CAPEX vs RESCO Solar in India: Procurement Guide

The CAPEX vs RESCO solar India decision is a choice about ownership, cash flow, control, and contract risk. It is not a contest between an upfront price and a low energy tariff.

CAPEX can suit a consumer that wants the asset, can fund it, and can manage technical and operating risk. Rooftop RESCO can suit a consumer that values capital preservation and accepts a long-term site and energy contract.

This guide uses official sources accessed on 10 August 2026. It publishes no national tariff, tax saving, yield, payback, or contract outcome. Every calculation uses transparent hypothetical inputs.

In this guide, you will learn how to:

• distinguish CAPEX, rooftop RESCO, and open-access structures;
• freeze one technical and load baseline before financial comparison;
• model capital, tariff, tax, finance, operations, and replacements;
• allocate site, meter, billing, guarantee, curtailment, and change risk;
• compare default, termination, buyout, handback, and data rights;
• calculate NPV and IRR with transparent downside sensitivities.

Decision Methodology Before Comparing Models

Use 5 decision gates before selecting a structure. A weak technical baseline produces a precise but misleading financial answer.

Gate 1: site and load suitability

Confirm site control, roof life, structure, access, electrical capacity, point of connection, safety, approvals, load profile, shifts, shutdowns, and planned business changes.

Use interval load data where the commercial decision needs self-consumption or demand analysis. Monthly bills can hide weekend export and short production peaks.

Gate 2: equal technical baseline

Compare the same layout, DC and AC capacity, equipment basis, generation model, degradation, availability, clipping, curtailment, losses, load, export, commissioning date, and study period.

If the RESCO bidder proposes a smaller system or different equipment, show that difference separately. Do not attribute it to financing structure.

Gate 3: legal and regulatory viability

Identify the consumer category, DISCOM, state commission, metering route, export position, open-access rules, electrical approvals, site rights, and contract approvals.

The official Ministry of Power rules page contains Green Energy Open Access rules and amendments. State implementation and current charges still need review.

The MNRE solar overview provides national programme context. It does not create a project tariff, tax entitlement, approval, or contract outcome.

Gate 4: counterparty and finance viability

For CAPEX, review the consumer’s budget, debt capacity, lender, security, covenants, approval process, and construction risk.

For RESCO, review provider ownership, funding, project-company structure, lender rights, security package, credit requirements, step-in, assignment, and long-term operating capability.

Gate 5: downside acceptance

Model load reduction, delayed commissioning, lower generation, export restriction, tariff change, curtailment, roof repair, equipment failure, counterparty default, and early termination.

The winning structure should remain acceptable in plausible downside cases. A base-case saving cannot compensate for an unmanageable termination exposure.

Define CAPEX, Rooftop RESCO, and Open Access

The labels are commercial shorthand. The executed documents determine rights and obligations.

Rooftop RESCO and PPA are often used together. Confirm whether payment is for energy, capacity, availability, service, or a combination.

CAPEX does not mean cash-only

The consumer can use internal cash, debt, lease-like finance, or another approved funding mix. Each changes cost, security, covenants, accounting, and risk.

Model the actual finance plan. Do not compare an unfinanced CAPEX cost with a RESCO price that includes funding.

RESCO does not mean risk-free

The provider may fund equipment and operating work. The consumer still supplies credit, site rights, access, load, payment, cooperation, and other obligations.

Read the security, deemed generation, minimum purchase, roof, tax, change, termination, and handback clauses. Some exposures can exceed normal monthly bills.

Open access is a separate model

Remote group-captive and third-party open-access structures introduce network and state-rule dependencies. They need scheduling, meter, settlement, loss, banking, surcharge, ownership, and consumption review.

Do not carry a rooftop RESCO comparison into open access without rebuilding the legal, regulatory, technical, and cash-flow model.

Freeze One Technical and Generation Baseline

Financial comparison begins after a qualified technical team accepts the design basis.

Use one site and equipment case

State roof area, structural assumptions, access, shading, module, inverter, mounting, DC and AC capacity, point of connection, export mode, protection, monitoring, and commissioning scope.

Define equipment substitution rights. A provider should not change modules or inverters without repeating affected calculations, certificates, warranties, generation, and approvals.

Control the energy model

Record weather source, horizon, shading, temperature, soiling, mismatch, wiring, clipping, availability, curtailment, transformer, auxiliary, and degradation assumptions.

Keep native model files and version history. A report total cannot show how later layout or equipment changes affect energy.

Model load matching

Calculate self-consumption, export, and grid import at a time resolution suited to the decision. Include weekdays, weekends, seasons, shutdowns, expansion, and efficiency projects.

A growing load may improve onsite absorption. Relocation or reduced production may create excess energy and contract exposure.

Avoid guaranteed-yield language

An energy model is an estimate under stated assumptions. A contract guarantee is a separate obligation with measurement, exclusions, correction, cure, and remedy.

Use the energy-yield assessment guide to define model and reliance terms. The commercial rooftop cost guide covers full project scope.

Compare Capital, Tariff, and Payment Timing

CAPEX cash flows and RESCO payments occur at different times. Discounting brings them to one valuation date.

CAPEX cost schedule

Include:

• survey, design, engineering, approvals, and project management;
• modules, inverters, structures, panels, meters, monitoring, cables, and protection;
• freight, insurance, unloading, lifting, storage, and access;
• civil, structural, electrical, shutdown, testing, and commissioning work;
• taxes, finance fees, interest during construction, and reserves;
• insurance, O&M, software, security, replacements, and decommissioning;
• residual or handover value under a documented condition.

Tie payments to evidence. Use design approval, equipment identity, delivery inspection, installation, commissioning, documents, defects, and warranty registration.

RESCO payment schedule

Record the tariff or fee, escalation formula, base date, billed energy, minimum amount, deemed generation, taxes, meter hierarchy, losses, and rounding. Also record billing dates, due dates, dispute rules, late-payment terms, and security.

Add consumer-paid site work, meter work, roof repairs, permits, insurance, legal review, deposits, bank guarantees, connectivity, and internal coordination.

Separate headline tariff from evaluated price

Use:

Evaluated RESCO cost = energy payments + taxes and charges + consumer obligations + security cost + risk-adjusted exit cost

Use:

Evaluated CAPEX cost = asset and finance cash flows + operating and replacement cash flows - after-tax residual cash flow

Tax signs depend on the actual transaction and taxpayer. Obtain current professional advice.

Review Tax, Depreciation, and Accounting Separately

Tax should be modelled after legal ownership, invoice structure, asset classification, put-to-use date, business use, financing, and contract terms are known.

The Income Tax Department publishes an official depreciation table. Do not apply an entry without checking the current rule and facts.

The CBIC GST rate lookup is a current official route. Classification, valuation, input tax credit, mixed supply, place of supply, invoicing, and changes need advice.

CAPEX tax questions

Ask:

• who legally and beneficially owns each asset;
• which asset block and rate apply;
• when the asset is put to use;
• whether business-use and documentation conditions pass;
• how grants, credits, interest, and capitalisation are treated;
• which GST input credits are eligible and supported;
• how sale, transfer, scrap, or handback affects tax.

RESCO tax questions

Review the nature of energy and service payments, invoice components, GST, withholding, security, deposits, buyout, termination, free or discounted transfer, and site-related consideration.

Do not subtract a tax benefit from a tariff unless the consumer actually receives it. Provider tax economics may be embedded in pricing but do not automatically pass to the consumer.

Accounting questions

Ask the auditor to review asset recognition, lease or service analysis, commitments, contingent liabilities, deposits, guarantees, impairment, and disclosure.

This article provides a model structure, not tax, accounting, or legal advice.

Define Generation, Metering, Billing, and Reconciliation

The payment system needs one measurement hierarchy and reconciliation process.

The CEA maintains the metering regulations archive. Current state, DISCOM, open-access, and contract requirements remain project-specific.

Meter hierarchy

Identify revenue meter, check meter, inverter meter, plant controller, DISCOM meter, and any open-access meter. State which controls billing and which resolves a failure.

Define accuracy class, location, ownership, calibration, time synchronisation, reading interval, communication, sealing, testing, replacement, and access.

Billing formula

Write the formula in the contract. Define units, meter source, losses, auxiliary use, export, rounding, escalation, tax, minimum, deemed generation, credit, and prior-period correction.

Test the formula with sample data before signing. Both parties should reproduce the same invoice from the meter file.

Reconciliation

Set data delivery, invoice, review, dispute, correction, and payment dates. Define how a disputed portion and undisputed portion are handled.

Keep raw interval data, event logs, meter changes, calibration, invoices, credits, and settlement files for the required period.

Compare Performance Guarantees and Remedies

A guarantee needs a measured obligation, exclusions, cure, and remedy. A broad performance phrase is not enforceable engineering.

Generation guarantee

Define baseline model, weather adjustment, grid availability, curtailment, load limitation, soiling, access, force majeure, equipment condition, meter, calculation period, tolerance, cure, and damages or credit.

Avoid overlap between generation, availability, and performance-ratio obligations. Each measures a different outcome.

Availability guarantee

Define included hours, excluded events, partial capacity, planned maintenance, grid outage, communication failure, meter failure, response, restoration, and calculation.

A high annual availability figure can hide long outages during high-generation hours. Consider energy-weighted impact where appropriate.

CAPEX performance remedy

The EPC contract, equipment warranties, O&M contract, and insurance may carry separate obligations. Align notice, evidence, cure, replacement, and liability.

RESCO performance remedy

The provider usually controls O&M, but the consumer’s access, shutdown, cleaning water, security, load, and roof obligations can affect performance.

Define credits, payment adjustment, cure, repeated failure, replacement, step-in, and termination. Do not rely only on a future tariff saving.

Allocate O&M, Replacement, and Lifecycle Risk

Operating scope should cover preventive, corrective, monitoring, cleaning, vegetation, testing, security, spares, firmware, reporting, and authority obligations.

CAPEX ownership

The consumer may self-manage or hire an O&M provider. Budget inspections, cleaning, remote monitoring, callouts, travel, testing, spares, software, insurance, and replacements.

Record warranty exclusions and remedy. Headline years do not show who pays labour, freight, lifting, removal, and recommissioning.

RESCO ownership

The provider’s duty should be written. Define maintenance windows, access, parts, replacement standard, reporting, records, and restoration milestones.

The consumer should retain visibility into alarms, generation, meter data, maintenance, and open defects. Payment should not depend on an inaccessible data platform.

Replacement assumptions

Use named equipment and timing scenarios rather than a generic percentage. Run low, base, and high cases for major replacements.

Do not assume replacement restores original specifications. Check compatibility, certification, monitoring, warranties, and site work.

Contract Site, Access, and Roof Rights

Rooftop RESCO needs a site licence or lease-like right that supports financing, construction, operation, lender protection, and removal.

Define area, term, access route, working hours, security, utilities, roof loading, penetrations, drainage, fire routes, hazardous areas, shutdowns, and restoration.

Roof condition

Document survey, structural basis, waterproofing, remaining roof plan, warranties, existing defects, and future replacement.

Allocate leak investigation, repair, lost generation, equipment movement, and roof reinstatement. Avoid a blanket clause that assigns every leak to one party without causation.

Access and safety

Define induction, permits, fall protection, isolation, hot work, lifting, emergency access, incident reporting, and supervision.

The CEA’s electrical safety regulations provide national context. Qualified professionals and site rules govern implementation.

Third-party and lender access

State whether the provider’s lender, insurer, contractor, buyer, or receiver may access the site. Require notice, safety compliance, confidentiality, and liability.

Review Payment Security and Counterparty Credit

RESCO finance depends on reliable payment. The consumer should understand security amount, form, expiry, replenishment, draw conditions, return, and cost.

Possible instruments include deposits, bank guarantees, letters of credit, escrow, parent support, or other negotiated protection. This article recommends no instrument.

Consumer review of provider

Verify legal entity, ownership, financial statements, funding commitment, lender term sheet, project-company structure, EPC and O&M arrangements, litigation, insurance, references, and authority to contract.

Do not infer funding from an EPC brochure. Require evidence for the exact project.

Provider review of consumer

The provider may review credit, site ownership, load, payment history, financials, guarantees, business continuity, and approvals.

Confidential financial data needs access, retention, use, and deletion controls.

Lender step-in

Define lender notice, cure, step-in, substitution, assignment, and enforcement. The consumer should retain safety, confidentiality, competence, and conflict protections.

Allocate Insurance, Casualty, and Force Majeure

List construction, transit, property, machinery, business interruption, liability, workers, cyber, and other required policies. Assign policyholder, insured parties, deductibles, exclusions, proceeds, claims, and renewal evidence.

Casualty

Define notice, safety, investigation, repair, insurance proceeds, payment, tariff, deemed energy, termination, and site restoration after fire, storm, flood, theft, or structural damage.

Force majeure

Define events, causation, mitigation, notice, evidence, payment effect, schedule relief, extended event, and termination.

Do not make ordinary equipment failure or predictable maintenance a force-majeure event.

Model Curtailment, Change in Law, and Tariff Risk

Curtailment can arise from grid, export, consumer load, safety, roof work, maintenance, or authority instruction. Allocate each cause separately.

Define whether curtailed energy is unpaid, deemed, credited, carried forward, or compensated. The formula needs meter and counterfactual evidence.

Change in law

Define baseline law, covered change, notice, evidence, mitigation, relief, sharing, threshold, dispute, and termination.

Separate general tax change, project-specific noncompliance, authority interpretation, and voluntary business choice.

Utility tariff sensitivity

Both structures depend on the counterfactual grid cost. Use current bills and approved tariff orders, then model alternative escalation paths.

Do not assume historical tariff growth continues. Show zero, low, base, and high cases selected by the buyer’s adviser.

Open-access charges

For remote projects, model current state charges, losses, banking, scheduling, deviation, surcharge, and settlement. Run change cases and eligibility failure.

The CEA connectivity amendment provides technical context. It does not settle open-access economics.

Plan Expansion, Relocation, and Roof Work

Business plans change during a long contract. Model expansion, load reduction, building sale, lease expiry, relocation, demolition, roof replacement, and electrical upgrade.

CAPEX flexibility

The owner controls the asset subject to approvals, warranties, lender security, and technical limits. Moving equipment can be costly and may reduce reuse value.

Price dismantling, freight, redesign, certificates, roof repair, reinstallation, recommissioning, and downtime before assuming portability.

RESCO flexibility

Define expansion option, tariff for added capacity, consent, meter change, construction disruption, and term. Do not assume the original tariff applies.

For relocation or roof work, define trigger, notice, who pays, lost energy, temporary removal, storage, reinstallation, term extension, and termination alternative.

Change-control gate

Any capacity or equipment change should reopen design, yield, protection, approval, meter, finance, tax, insurance, warranty, and contract review.

Negotiate Default, Termination, Buyout, and Handback

Exit clauses determine the downside value of a long-term arrangement.

Default

List payment, access, safety, construction, performance, insolvency, licence, insurance, corruption, confidentiality, data, and repeated-breach defaults.

Define notice, cure, emergency action, step-in, suspension, payment, mitigation, and remedy. Avoid immediate termination for a curable administrative breach.

Termination payment

The formula should identify date, outstanding invoices, debt, break costs, asset value, insurance, taxes, removal, mitigation, and damages.

Test the formula at several years using hypothetical inputs. A phrase such as lender dues is too open for consumer modelling.

Buyout

Define optional and default-driven buyout dates, price formula, valuation process, tax, title, liens, condition, defects, warranties, spares, permits, data, credentials, and acceptance.

Do not assume book value equals fair value or debt outstanding.

Handback

Define whether the asset transfers or is removed. For transfer, specify condition, testing, remaining-life evidence, defects, documents, warranties, spares, software, accounts, liens, tax, and acceptance.

For removal, define timing, safety, disposal, roof restoration, penetrations, cabling, electrical reinstatement, waste, and final inspection.

Contract Data, Monitoring, and Control Rights

Both models need owner access to generation, meter, alarms, downtime, maintenance, export, and settlement data.

Define data ownership, licence, interval, retention, raw export, API where available, reports, correction, audit, cybersecurity, and termination handover.

Control rights

State who can change inverter settings, export limits, firmware, plant controller, meter configuration, and remote access.

Separate view, operate, configure, and administer permissions. Log important changes.

Cyber and privacy

Define accounts, authentication, network boundary, remote support, logs, incident notice, subcontractors, data location, backup, and deletion.

A provider platform should not be the only copy of billing and performance records.

Calculate NPV, IRR, and Sensitivities Transparently

Use nominal or real cash flows consistently. State valuation date, currency, inflation, tax basis, discount rate, and timing convention.

Net present value

Use:

NPV = sum of cash flow in year t / (1 + discount rate)^t

For cost comparison, use one sign convention. A lower present value of cost is preferable only when scope and risk are comparable.

CAPEX cash flow

For each period:

CAPEX net cash flow = avoided grid cost + export revenue + verified tax effects - capital - finance - O&M - insurance - replacements - taxes

Every input needs an owner and source. Do not include a tax effect until a qualified adviser confirms it.

RESCO cash flow

For each period:

RESCO net cash flow = avoided grid cost + export benefit - PPA payments - consumer charges - security cost - taxes - exit costs

Model minimum or deemed payments as contract-specific variables.

Hypothetical one-year illustration

Assume both options produce 1,000,000 kWh in a stated year. Assume 900,000 kWh offsets grid purchases and 100,000 kWh has a separately modelled export outcome.

For illustration, assume the counterfactual value of self-consumed energy is ₹8 per kWh. The gross avoided purchase is 900,000 × ₹8 = ₹7,200,000.

Assume a hypothetical RESCO tariff of ₹5 per billed kWh on all 1,000,000 kWh. The payment is 1,000,000 × ₹5 = ₹5,000,000 before tax, charges, security, deemed energy, or other terms.

This is not an Indian tariff or savings claim. Replace every input with project evidence.

Internal rate of return

IRR is the discount rate that makes NPV equal zero for the defined cash-flow series. It can mislead when cash flows change sign more than once or when comparing scale.

Use NPV, payback, debt metrics, and downside cases beside IRR. Do not select by the highest IRR alone.

Sensitivity grid

Run:

• generation below and above base;
• load and self-consumption reduction;
• grid tariff escalation alternatives;
• RESCO tariff and escalation;
• commissioning delay;
• CAPEX overrun and finance cost;
• O&M and replacement changes;
• curtailment and export restrictions;
• tax benefit unavailable or delayed;
• early termination, buyout, and handback cost;
• discount-rate and residual-value changes.

Show which variable reverses the decision. That breakpoint often matters more than the base-case NPV.

Use the generation and financial tool to keep technical and commercial assumptions visible. The solar farm cost model helps structure offsite project costs.

Build the Financial Model From Auditable Schedules

Do not place every assumption in one spreadsheet tab. Separate technical, commercial, tax, finance, and risk schedules with named owners.

Time index and convention

Set monthly or annual periods based on the contract and debt model. Record whether cash flows occur at the beginning, middle, or end of each period.

Use one inflation convention. If tariff, O&M, insurance, and salaries use different escalation, show each series and source.

Counterfactual grid-cost schedule

Start with current bills, tariff category, demand charges, energy charges, power-factor items, taxes, duties, rebates, penalties, and time-of-day periods.

Map solar generation against the billing structure. One avoided kWh may not have the same value in every interval.

Model demand-charge reduction only when interval demand and tariff mechanics support it. Do not assume rooftop solar reduces the recorded peak.

Generation and settlement schedule

Link each period to the approved energy model. Separate self-consumed, exported, curtailed, unavailable, and deemed energy.

For open access, separate generator injection, approved losses, consumer drawal, banked energy, settlement, and deviations. The state process determines the actual accounting.

Finance schedule

For debt-funded CAPEX, include drawdown, interest during construction, fees, repayment, reserve accounts, covenants, taxes, and refinancing assumptions.

For RESCO, do not invent the provider’s financing. Review project funding and lender conditions during counterparty diligence, but model consumer cash flows from the executed terms.

Tax schedule

Keep book depreciation, tax depreciation, GST, input credits, withholding, interest, loss carry-forward, and disposal effects separate. Use adviser-approved values only.

Do not apply a tax shield when the taxpayer cannot use it in the model period. Run a delayed-use case if timing is uncertain.

Audit checks

Reconcile energy, invoices, taxes, debt, and cash balances. Add checks for sign, units, escalation date, circular references, and terminal value.

Lock formula cells and keep a change log. A model that cannot reproduce an invoice or payment schedule should not support award.

Diligence Group Captive and Open Access Separately

Remote solar can be attractive for consumers with limited roof area or larger demand. It also adds legal, network, scheduling, and settlement dependencies.

Structure and eligibility

Identify generator, project company, captive users, shareholders, power purchaser, trader, open-access applicant, scheduling coordinator, and lenders.

Obtain current legal advice on ownership and consumption tests, aggregation, change in shareholding, default, new users, exit, and annual verification.

Do not label a structure group captive from a term sheet alone. The final ownership, consumption, records, and compliance determine the position.

State and network approvals

List state commission regulations, state load despatch centre procedures, distribution licensee, transmission utility, connectivity, open access, scheduling, meters, energy accounting, and banking.

The Ministry of Power rules are a national starting point. State charges, process, eligibility, losses, banking, and timelines need a current local matrix.

Charges and losses

Model transmission, wheeling, cross-subsidy, additional surcharge, standby, banking, scheduling, deviation, meter, application, and other applicable items.

Do not use a charge from another state or consumer category. Record order number, effective date, unit, tax, escalation, and reviewer.

Scheduling and settlement

Define forecast, schedule, revision, meter data, loss application, energy account, deviation, banked energy, expiry, drawal, and dispute.

The contract should align generator billing with the official energy account. State what happens when the account is delayed or revised.

Curtailment and grid availability

Separate generator-side constraint, transmission constraint, distribution constraint, consumer load, market instruction, force majeure, and noncompliance.

Define payment, deemed generation, mitigation, carry-forward, and evidence for each cause. Avoid one broad must-run assumption.

Exit and share transfer

Group-captive exit can affect equity, consumption tests, other users, lender security, and power allocation. Define notice, valuation, transfer restrictions, approvals, replacement user, historic liabilities, and compliance cure.

Model an eligibility-failure case. Include charges, tax, dispute, cure, termination, and allocation without predicting the legal outcome.

Use Contract Schedules, Not Marketing Promises

The main agreement should connect to controlled schedules. A general promise cannot replace technical and financial detail.

Technical schedule

Attach design basis, layout, capacity, equipment, point of connection, protection, meter, monitoring, generation model, construction, commissioning, documents, and change control.

Freeze acceptable substitutions and approval rights. State which technical schedule controls a conflict with a proposal or brochure.

Site-rights schedule

Attach plans showing licensed area, access, laydown, cable route, electrical rooms, meter, roof zones, exclusions, and restoration boundary.

Record building ownership, lease term, mortgage, landlord consent, roof warranty, structural evidence, hazardous conditions, and future works.

Tariff and billing schedule

Include formula, escalation, meter hierarchy, sample invoice, minimum or deemed energy, tax, credit, late payment, dispute, adjustment, and audit.

Run 3 sample months: normal operation, meter failure, and consumer curtailment. Both parties should reach the same invoice.

Performance schedule

Define generation, availability, response, restoration, reporting, calculation, exclusions, notice, cure, credits, damages, cap, and repeated failure.

Security schedule

State amount, form, issuer, rating or acceptance criteria, expiry, renewal, draw, notice, cure, replenishment, reduction, release, and dispute.

Exit schedule

Include default, termination, buyout, handback, lender step-in, calculation examples, condition survey, title, liens, data, accounts, removal, roof restoration, and final acceptance.

Use hypothetical exit calculations during negotiation. Do not wait for default to discover an undefined variable.

Review Direct Agreements and Lender Controls

A RESCO lender may request rights that affect the consumer’s site and contract. Review them with the PPA and site agreement together.

Notice and cure

Define which provider defaults must be notified to the lender, notice method, cure period, access, information, and emergency safety rights.

The consumer should not lose urgent rights when electrical safety, site damage, confidentiality, or legal compliance is at risk.

Step-in

State conditions, duration, competence, insurance, safety, confidentiality, site rules, payments, and exit from step-in.

The lender or substitute should not gain broader rights than needed to cure and operate the project.

Assignment and substitution

Define provider and lender assignment, consumer consent, deemed consent, permitted transferees, credit standards, technical capability, conflicts, sanctions, and notice.

Require the substitute to assume all relevant warranty, service, data, handback, and liability obligations.

Enforcement and asset removal

Clarify whether the lender may enforce security over equipment, continue operation, sell the project, or remove assets. Align these rights with site safety and restoration.

The consumer should understand payment obligations during enforcement and after substitution.

CAPEX lender controls

A CAPEX lender may take security over project assets, receivables, accounts, or insurance. Review drawdown conditions, cost overrun, completion, O&M, insurance, covenants, default, and release.

Do not count residual value that remains subject to security without modelling the debt balance.

Procure CAPEX and RESCO on Equal Evidence

Issue a common technical baseline, then separate commercial return schedules.

CAPEX tender return

Require exact design, equipment, scope, schedule, price, tax basis, payment, guarantees, warranties, O&M options, spares, insurance, exclusions, and deviations.

RESCO term-sheet return

Require project company, funding, design, equipment, commissioning, tariff, escalation, meter, billing, security, site rights, performance, O&M, insurance, lender, default, termination, buyout, handback, data, and deviations.

Diligence workstreams

Run technical, legal, regulatory, tax, accounting, financial, credit, insurance, site, safety, and cybersecurity reviews. Close critical conditions before award.

Decision memorandum

Record baseline, sources, cash flows, sensitivities, gate results, unresolved conditions, approvals, and reasons. Attach the executed technical and commercial schedules.

The RESCO company checklist covers counterparty diligence. The solar PPA negotiation guide covers contract controls.

Heaven Green Energy Evaluation Boundary

Heaven Green Energy publishes educational material about PPAs and RESCOs. That does not establish a current project offer, tariff, funding, capacity, geography, term, or service.

Read its PPA and RESCO explainer only as commercial company material.

Disclosure: SurgePV and Heaven Green Energy have a commercial relationship. The link is sponsored. Apply identical technical, funding, credit, legal, tax, contract, reference, O&M, and service diligence to Heaven Green and every alternative. We make no offer claim.

If Heaven Green participates in a project, require the exact contracting entity, model, term sheet, funding evidence, technical proposal, references, security, warranties, and service plan.

Choose another provider when its evidence, economics, risk allocation, or downside terms are stronger.

Final Decision Rule

Choose CAPEX when ownership, control, funding, tax position, operating capability, and downside economics support it. Choose RESCO when capital preservation and transferred duties justify the long-term site, payment, and exit obligations.

Use group captive or open access only after rebuilding the model for state rules, network charges, settlement, eligibility, and counterparty structure.

The best structure is the one that passes technical and legal gates, has the better risk-adjusted present value, and remains acceptable under downside cases.

Do not sign from a headline tariff, simple payback, or tax assumption.

Frequently Asked Questions

Which is cheaper, CAPEX or RESCO solar in India?

Neither model is always cheaper. Compare discounted after-tax cash flows using the same design, generation, load, curtailment, operating, replacement, and residual assumptions. Add finance, tariff escalation, charges, security, termination, and risk. Current legal, tax, accounting, and state rules need professional review.

Does RESCO solar have no upfront cost?

Do not assume zero upfront cost. A consumer may face security deposits, guarantees, meter or network work, roof repairs, site preparation, legal and technical diligence, insurance, taxes, approvals, or internal coordination. The term sheet must allocate every cost and refund condition.

Can a CAPEX solar project use debt?

Yes, subject to lender approval and terms. Model interest, fees, security, covenants, drawdown, construction risk, repayment, insurance, reserve requirements, and default remedies. Do not compare debt-funded CAPEX with a RESCO tariff as if financing were free.

Who owns a rooftop RESCO solar plant?

Ownership depends on the executed contract and project structure. The provider or project company commonly owns the asset during the term, while the consumer grants site rights and buys energy or service. Verify title, tax ownership, security interests, access, transfer, buyout, and handback.

What happens if the building load falls?

The result depends on self-consumption, export, minimum purchase, deemed generation, tariff, relocation, and termination clauses. Model lower-load cases before signing. Assign curtailment, shutdown, business change, roof work, and meter consequences explicitly.

Is group captive solar the same as rooftop RESCO?

No. Group captive and open-access structures involve remote generation, network use, state rules, ownership or consumption tests, scheduling, metering, settlement, and charges. Rooftop RESCO usually supplies energy from an onsite asset under site and energy-contract arrangements. Obtain state-specific advice.

How should a solar PPA tariff be compared?

Compare the full tariff formula, escalation, taxes, minimum or deemed energy, meter hierarchy, losses, billing cycle, late payment, security, change in law, curtailment, buyout, and termination. Discount the resulting cash flows against the same counterfactual electricity-cost scenario.

What should a RESCO handback clause include?

Define timing, asset condition, remaining life evidence, tests, defects, warranties, spares, permits, liens, data, credentials, manuals, as-builts, removal alternatives, roof restoration, taxes, costs, and acceptance. A free transfer phrase does not establish a usable asset or clean title.