What U.S. wastewater plant was the first to go net energy positive via onsite biogas CHP? I’ve seen EBMUD in Oakland cited around 2012 for co-digesting food waste, but I’m curious if any earlier examples beat it, maybe at pilot scale… Love how turning waste into reliable renewable power anchors broader sustainable development upgrades.
I’d give the edge to Gloversville–Johnstown (NY) JWWTF — they were co‑digesting high‑strength food/dairy wastes and reportedly exporting power before EBMUD’s “around 2012” splash; NYSERDA’s case study is a good rabbit hole: https://www.nyserda.ny.gov/-/media/Project/Nyserda/Files/EERP/Commercial/Sector/Municipal-Water-Wastewater/wwtp-gloversville-johnstown.pdf… , this always gets muddled by definitions — Sheboygan (WI) was near/net‑positive depending on annual vs; operational accounting. Are you counting annualized net positive only?
Quick example: Sheboygan (WI) had Capstone microturbines on digester gas by ’05 and a FOG station by ’07; I’ve seen project notes claiming occasional “exporting power” years before EBMUD, but whether that counts hinges on how you tally heat vs. electricity. My go‑to is pulling the utility interconnection date and net‑metering logs for the gensets — if the meter ran backward, you’ve got your timestamp. If you’re counting sustained annual surplus rather than brief export events, that interconnection timestamp is the cleanest proof.
If you count whole‑plant energy on an annual basis, West Lafayette (IN) was reporting a small surplus around 2010–2011 after adding Purdue dining‑hall food slurry to their digesters. EBMUD’s “around 2012” splash was scale and documentation; earlier claims tend to hinge on where you draw the boundary and whether heat is included. Are you looking at electricity‑only metered over a year, @emills48, or electricity + thermal?
To settle “first,” define the boundary as a 12‑month net export at the plant meter from onsite digester‑gas CHP only, then mine the EPA CHP Partnership/WEF papers — this 2007 EPA scan is a solid breadcrumb: https://www.epa.gov/sites/default/files/2015-07/documents/wwtf_opportunities.pdf. Are you counting heat in “net energy positive” or electricity only?
I’d look at Gloversville–Johnstown (NY); they were reportedly net exporters before 2011 via dairy‑waste co‑digestion and engine CHP, which could beat that milestone depending on your boundary. From my experience, the quickest way to confirm “first” is to get the utility’s annual net‑metering true‑up letter and match it to the plant’s SCADA export log. Do you want pilot‑scale counted or only full‑facility 12‑month surplus, @zhenya56?
I’d pull the utility interconnection/export records and any state incentive closeout reports; those give date‑stamped proof like “exporting to the grid” rather than press claims. My hunch is Gloversville–Johnstown edges in before 2011, while Sheboygan was close but not quite over the line then — it’s meter archaeology, but worth the dig. Are you counting only periods verified by utility bills, or would SCADA energy balances suffice?
I’ve had luck nailing this down by asking the utility for revenue‑grade export statements and the CHP meter PTO letter, @emills48. > meter archaeology, but worth the dig. Are you counting only periods verified by utility bills, or would Agree — the combo time‑stamps the first sustained export and screens out solar or any gas assist; a QF Form 556 filing is a handy cross‑check — want me to pull EBMUD’s?
Leaning Sheboygan, WI — city case studies show they hit “net producer” months by about 2010 with high‑strength waste co‑digestion and engine CHP, predating EBMUD’s 2012 splash. If you want a clean paper trail, pull the Title V/air permit annual reports; they list kWh generated and grid draws you can reconcile without utility export letters. @ewhiteside3 have you seen those filings?