ESS Tech

Does the core business genuinely avoid or reduce emissions, or build climate resilience? Share of revenue that is actually 'green'. Fossil-dependent models score low.

Iron flow batteries using earth-abundant, non-toxic iron, salt, and water directly enable renewable energy integration and long-duration grid storage, with third-party utility validation (Burbank Water and Power / APPA) confirming the technology works in real-world deployment — but commercial scale remains extremely limited (revenue $1.6M in 2025) so realized impact is nascent.

Credible, science-based targets (SBTi), a real net-zero plan with progress to date, and CDP disclosure — not just a dated press release.

No SBTi-validated targets, no CDP disclosure, and no publicly available Scope 1/2/3 emissions data have been identified; DitchCarbon scores ESS at 23/100 on carbon action, explicitly noting the absence of concrete emissions figures or reduction commitments.

Operational footprint, labour and social practices, and governance quality across the company's own operations and supply chain.

Sustainalytics rates ESS Tech's management of ESG material risk as only 'Average'; the company nearly shut down operations in mid-2025, signaling serious governance and financial-management weaknesses, and no independently verified labor, social, or operational sustainability report is publicly available.

Quality of disclosure, independent third-party verification, and how much hard data backs the company's claims.

ESS files regular SEC reports (10-K, 8-K) which provide financial transparency, and one third-party APPA/utility performance evaluation was published; however, there is no standalone sustainability report, no GHG inventory, no CDP response, and no independently verified environmental metrics — disclosure quality is minimal for a company marketing itself as a climate solution.

Controversies, litigation, pollution, fossil-fuel lobbying, conflict-zone involvement and governance scandals. Higher means cleaner.

No environmental violations, fossil lobbying, or labor scandals found; the primary integrity concern is a SPAC-era history of losses and a repeated NYSE minimum price deficiency (March 2024, June 2026), plus going-concern disclosures — these reflect governance and financial execution risk rather than direct ethical or environmental harm.