altafiber is a US telecommunications operator providing fiber and broadband infrastructure, primarily in the Midwest and Hawaii.
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altafiber reports Scope 1+2 emissions with third-party verification and a 40%-by-2030 target, but Scope 3 (73% of footprint) is screened only once per 3–5 years with no supplier engagement. Operations emissions declined 11.4% since 2021—slower than target pace—while Scope 1 rose. Renewables cover under half of electricity. A $100M wildfire settlement marks material liability risk.
altafiber scores 48/100 (Making progress) on SINK's independent climate assessment, scored from public data only. Fees pay for the review, never the result. Last verified October 2026.
That places altafiber joint 198th of 847 companies scored, and 9th of 18 in Telecommunications.
Where altafiber sits among telecommunications peers.
Among the 18 major telecommunications brands we've scored, altafiber sits 9th of 18.
Its three lowest-scoring questions, and what the evidence didn't show.
No nature-risk assessment, biodiversity data, TNFD disclosure, or habitat commitment found.
No company-wide water consumption reported.
Market-based Scope 2 only 21% below location-based, implying renewables under 50%.
A score changes when the evidence does. We use new published evidence at the next rescore. Evidence that isn't public can count through an evidence review.
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Get in touch →Strongest on Carbon Footprint — Operations and Transparency & Accountability (8/10, 6/10). Weakest on Nature & Biodiversity Impact and Water Impact (3/10, 3/10).
The 3 companies in the sector scoring nearest above altafiber.
T-Mobile leads on emissions reduction and renewable energy but has serious gaps in nature, water, and biodiversity reporting.
See the breakdown →Orange has strong near-term emissions cuts (38.6% Scope 1+2 vs 2015) and SBTi-validated 2040 net-zero targets, but recent momentum has stalled—operational emissions rose 4.73% year-on-year in 2024.
See the breakdown →altafiber's score has been reviewed 2 times and currently stands where it started, at 48.
Bio correction, score unchanged. Founded-year rule (year the current company was created; earlier history as "its roots go back to"): founded null -> 1983, per FY2025 Form 10-K p.24 ("incorporated under the laws of Ohio in 1983"; https://www.sec.gov/Archives/edgar/data/716133/000119312526115350/ck0000716133-20251231.htm); description now says its roots go back to 1873. Revenue "~$1.1B" -> "$1.1B (FY2025)" (10-K segment note: total revenue $1,107.2M FY2025).
Initial public score 48 (publish-draft)
The formula and all 11 sources.
Same ten questions for every company. No private weighting.
SINK = (0.3 × Base + 0.7 × Performance) × Scale11 sources used in this assessment. All publicly available. Each row shows which of the ten questions it informed.
“This GHG inventory has been independently verified by a third-party auditor, Cameron-Cole, LLC.”
“We reduced overall emissions 11.4% from 2021 to 2025”
“science-based net zero emissions target by 2040, covering scope 1 and 2 emissions”
“includes 184 panels, which produce 116,000 kilowatt-hours of power annually”
“accused in lawsuits of allegedly overloading some of the power poles with their communications wires and attachments”
If you believe a source has been misread or a newer version exists, submit a challenge.
altafiber is a US telecommunications operator providing fiber and broadband infrastructure, primarily in the Midwest and Hawaii. Its roots go back to 1873 as a Cincinnati telephone company; the current company was incorporated in Ohio in 1983. It has about 2,100 employees (FY2025 Form 10-K) and is owned by Macquarie. The company runs Hawaiian Telcom as a subsidiary and files SEC disclosures despite private ownership.
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