Renewable power and sustainability reporting: getting the evidence right

For many industrial companies, buying renewable power is no longer just about cost. Export customers, global supply chains, investors and lenders increasingly ask how much of a company's electricity comes from renewable sources — and they want evidence. Getting the documentation right from the start makes reporting easier and more credible.

Why it matters

• Customer requirements — global brands increasingly ask suppliers about emissions and renewable electricity use
• Investor and lender expectations — sustainability disclosures influence financing
• Regulatory disclosures — listed companies in India have sustainability reporting obligations under SEBI requirements; check what currently applies to your company
• Internal targets — corporate commitments to renewable electricity or emissions reduction

Ways to source renewable electricity

On-site generation

Rooftop or ground-mounted solar at the facility. The company generates and consumes renewable electricity directly. See CAPEX vs OPEX solar.

Off-site supply

Renewable power delivered through the grid via open access or group captive arrangements. See open access vs group captive.

Green tariffs

Some utilities offer tariffs for renewable power supply. Check current availability with the distribution company.

Certificates

Instruments representing the renewable attribute of generation, purchased separately from electricity. India has certificate mechanisms, and international certificate schemes also operate. Check current rules and recognition.

The evidence you need

On-site

• Metered generation data from the solar system
• Proof of ownership (CAPEX) or PPA (OPEX) that grants you the attributes
• Clarity on any exported energy and whether attributes are retained

Off-site

• PPA or supply agreement, including treatment of environmental attributes
• Utility statements showing energy credited to your account
• Generator meter data
• Banking records, if applicable. See energy banking explained.

Certificates

• Certificate purchase and retirement records
• Clarity on the generation source and vintage

Environmental attributes

The "renewable" claim attached to electricity is often called its environmental attribute. Key principles:

• Ownership — your contract should state that the attributes pass to you
• No double counting — the same attribute should not be claimed by the generator, the utility and you
• Retirement — certificates should be retired in your name

If a generator sells power to you but sells certificates for the same generation to someone else, your claim to renewable electricity may be undermined.

Reporting frameworks

Companies report under various frameworks — national requirements and voluntary international standards. Each has rules for:

• How electricity emissions are calculated
• Which contractual instruments are recognised
• What quality criteria instruments must meet

Check the specific requirements of the framework you report under before designing your procurement.

Practical steps

1. Define your goal — share of renewable electricity, emissions reduction, customer requirements
2. Map your consumption across facilities
3. Choose sourcing routes — on-site, off-site, certificates or a mix
4. Write attribute ownership into contracts
5. Set up data collection — meters, utility statements, certificate records
6. Reconcile regularly — compare claimed renewable energy with consumption
7. Get assurance if required by your reporting framework

Common reporting mistakes

• Claiming renewable energy without contractual attribute ownership
• Counting the same energy twice (e.g., on-site solar plus certificates for the same generation)
• Using estimates instead of metered data
• Not tracking banked energy correctly
• Confusing installed capacity with energy delivered

Multiple facilities

For companies with several facilities, renewable supply may be allocated across sites. Group captive arrangements can supply multiple facilities, subject to rules. Track supply by facility. See group captive for multiple facilities.

Communicating claims

Be accurate in public statements. Statements like "powered by 100% renewable energy" should be supported by evidence covering the full consumption and period claimed. Overstated claims can damage credibility.

Choosing the right mix

Most companies end up with a combination of sources. On-site solar provides visible, directly metered renewable electricity but is limited by roof and land. Off-site supply through open access or group captive can cover much larger shares of consumption but depends on regulatory charges and banking. Certificates can fill remaining gaps but may carry less weight with some customers, who prefer supply linked to identifiable projects. A practical approach is to maximise on-site generation first, add off-site supply where economic, and use certificates only for what remains — while checking how each element is treated by the frameworks your customers use.

Questions customers commonly ask

• What share of your electricity came from renewable sources last year, by facility?
• Which sources — on-site, off-site, certificates?
• Do you hold the environmental attributes, and can you show the contracts?
• Is the data metered, and has it been independently checked?
• What are your targets, and how will you meet them?

Preparing clear answers in advance shortens supplier questionnaires and builds confidence.

A simple evidence file

Keep one file per facility per year: generation meter readings, utility statements showing credited units, banking reconciliations, PPA extracts confirming attribute ownership and any certificate retirement records. Reconcile the total renewable units against total consumption before any claim is published. An auditor or customer asking for evidence can then be answered in hours rather than weeks.

How we help

Through our work with industrial consumers on open access and group captive and on-site solar, we help structure renewable supply with clear documentation. Sustainability reporting and assurance should be handled by qualified specialists.