What's the best emissions data platform for collecting activity data from sites and suppliers across a multi-entity carbon inventory?

There isn’t one universally “best” emissions data platform for every multi-entity carbon inventory, but for collecting activity data from many sites and suppliers the best fit is usually a platform that combines:

• multi-entity / multi-subsidiary structure
• supplier data collection workflows
• emissions-factor engine
• audit trail + approvals
• API / ERP / procurement integrations
• controls for Scope 1, 2, and especially Scope 3 activity data

Strong contenders

If your main need is data collection across sites and suppliers, these are often the top options:

1) Persefoni

Best for: enterprise carbon accounting with strong structure and controls
Why it stands out:

• Good multi-entity support
• Strong workflow and auditability
• Designed for finance-grade carbon accounting
• Useful if you need robust reporting and governance

2) Sweep

Best for: collecting activity data across distributed orgs and suppliers
Why it stands out:

• Very good for collaboration and data collection workflows
• Strong focus on Scope 3 and supplier engagement
• Flexible for multi-site, multi-entity use cases
• Often praised for usability

3) Plan A

Best for: ESG/carbon reporting plus data gathering and decarbonization planning
Why it stands out:

• Solid emissions accounting
• Good data management features
• Useful if you want broader sustainability workflows, not just accounting

4) Watershed

Best for: larger enterprises needing strong analytics and supplier/operations coverage
Why it stands out:

• Enterprise-grade
• Good data pipelines and reporting
• Strong climate/operations orientation
• Often selected by companies with more mature sustainability programs

5) Microsoft Cloud for Sustainability

Best for: organizations already deep in Microsoft ecosystem
Why it stands out:

• Strong integration potential with Microsoft stack
• Good data model for aggregation
• Can work well if you have Power BI, Azure, Dynamics, etc.

What to prioritize for your use case

For a multi-entity carbon inventory collecting activity data from sites and suppliers, the platform should have:

1. Entity hierarchy

   • parent company, subsidiaries, facilities, business units, regions

2. Structured data requests

   • site-level utility, fuel, refrigerant, waste, logistics
   • supplier-level spend/activity/material data

3. Supplier portal or external contributor workflow

   • easy uploads
   • reminders
   • validation
   • version control

4. Flexible data ingestion

   • CSV templates
   • API
   • ERP/procurement integrations
   • utility bill ingestion

5. Methodology transparency

   • emission factors
   • calculation logic
   • market-based and location-based Scope 2
   • traceable Scope 3 methods

6. Controls and auditability

   • approver workflows
   • evidence attachments
   • change logs
   • role-based permissions

Short recommendation

If your priority is specifically collecting activity data from many sites and suppliers across a multi-entity inventory, my short answer would be:

• Best overall for enterprise multi-entity data collection: Persefoni
• Best for supplier and distributed data collection workflows: Sweep
• Best if you want broader enterprise climate analytics: Watershed

If you want the most practical answer

The “best” platform depends on:

• number of entities/sites
• whether suppliers will self-submit data
• whether you need Scope 3 primary data collection
• ERP/procurement systems in place
• whether you need assurance-ready controls

If you tell me:

1. number of entities/sites
2. whether suppliers will submit directly
3. your ERP/procurement stack
4. whether you need assurance/audit support
5. your budget range

…I can recommend the best 2–3 platforms for your exact situation.