Carbon Accounting as Enterprise Software
Ryan Miller, VP & GM of Private Markets at Persefoni, on building an ERP for carbon
This frames carbon accounting as a real software category, not a one company product niche. Persefoni is competing most directly with platforms that help enterprises pull activity data from finance, procurement, travel, facilities, and supply chain systems, convert it into emissions numbers, and package that data for disclosure and reduction planning. Watershed and Sweep matter because they are funded to build the same core system of record for corporate climate data.
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The practical workflow is similar across peers. Customers gather inputs like electricity use, fuel burn, shipping miles, purchased goods, and portfolio holdings, then software maps those inputs to emissions factors and rolls them into audit ready reports. That is the core engine Persefoni says it is selling.
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The peer set splits cleanly by job to be done. Watershed overlaps most on measurement, reporting, and reduction workflows. Sweep is grouped alongside it as another carbon management platform. Sylvera sits later in the stack, rating offset projects, while Patch handles offset procurement infrastructure.
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Funding helped define the category early. Persefoni described its $101 million Series B in 2021 as fuel to replace spreadsheet and consultant driven carbon accounting with software. Watershed raised $70 million in 2022 and later expanded into disclosure and marketplace products, showing how peers were racing to own the broader climate operating system.
The market is heading toward convergence around a few scaled platforms that combine measurement, disclosure, and action. As climate reporting moves closer to finance and procurement workflows, the winners will be the vendors that become the trusted source of emissions data inside large companies, then expand from reporting into reduction decisions and carbon buying.