically finances, develops, operates and maintains the solar project while the business purchases the electricity generated.

In simple terms: Developer invests in the solar plant → solar generates electricity → business purchases solar electricity → developer receives payment per unit. The arrangement can give a business access to renewable energy without requiring it to make the full upfront investment associated with purchasing a solar system.

PPA Parameter	Typical Structure
Solar Plant Investment	Developer/investor
Plant Ownership	Usually developer during PPA
Electricity Buyer	Business/off-taker
Payment	₹ per kWh supplied
O&M	Generally developer
Contract Duration	Long-term
Upfront Solar CAPEX	Low or potentially zero
Primary Benefit	Lower/predictable electricity cost
Main Risk	Long contractual commitment

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What Is a Power Purchase Agreement?

A Power Purchase Agreement is a legally binding contract governing the sale and purchase of electricity between a generator and an electricity buyer, commonly called the off-taker. The agreement defines how much electricity will be supplied, how it will be measured, what the buyer will pay, and how responsibilities and risks will be allocated.

In a solar arrangement, the generator is generally a renewable-energy developer or special-purpose entity that finances and owns the solar project. The commercial customer purchases the resulting electricity according to the PPA.

A comprehensive agreement may define:

• PPA tariff per kWh
• Contract duration
• Tariff escalation
• Billing methodology
• Minimum purchase obligations
• Expected generation
• Plant availability
• Performance standards
• Payment security
• Maintenance responsibilities
• Insurance
• Curtailment treatment
• Change-in-law provisions
• Default conditions
• Early termination
• Ownership transfer

This makes the Power Purchase Agreement much more than a discounted electricity-rate contract. It is the commercial framework governing a potentially 10–25-year energy relationship.

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Why Are Solar PPAs Important for Indian Businesses?

Commercial and industrial businesses consume large quantities of electricity, making energy a significant recurring operating expense. A solar PPA allows an organisation to address that cost without diverting substantial capital from its core operations.

Consider a manufacturer deciding between investing ₹2 crore into expanding production or putting that capital into a solar plant. Under outright solar ownership, the business needs to fund the project itself. Under an appropriate PPA structure, a developer provides the solar investment while the manufacturer purchases the resulting electricity. This can deliver several advantages.

Lower initial capital requirement

The developer normally funds the solar asset, allowing the business to preserve capital for machinery, inventory, expansion, technology or working capital.

Electricity savings can begin earlier

If the contracted solar tariff is below the business’s effective grid electricity cost, savings can begin once the project is commissioned.

More predictable energy costs

A fixed tariff or predetermined escalation schedule can improve long-term electricity cost visibility.

Reduced operational responsibility

Operation and maintenance generally remain the responsibility of the project owner under a conventional developer-owned PPA.

Supports renewable-energy objectives

Purchasing solar electricity can contribute to corporate decarbonisation and renewable-energy procurement objectives, subject to the treatment of renewable attributes under the contract.

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How Does a Solar Power Purchase Agreement Work?

A solar Power Purchase Agreement separates ownership of the solar asset from consumption of the electricity it produces. The developer owns the generating system while the business becomes the long-term electricity customer.

A typical transaction works through six stages.

1. Energy Assessment

The developer analyses the business’s:

• 12-month electricity consumption;
• sanctioned and connected load;
• maximum demand;
• operating hours;
• electricity tariff;
• daytime consumption;
• available rooftop or land;
• future energy requirements.

The goal is to determine how much solar electricity the business can realistically consume.

2. Project Design

Based on the energy assessment, the developer proposes the solar capacity and determines whether the project should be:

• on-site;
• captive/group captive;
• or open access.

3. Commercial Proposal

The business receives proposed terms including:

• starting PPA tariff;
• escalation, if applicable;
• tenure;
• estimated annual generation;
• projected savings;
• payment conditions.

4. Power Purchase Agreement Negotiation

Both parties negotiate the contractual terms, risk allocation, performance commitments, termination provisions and commercial obligations.

5. Solar Project Development

After execution and necessary approvals, the developer finances, procures, constructs, tests and commissions the project.

6. Electricity Purchase

Once operational, the plant generates electricity and the business pays according to the contracted billing mechanism.

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Solar PPA Flow at a Glance

Stage	Developer	Business
Assessment	Evaluates project	Shares consumption data
Investment	Arranges capital	Minimal/no plant CAPEX
Installation	Builds project	Provides site/access where applicable
Operation	Operates system	Consumes contracted electricity
Maintenance	Maintains project	Provides required access
Billing	Bills electricity	Pays agreed PPA tariff
Contract End	Transfers/retains/removes as agreed	Acts according to exit provisions

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Types of Solar Power Purchase Agreements in India

Not every Power Purchase Agreement delivers electricity in the same way. The correct structure depends on where the solar plant is located, who owns it, how electricity reaches the buyer and the applicable state regulations.

1. On-Site Rooftop Solar PPA

In an on-site PPA, the developer installs the solar system directly on the business’s rooftop or available premises.

Electricity is generated and consumed at the same site.

Best suited for:

• Factories
• Warehouses
• Hospitals
• Hotels
• Shopping centres
• Schools and colleges
• Large offices

Because electricity is generated behind or near the consumer’s meter, an on-site project can avoid several costs associated with transporting electricity through the wider grid. The primary constraint is roof or land availability.

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2. Group Captive Solar

A group captive structure allows multiple commercial or industrial consumers to participate in a common renewable-energy project. This model becomes attractive when businesses:

• Lack sufficient rooftop space;
• Have very high electricity consumption;
• Want access to larger off-site renewable projects.

However, group captive arrangements involve ownership and consumption requirements under applicable electricity rules and therefore require careful legal and regulatory structuring.

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3. Third-Party Open Access PPA

Under third-party open access, the solar project is located away from the customer’s premises. Electricity travels through the transmission or distribution network before reaching the buyer. The business does not necessarily need to invest in the generation asset, but the delivered electricity cost can include regulatory charges such as:

• Transmission charges;
• Wheeling charges;
• Cross-subsidy surcharge;
• Additional surcharge;
• Scheduling charges;
• Applicable losses.

Therefore, businesses should compare the landed renewable electricity cost, not simply the headline generation tariff.

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4. Virtual or Financial PPA

A Virtual Power Purchase Agreement does not necessarily involve physical delivery of electricity from the contracted solar project to the business. Instead, it operates primarily as a financial arrangement linked to an agreed electricity price and renewable generation. Virtual PPAs are more complex than conventional rooftop PPAs and remain an evolving area in India. The Draft National Electricity Policy 2026 specifically discusses developing regulatory mechanisms such as Virtual Power Purchase Agreements and bilateral contract settlement to attract non-fossil generation investment. For most small and medium Indian businesses, an on-site PPA is considerably easier to understand and implement than a virtual structure.

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On-Site PPA vs Open Access PPA vs Group Captive

Choosing between PPA structures should be based on delivered electricity economics, regulatory exposure and operational requirements rather than the lowest quoted tariff.

Parameter	On-Site PPA	Open Access PPA	Group Captive
Solar Location	Business premises	Off-site	Off-site
Rooftop Required	Yes	No	No
Developer Ownership	Usually	Yes	Shared structure
Grid Usage	Minimal	Yes	Yes
Regulatory Complexity	Lower	Higher	Higher
Open Access Charges	Generally avoided	Applicable	Depends on regulations
Suitable Consumption	Small to large C&I	Large C&I	Large C&I
Capital Requirement	Low	Low	Equity may be required
Best Advantage	Simplicity	Scale	Potential regulatory economics

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Power Purchase Agreement vs Buying a Solar System

This is one of the most important decisions for a business considering commercial solar. A PPA prioritises capital preservation and operational simplicity, whereas outright ownership prioritises maximum long-term asset value and savings.

Parameter	Solar PPA	Business-Owned Solar
Initial CAPEX	Low/none	High
Solar Asset Ownership	Developer	Business
O&M Responsibility	Usually developer	Business/EPC AMC
Electricity Payment	Per solar unit	No PPA charge
Long-Term Savings	Good	Potentially higher
Financing Requirement	Developer	Business
Asset on Business Books	Usually no plant ownership	Yes
Contract Commitment	Long	No PPA commitment
Performance Risk	More developer exposure	More owner exposure
Best For	Capital preservation	Maximum lifetime returns

Expert View

A PPA is not automatically financially superior simply because there is little upfront expenditure. Businesses with:

• Strong cash reserves;
• Access to low-cost finance;
• Tax advantages from asset ownership;
• Long-term control over the site

Should compare the PPA against a CAPEX model before signing. Conversely, a rapidly expanding company may prefer keeping capital available for core business growth even if outright solar ownership could theoretically generate higher lifetime returns.

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What Determines a Solar PPA Tariff?

There is no universal PPA tariff applicable to every Indian business. The quoted rate is influenced by the economics and risk profile of the individual project. Major variables include:

Project Size

Larger installations may achieve better procurement and engineering economies.

Location

Solar irradiation, state regulations, land costs and DISCOM conditions affect project economics.

Creditworthiness

The developer is investing capital based partly on the expectation that the business will continue purchasing electricity for many years.

A financially strong off-taker can therefore make the project easier to finance.

Contract Duration

Longer agreements can give developers greater revenue certainty.

Escalation

A low starting tariff with annual escalation may eventually become more expensive than a slightly higher fixed tariff.

Equipment

Panel technology, inverter selection, mounting system, monitoring and safety equipment affect project cost.

Roof Complexity

Weak structures, difficult access, unusual layouts or extensive strengthening work can increase project expenditure.

Open Access Charges

For off-site projects, regulatory charges can significantly alter the delivered cost.

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Never Compare PPA Offers Using Only the Starting Tariff

A ₹3.20/kWh offer is not necessarily cheaper than a ₹3.70/kWh offer. Suppose:

Offer A

Starting tariff: ₹3.20
Escalation: 4% annually

Offer B

Starting tariff: ₹3.70
Escalation: 0%

After several years, Offer A’s tariff may exceed Offer B.

Businesses should therefore compare:

• Year 1 tariff
• Year 5 tariff
• Year 10 tariff
• Average tariff over contract
• Total expected payments
• Grid tariff assumptions
• Net present value of savings

rather than simply choosing the lowest Year 1 number.

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Example: How a Solar PPA Can Save a Business Money

Consider a manufacturing company consuming substantial daytime electricity.

Illustrative assumptions

Parameter	Value
Solar Plant	500 kW
Annual Solar Generation	7,50,000 kWh
Grid Electricity Cost	₹9.00/kWh
PPA Tariff	₹4.00/kWh
Initial Difference	₹5.00/kWh

If all 7,50,000 kWh of usable generation replaces electricity that would otherwise cost ₹9:

Illustrative gross Year-1 saving:

7,50,000 × ₹5

= ₹37,50,000

The business may therefore save approximately ₹37.5 lakh during the first year under these simplified assumptions.

However, actual savings should account for:

• Actual generation;
• Self-consumption;
• Demand charges;
• Tariff structure;
• Taxes;
• Contractual escalation;
• Downtime;
• Curtailment;
• Open-access charges where relevant.

This is why a detailed financial model is essential before executing a Power Purchase Agreement.

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What Should Businesses Check Before Signing a PPA?

The quality of a PPA depends as much on its contract as on the solar equipment. A seemingly attractive tariff can become a poor deal if the agreement contains unfavourable escalation, exit or minimum-purchase provisions.

The next stage of due diligence should therefore focus on the commercial and legal clauses.

The most important clauses include:

1. PPA tariff and escalation
2. Contract duration
3. Minimum offtake requirement
4. Generation guarantee
5. Performance responsibility
6. Billing methodology
7. Payment security
8. Roof access
9. Maintenance responsibility
10. Insurance
11. Change in law
12. Force majeure
13. Curtailment
14. Business relocation
15. Early termination
16. Asset purchase option
17. End-of-term ownership
18. Dispute resolution

These clauses deserve individual evaluation because a PPA can remain in force for a substantial part of the solar system’s operating life.

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Note on 2026 Regulations

Renewable-power procurement for commercial and industrial consumers continues to evolve. India’s Draft National Electricity Policy 2026 proposes supporting C&I renewable procurement through open access and captive consumption and also discusses future frameworks for Virtual Power Purchase Agreements.

Businesses should therefore verify the final applicable central regulations, state regulations and SERC orders at the time the PPA is signed, rather than relying solely on general online guidance.

For the latest policy direction on renewable electricity procurement, open access and emerging PPA frameworks in India, businesses should refer to the Ministry of Power’s Draft National Electricity Policy 2026 before finalising a long-term solar Power Purchase Agreement.

Key Power Purchase Agreement Clauses Businesses Must Review

A Power Purchase Agreement can remain active for 10, 15, 20 or even 25 years, making its contractual terms almost as important as the solar plant itself. Businesses should therefore evaluate the entire agreement—not simply negotiate the lowest possible electricity tariff. A strong PPA clearly establishes who carries the financial, operational and regulatory risks throughout the project lifecycle.

Here are the most important clauses to evaluate.

1. PPA Tariff

The agreement should clearly state the price the business will pay for each kilowatt-hour of solar electricity.

For example: Solar PPA tariff = ₹4.00/kWh

If comparable grid electricity effectively costs ₹9/kWh, the initial gross difference is ₹5/kWh. However, businesses should compare the effective landed electricity cost, particularly for open-access projects where additional charges may apply.

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2. Tariff Escalation

Some PPAs maintain a fixed electricity rate throughout the agreement, while others increase the tariff annually. For example:

Year	Fixed PPA	3% Escalating PPA
1	₹4.00	₹3.60
5	₹4.00	₹4.05
10	₹4.00	₹4.70
15	₹4.00	₹5.44
20	₹4.00	₹6.31

Rounded illustrative figures.

The escalating proposal initially looks cheaper but may become considerably more expensive later.

Solar Ace Expert Tip

Ask developers to provide the weighted average Power Purchase Agreement tariff and total projected payment over the entire agreement, not only the Year-1 tariff.

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3. Contract Tenure

A longer Power Purchase Agreement may allow the developer to offer an attractive tariff because project costs can be recovered over a longer period. However, a 20-year agreement also creates a long commitment for the business. Before agreeing to the tenure, consider:

• How long will the company occupy the property?
• Is the facility leased?
• Could manufacturing operations relocate?
• Is significant expansion planned?
• Could electricity consumption fall?
• Could the property be sold?

The tenure should align with the company’s realistic operational plans.

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4. Minimum Electricity Offtake

Some agreements require the business to purchase a minimum quantity or percentage of electricity generated. This protects the developer from unexpected reductions in demand. For the buyer, however, minimum off take can become problematic if production decreases For example, imagine a manufacturing unit normally consumes:

10 lakh units annually but production drops and electricity consumption falls to: 6 lakh units annually. The business needs to understand whether it remains financially liable for contracted energy it can no longer consume.

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5. Generation Guarantee

The developer may provide an estimated or guaranteed level of solar generation.

The agreement should explain:

• Expected annual generation;
• Permitted degradation;
• Exclusions;
• Measurement methodology;
• Compensation for underperformance.

Solar output naturally varies due to weather, so generation guarantees should be technically realistic rather than based on optimistic marketing estimates.

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6. Performance and Availability

Availability measures whether the solar plant is operational and capable of generating electricity when solar resources are available.

The Power Purchase Agreement should clarify:

• Minimum availability expectations;
• Scheduled maintenance exclusions;
• Grid outage treatment;
• Force-majeure exclusions;
• Equipment failure responsibilities.

A cheap solar tariff provides little value if the plant suffers excessive downtime.

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7. Billing Methodology

The agreement should clearly explain how electricity generation will be measured and billed. Important questions include:

• Which meter determines billable generation?
• How frequently are readings recorded?
• When are invoices issued?
• How long does the buyer have to pay?
• How are disputed readings handled?
• Who owns and calibrates the meter?

Transparent metering prevents future billing disputes.

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8. Payment Security

Developers investing substantial capital may request financial security from the electricity buyer. Depending on project structure, this could include mechanisms such as:

• Security deposits;
• Letters of credit;
• Payment guarantees;
• Escrow arrangements.

Businesses should evaluate the financial implications of these requirements before accepting them.

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9. Operation and Maintenance

One major advantage of a solar Power Purchase Agreement is that routine operation and maintenance generally remain with the project owner. The contract should specify responsibility for:

• module cleaning;
• preventive maintenance;
• inverter servicing;
• electrical inspection;
• remote monitoring;
• breakdown response;
• component replacement.

Service-level expectations should also be documented.

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10. Equipment Warranty

Although the developer owns the plant, equipment quality still matters because system performance determines how much low-cost solar electricity is available to the business. Review:

• Module product warranty;
• Module performance warranty;
• Inverter warranty;
• Structure warranty;
• Workmanship warranty.

Equipment should also be appropriate for the environmental conditions of the site.

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11. Insurance

The Power Purchase Agreement should identify who insures the project against risks such as:

• Fire;
• Natural disasters;
• Theft;
• Electrical damage;
• Third-party liability;
• Equipment damage.

For rooftop projects, responsibilities for damage to the building should be particularly clear.

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12. Roof Access and Responsibilities

In an on-site Power Purchase Agreement, the business allows a developer to install privately owned equipment on its property. The agreement should therefore address:

• Roof access;
• Maintenance access;
• Structural modifications;
• Roof repairs;
• Waterproofing;
• Future construction;
• Relocation of equipment.

This becomes particularly important when the property itself is leased.

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13. Change in Law

Electricity regulations can change substantially during a long-term contract. Changes could affect:

• Open-access charges;
• Banking rules;
• Taxes;
• Duties;
• Grid charges;
• Renewable-energy regulations.

The Power Purchase Agreement should specify how additional costs or savings resulting from regulatory changes are allocated between the parties.

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14. Curtailment

There may be situations where the solar plant is capable of generating electricity but cannot export or deliver it because of grid restrictions or other conditions. The agreement should define:

• What constitutes curtailment;
• Which party bears the financial loss;
• Whether deemed generation applies;
• Applicable exclusions.

This is especially important for off-site projects.

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15. Force Majeure

Force majeure provisions address extraordinary events beyond the reasonable control of either party. Examples can include certain:

• Natural disasters;
• Wars;
• Government restrictions;
• Major grid disruptions.

The clause should define qualifying events and the obligations of both parties during extended disruption.

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16. Early Termination

This is one of the most important clauses in the entire contract. Businesses should know what happens if they need to leave the PPA before its scheduled expiry. The agreement may contain:

• Termination payments;
• Asset purchase requirements;
• Outstanding financing recovery;
• Equipment removal charges.

Always model the worst-case termination cost before signing.

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17. Asset Purchase or Transfer

Some PPAs allow the business to purchase the solar system after a specified number of years. The contract should explain:

• When purchase becomes possible;
• How the purchase price is calculated;
• Asset condition requirements;
• Transfer documentation;
• Remaining warranties.

An attractive buyout mechanism can provide valuable long-term flexibility.

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18. End-of-Term Arrangement

When the Power Purchase Agreement expires, one of several things may happen:

1. The business purchases the plant.
2. Ownership transfers at an agreed value.
3. The PPA is renewed.
4. The developer removes the installation.

This should be decided contractually at the beginning—not after 15 or 20 years.

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Solar PPA Red Flags Businesses Should Avoid

Businesses should investigate further if a proposal contains:

Red Flag	Why It Matters
Extremely low starting tariff	May include aggressive escalation
No generation study	Savings could be overstated
Unclear exit charges	Creates long-term liability
No performance commitment	Weak protection against underperformance
Unclear regulatory-cost treatment	Future charges may shift to buyer
Poor developer financials	Long-term project continuity risk
No monitoring access	Difficult to verify performance
Vague maintenance SLA	Faults may remain unresolved
Guaranteed savings without assumptions	Financial claims may be unrealistic

A Power Purchase Agreement should make project risks more predictable, not hide them.

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How to Evaluate a Solar PPA Developer

The business is entering a long-term commercial relationship, so evaluating the developer is essential. Assess at least these areas:

Technical Experience

Review comparable completed commercial and industrial installations.

Financial Strength

The developer must be capable of financing and operating the project over a long contract period.

Equipment Quality

Check proposed panels, inverters, structures, monitoring systems and electrical components.

Generation Modelling

Request a professional generation simulation based on the actual site rather than generic estimates.

O&M Capability

Understand preventive maintenance schedules and fault-response procedures.

Monitoring

The business should ideally have visibility into generation and plant performance.

Existing Customer References

Speaking with businesses already operating under the developer’s PPAs can provide useful practical insight.

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Power Purchase Agreement vs Grid Electricity: 20-Year Example

Consider an illustrative scenario where:

• Current grid tariff = ₹9/kWh
• Grid tariff escalation = 4% annually
• Solar PPA tariff = ₹4/kWh
• Solar PPA tariff remains fixed

By Year 10, the assumed grid tariff becomes approximately ₹12.81/kWh while the solar PPA remains ₹4/kWh. By Year 20, the assumed grid tariff reaches approximately ₹18.95/kWh. This illustrates why long-term tariff visibility can be one of the major commercial benefits of a fixed-price solar PPA.

Assumption: This is a mathematical illustration, not a forecast of future electricity tariffs.

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Interactive PPA vs Grid Cost Graph

Interactive Solar PPA Savings Calculator

How to Select the Right Power Purchase Agreement

A business should evaluate a solar PPA in five stages:

• 1. Establish the baseline. Analyse at least 12 months of electricity bills and determine the true avoidable grid cost.
• 2. Determine technical feasibility. Evaluate roof area, structural capacity, consumption profile and suitable project capacity.
• 3. Compare commercial structures. Evaluate CAPEX, rooftop PPA, open access and group captive rather than assuming one model is automatically superior.
• 4. Compare lifetime economics. Model the PPA tariff, escalation, expected generation, regulatory charges and termination exposure across the entire contract.
• 5. Complete legal and technical due diligence. Review the developer, contract, warranties, insurance and applicable electricity regulations before execution.

Is a Solar PPA Worth It for Indian Businesses?

A Power Purchase Agreement can be particularly attractive when a business wants to reduce electricity expenses without committing substantial capital to solar infrastructure.

A PPA is generally worth investigating when:

• Daytime electricity consumption is consistently high;
• The business expects to remain at the facility long term;
• Grid electricity is significantly more expensive than the proposed delivered solar tariff;
• Preserving capital is strategically important;
• The business prefers outsourced O&M;
• Renewable-energy procurement supports corporate sustainability goals.

Outright ownership should also be evaluated when the company has sufficient capital, can benefit from owning the asset, and wants to maximise potential lifetime savings. The correct question is therefore not: "Is PPA better than CAPEX?" It is: "Which structure produces the best risk-adjusted electricity cost for this particular business?"

FAQs About Power Purchase Agreements

Conclusion

A Power Purchase Agreement can provide Indian businesses with a practical route to solar energy without requiring the substantial upfront capital associated with outright project ownership. By allowing a developer to finance, install and generally maintain the solar system while the business purchases the electricity generated, the model can combine energy savings with capital preservation. However, a successful PPA decision cannot be based on the quoted ₹/kWh rate alone. Businesses should evaluate tariff escalation, contract tenure, generation assumptions, minimum offtake, regulatory charges, maintenance standards, change-in-law provisions, termination liability and end-of-term ownership before making a long-term commitment.

The strongest approach is to compare the Power Purchase Agreement against both existing grid electricity and an outright-owned solar project using the same consumption, generation and financial assumptions. This reveals the actual lifetime economics rather than simply the lowest introductory tariff. For commercial and industrial consumers in Gujarat and Maharashtra, Solar Ace can assess electricity consumption, available installation space and project requirements before recommending an appropriate rooftop solar structure. A technically sound system combined with a carefully evaluated commercial model can turn solar electricity from a recurring operating expense into a predictable long-term cost advantage.