# SEMASS Resource Recovery

ISO-NE asset profile · https://askthegrid.com/assets/facilities/semass-resource-recovery

SEMASS Partnership - Plymouth County - ISONE

SEMASS Resource Recovery is a municipal solid waste power plant in Plymouth County, Massachusetts, with two operating generating units totaling 98.5 MW of nameplate capacity (80.0 MW net summer). The facility is currently owned by Reworld, the waste-to-energy company formerly known as Covanta. Located off Cranberry Highway in the Rochester/West Wareham area, SEMASS serves nearly 40 participating communities across Cape Cod, southeastern Massachusetts, and the Boston metropolitan area with waste disposal and electricity. Since starting up in 1988, the facility has processed more than one million tons of municipal solid waste a year, more than a fifth of all MSW generated in Massachusetts annually. Both of the plant's generating units remain in service, with no whole-plant retirement scheduled in EIA's generator records.

## Metrics

- **Nameplate capacity:** 98.5 MW — Canonical EIA plant baseline.
- **Registry anchor:** Plant 50290 — plant-50290

## Facts

- **Technology:** Municipal Solid Waste
- **Operator:** Reworld Waste, LLC

## Related parties

- **Operator / asset manager:** Reworld Waste, LLC — Current operator and public-facing facility brand ([source](https://www.reworldwaste.com/where-we-are/semass))
- **Acquirer / investor:** EQT Infrastructure V — Current parent-company owner through acquisition of Covanta ([source](https://eqtgroup.com/))
- **Owner / acquirer:** Covanta Energy Corporation — Former owner and operator (2005–2021) ([source](https://www.covanta.com/))
- **Owner / acquirer:** American Ref-Fuel Company of SEMASS, L.P. — Majority owner (1996–2005); later sold to Covanta
- **Former owner / developer:** Energy Answers Corporation — Original project developer and technology developer
- **Construction contractor:** Bechtel — Plant engineering (original design phase); EPC scope not confirmed by cited sources ([source](https://www.bechtel.com/))
- **Equipment supplier:** General Electric — Steam-turbine manufacturer (54 MW Unit 1 generator) ([source](https://www.gevernova.com/gas-power/products/steam-turbines))
- **Construction contractor / equipment supplier:** Hamon Research-Cottrell — Air-pollution-control equipment contractor

## Sources

- [steamturbinesolutions.com](http://www.steamturbinesolutions.com/wp-content/uploads/STS-Experience-List-2016.pdf) — steamturbinesolutions.com · public_source — Source retained for exact-record publication review.
- [eqtgroup.com](https://eqtgroup.com/en/news/covanta-and-eqt-infrastructure-to-create-the-leading-sustainable-waste-solutions-provider-driving-compelling-value-for-all-stakeholders) — eqtgroup.com · public_source — Source retained for exact-record publication review.
- [wtert.org](https://wtert.org/wp-content/uploads/2020/10/1990-National-Waste-Processing-Conference-01.pdf) — wtert.org · public_source — Source retained for exact-record publication review.
- [wtert.org](https://wtert.org/wp-content/uploads/2020/10/nawtec08-0015.pdf) — wtert.org · public_source — Source retained for exact-record publication review.

---

Canonical page: https://askthegrid.com/assets/facilities/semass-resource-recovery
Website: [Reworld](https://www.reworldwaste.com/where-we-are/semass)

Source: Ask the Grid — https://askthegrid.com/