{"nrhp_refnum":"10000774","name":"PG&E Powerhouse","other_names":["PG&amp","E River Station","Sacramento River Station B"],"category":"building","location":{"address":"400 Jibboom St","address_restricted":false,"city":"Sacramento","county":"Sacramento County","state":"CA","lat":38.54428700150004,"lon":-119.21342341798729,"geom_source":"nps_gis"},"listed_date":"2010-09-23","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Industry","Architecture"],"significance_levels":["local"],"summary":{"what_it_is":"A two-to-three-story reinforced concrete steam power plant on Jibboom Street in Sacramento, California, between Interstate 5 and the Sacramento River. Willis Polk designed it in 1912 for Pacific Gas and Electric Company.","why_significant":"The nomination argues the building is a sophisticated example of Beaux Arts/Classical Revival utility architecture by master architect Willis Polk, one of three of his works in Sacramento. It also served as an important part of PG&E's regional power system that supported Sacramento's early 20th century growth and industrialization.","narrative":"Built in 1912 beside the Sacramento River, this steam-powered electric plant was designed by San Francisco architect Willis Polk for Pacific Gas and Electric Company. It was built as an auxiliary source of power and a voltage-transforming station, partly because of fears that demand would outrun the Folsom hydroelectric plant. The reinforced concrete building has two joined blocks: a boiler wing to the south and a taller generator hall to the north. Its west front, facing the river, has a tall arch, a classical door and a cartouche supported by sculpted male figures, with cement plaster scored to imitate stone courses. The plant was upgraded in 1924 with a fourth generator. Its boilers, generators, stacks and wharf have since been removed, and the boarded building is vacant. It was listed for its role in Sacramento's electric power history and as an example of Beaux Arts design by Polk, who also designed other Sacramento landmarks.","period_of_significance":"1912-1957","architect_builder":"Polk, Willis","architectural_style":"Beaux Arts Style","criteria":["A","C"],"status_note":"Listed as vacant/not in use; windows and roof monitors are boarded, and all generating equipment has been removed, leaving a concrete shell.","vacant_flag":true,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:54:29.67832-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_CA/10000774.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/10000774/14ef6e8a6c-800.webp","url_1600":"https://nationalhistoricalregister.com/media/10000774/14ef6e8a6c-1600.webp","licence":"CC BY-SA 3.0","author":"Oscarmostofi","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:PG%26E_PowerHouse.jpg\" rel=\"noopener\">Oscarmostofi</a>, <a href=\"https://creativecommons.org/licenses/by-sa/3.0\" rel=\"license noopener\">CC BY-SA 3.0</a>, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:PG%26E_PowerHouse.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/123860644","wikipedia":"https://en.wikipedia.org/wiki/PG%26E_Powerhouse","wikidata":"https://www.wikidata.org/wiki/Q126203932"},"indexable":true,"url":"https://nationalhistoricalregister.com/california/sacramento-county/pg-and-e-powerhouse-10000774/"}