Enphase's website emits 1.60 g of CO2 per visit, 4.5× the worst passing grade.

The numbers behind it

Annual figures cover the 29 pages I measured and estimated organic search traffic only, so the real total is higher. Coverage is published so you can judge how representative the number is.

One visit ≈ a 10-watt LED bulb for 19 minutes. A year of estimated search visits to the pages measured ≈ driving a new car 34,300 km. What these numbers mean

Where this site sits in the cohort

Grades A+ to E: up to 0.36 g. No company here.

1. A+up to 0.040 g0 companies
2. Aup to 0.079 g0 companies
3. Bup to 0.145 g0 companies
4. Cup to 0.209 g0 companies
5. Dup to 0.278 g0 companies
6. Eup to 0.359 g0 companies
7. Fabove 0.359 g107 companies

Enphase is the dark bar. The band along the bottom is every passing grade, A+ to E.

Against the other energy companies

Bars share one scale within the sector, lightest first. Energy companies I couldn't measure fairly are listed on the withheld page. See all energy companies.

Why this company is in the index

Listed because: Solar microinverter maker.

Claims: Cleantech

Inclusion is based on a company's own public claims, never on whether it is a client of mine. How this is measured.

Work at Enphase? I can show you which pages carry the weight and what it would take to cut it.

Ask what drives this number · Tell me if this looks wrong