| 360 Electric Services Inc | C10 | 2026 | Active |
| 3a Construction & Maintenance Inc | C10 + A, B | 2026 | Active |
| A 2 Z Technologies Inc | C10 | 2002 | Active |
| A-C Electric Company | C10 + A, B, C12 +1 | 1948 | Active |
| Acme Services Inc | C10 + B, C7 | 1997 | Active |
| Advanced Combustion & Process Controls Inc | C10 | 2010 | Active |
| Advanced Electrical Inc | C10 | 2014 | Active |
| Agilitech | C10 + A | 2007 | Active |
| Aic Heating And Air | C10 + B, C20, C46 | 2017 | Active |
| Alfa Electric | C10 | 2011 | Active |
| All Phase Electric | C10 | 2004 | Active |
| All-Tech Fire & Security Inc | C10 + C16 | 2015 | Active |
| Alpha Omega Electric | C10 | 2016 | Active |
| American Automation Services Inc | C10 | 2020 | Active |
| American Electric | C10 | 2025 | Active |
| American Electrical Services | C10 | 2015 | Active |
| Anderson Group International | C10 + ASB, B, D64 +1 | 2000 | Active |
| Andy's Electrical Services | C10 + D42 | 2016 | Active |
| At Electric | C10 | 2026 | Active |
| Axis Contracting Corp | C10 + B | 2024 | Active |
| B & C Electric LLC | C10 | 2022 | Active |
| Bakersfield Electric LLC | C10 | 2018 | Active |
| Bakersfield Lighting Inc | C10 + C45 | 2012 | Renew by Dec 31, 2026 |
| Bakersfield Lighting Repair Service | C10 + C45 | 2007 | Active |
| Barron Construction Builders Inc | C10 + B | 2026 | Active |
| Bis Technologies And Communications Inc | C10 | 2021 | Active |
| Blake's Electrical LLC | C10 | 2026 | Active |
| Braun Electric Company Inc | C10 + B | 1990 | Active |
| Bronco Electric Inc | C10 | 1982 | Renew by Nov 30, 2026 |
| C G I | C10 | 2023 | Active |
| C J Logan Pump & Electric Inc | C10 + C57, D21 | 2015 | Active |
| C2c Fueling Inc | C10 + A, B, HAZ | 2024 | Active |
| Cal Contractor Services Inc | C10 + B, C20, C39 +1 | 2022 | Active |
| Cal Pacific Constructors Inc | C10 + A, B, C12 +3 | 2015 | Active |
| Cal State Communications Inc | C10 + C7 | 2017 | Active |
| Camp S A Pump Company | C10 + A, C57, D21 | 1977 | Active |
| Carbajal Electric Inc | C10 | 2021 | Active |
| Cognati Construction Inc | C10 + A, B | 2007 | Active |
| Community Outreach Services | C10 + B, C20, C36 +1 | 2018 | Active |
| Control Fire Protection Inc | C10 + B, C16 | 1988 | Active |
| Core Energy Construction Inc | C10 | 2026 | Active |
| Croad Electric & TH Inc | C10 | 2008 | Active |
| Curtis Electrical Construction Inc | C10 | 2008 | Active |
| D Squared Electrical Services Inc | C10 | 2018 | Active |
| DC Electric | C10 | 2019 | Active |
| Delta Construction & Mechanical LLC | C10 + B, C20 | 2017 | Active |
| Discount Construction & Engineering | C10 | 2023 | Active |
| Diversified Utility Services Inc | C10 + A, B, D31 | 1997 | Active |
| DLS Electrical Inc | C10 | 2016 | Active |
| DNS Electric Inc | C10 | 1989 | Active |
| Drafting & Design Services | C10 + B | 2004 | Active |
| Dunbar Ken & Sons Inc | C10 + B, C20, C21 +2 | 1978 | Active |
| Dunn Kevin Electric Inc | C10 | 1990 | Active |
| Ea Electric LLC | C10 | 2024 | Active |
| Electric Technology Group | C10 | 2023 | Active |
| Elevation Electrical Services Inc | C10 | 2026 | Active |
| Elite Automation & Electrical Services Inc | C10 | 2014 | Active |
| Elite Industrial Solutions Inc | C10 | 2025 | Active |
| Elo & Sons Electric Inc | C10 | 2023 | Active |
| Encharge Energy | C10 + C46 | 2023 | Active |
| Energy Management Solutions Inc | C10 | 2007 | Active |
| Esqueda Electrical Services | C10 | 2021 | Active |
| Express Electric Inc | C10 | 2004 | Active |
| Flavio H Electric | C10 + B | 2008 | Active |
| Fuzion Energy | C10 + B, C20, C39 | 2017 | Active |
| G C E Industries | C10 | 2011 | Active |
| Garcia Powered Electric Inc | C10 | 2017 | Active |
| Geiger-Castro Construction Inc | C10 + B, C8 | 2023 | Active |
| Gill & Sons Enterprises Inc | C10 + A, B, C16 +1 | 2022 | Active |
| Gold Coast Electric Inc | C10 | 1999 | Active |
| Golden Empire Electric | C10 | 1983 | Active |
| Golden State Electrical Services Inc | C10 | 2013 | Active |
| H & H Electric Services Inc | C10 | 2026 | Active |
| Hall R L Enterprises Inc | C10 + B | 1995 | Active |
| Hance Construction | C10 + A, B | 2024 | Active |
| Hardcastle Specialties Inc | C10 + A, C16 | 2011 | Active |
| Hardin Electrical Services | C10 | 2024 | Renew by Dec 31, 2026 |
| Haven Power Solutions LLC | C10 | 2026 | Active |
| HPS Plumbing Services | C10 + A, B, C2 +8 | 2001 | Active |
| Hugh Electric Inc | C10 | 2017 | Active |
| Ic Electric Services Inc | C10 | 2017 | Active |
| Icon Electric LLC | C10 | 2023 | Active |
| Impact Electric Sun Inc | C10 | 2022 | Active |
| Imperial Energy Electric Inc | C10 + B | 2023 | Active |
| Industrial Controls Group Inc | C10 + B | 1990 | Active |
| Industrial Electric Construction & Maintenance_co | C10 | 2014 | Active |
| Ivs General Contractor | C10 + C7, D34 | 2003 | Active |
| J B Electrical Services Inc | C10 | 2011 | Active |
| J E Electric & Construction Services Inc | C10 + B | 2018 | Active |
| J T S Construction | C10 + A, B, C8 | 1995 | Active |
| Jab Communications Inc | C10 + C7 | 2018 | Active |
| Jarrett Electric Inc | C10 | 1993 | Active |
| JD Mechanical & Son Inc | C10 + C20 | 2016 | Active |
| Jeff Periera Home Energy Inc | C10 + C46 | 2009 | Active |
| Jennings Electric | C10 + D21, D24 | 2021 | Active |
| K N Z Electrical Inc | C10 | 2022 | Active |
| KC Electric Inc | C10 + C54 | 2021 | Active |
| Kern County Construction Inc | C10 + A, B, HAZ | 1985 | Active |
| Kern Technical Solutions Inc | C10 | 2025 | Active |
| Knight's Pumping & Portable Services Inc | C10 + C13 | 2001 | Active |