Last updated 2026-08-18
TL;DR
You need a C-10 electrical contractor license from California’s CSLB for any temp power work over $500. First-year costs run $5,000 to $15,000: a $450 application, $300 corporate license, two $100 exams, a $150 bond, liability insurance near $504, and a generator. The licensing path takes 3 to 6 months from application to active number.
Do you need a license for temp power in California?
Yes. California law (Business & Professions Code § 7028) says anyone doing electrical work on a project where labor and materials pass $500 must hold a C-10 Electrical Contractor license [2]. Temp power counts. Connecting a generator to a distribution panel, running temporary cables, standing up a 480V system, all of it is electrical work under the code. The Contractors State License Board (CSLB) enforces the rule. If a customer rents a plug-and-play generator and connects it themselves, you might stay outside the license requirement. The moment your crew touches wiring, you need the C-10. Most temp power operators in California get it up front because it covers the full scope and keeps you clear of citations and stop-work orders. The CSLB can issue civil penalties up to $5,000 for unlicensed contracting [8].
How much does it cost to start a temp power business in California?
A realistic first-year budget lands between $5,000 and $15,000. Where you fall depends on three things: new versus used generator, how much insurance you carry, and your business structure. The lean path pushes under $5,000. Pass the C-10 exam yourself as a sole owner, rent a generator per job, and carry only the liability insurance clients demand. A more typical setup runs closer to $7,500: a corporation, a decent used 15kW diesel generator, and full insurance. The chart below breaks it down using 2024 market numbers for a corporate entity buying a basic generator.
What licensing fees will you pay CSLB?
The CSLB charges three separate fees for a C-10: application, initial license, and exams. As of 2024, the application fee is $450 [1]. Corporations and LLCs pay a $300 initial license fee. Sole owners pay $200, partnerships $250 [1]. The two required exams, law & business and the electrical trade, cost $100 each, $200 total [1]. That puts the minimum CSLB bill at $850 for a sole owner and $950 for a corporation. You’ll also post a $15,000 surety bond before the license activates (the bond premium runs about $150 a year, covered next). None of these fees are refundable if you fail an exam, so budget for a retake if you need one.
How much are the bond, insurance, and other startup costs?
California requires every C-10 contractor to post a $15,000 surety bond before the license goes active [4]. You buy it from a surety company. Premiums start at 1% of the bond amount, so as little as $150 a year with good credit [4]. Then comes liability insurance. The CSLB doesn’t require general liability for licensure, but nearly every client and jobsite will make you carry it. NEXT Insurance reports a median of $42 a month, about $504 a year, for electricians in California [5]. Workers’ comp is mandatory the moment you hire an employee, and optional while you’re the only worker. You’ll pay a one-time fee to form your business entity with the California Secretary of State: $70 for an LLC, $100 for a corporation [3]. City business licenses usually run under $100. Add it up: bond ($150) plus liability ($504) plus registration ($100) equals about $754 a year on top of the CSLB fees above.
How much do generators and the 480V kit cost?
The generator is your biggest single outlay. A new 15kW diesel portable, like the Generac 15000E, retails around $6,000 [7]. Used units land in the $2,500 to $4,000 range. You’ll also need temporary cabling, distribution boxes, and adapters for 480V three-phase work. One fixed-cost item that gets new operators connected fast is TempPowerPath’s Cable + Fuel + 480V Kit at $179 one-time. It bundles the specific cable types and a fuel stabilizer package so you’re not chasing parts across three suppliers. If you rent a generator per job instead, daily rates for a 15kW unit in California average $150 to $300 plus delivery. Buying beats renting fast once you have steady work.
How long does it take to get licensed in California?
Plan on 3 to 6 months from the day you submit your CSLB application to holding an active license number. The CSLB takes roughly 8 weeks to review the application [6]. If yours is complete and accepted, you get a notice to schedule your exams. PSI testing centers across California offer exam dates often, so you can usually sit within a couple of weeks. You can pass both exams the same day or across a few weeks. After you pass, you still submit your bond, fingerprint results (part of the background check), and proof of workers’ comp if it applies. The CSLB then issues the license in 2 to 3 weeks. It’s rarely faster than 3 months. Add a month of study before the exam and you’re comfortably at 4 to 5 months.
Do you need local permits for temporary power setups?
Often, yes. A C-10 license lets you pull electrical permits, and many temporary power installations still need a local permit from the city or county building department. Setting up a generator and panel at a festival may require a temporary electrical permit, which runs $100 to $400 depending on the jurisdiction. Check with the authority having jurisdiction (AHJ) before you bid a job. Some California cities offer expedited permits for emergencies, but standard processing tracks building permit timelines, often 1 to 2 weeks. Build this into your project pricing.
How do California startup costs compare to nearby states?
California’s startup costs sit close to other states that require electrical contractor licenses, though the CSLB fees run slightly above the median. Arizona comes in about $1,000 cheaper on licensing. Florida’s electrical contractor license runs about $100 more. See our detailed breakdowns for temp power cost in Arizona, temp power cost in Colorado, temp power cost in Florida, temp power cost in Idaho, and temp power cost in Alabama.
What do first-year operations actually cost?
Once you’re licensed and equipped, your recurring costs shift to fuel, generator maintenance, and insurance renewals. Diesel for a 15kW generator running 8 hours runs $50 to $80 a day at current California prices. Keep a repair cushion; a $200 service call is common. The revenue side holds up. Temp power for events or construction sites often bills at $500 to $1,500 per job. After year one, many operators report net profits of $40,000 to $80,000. The one-time kit from TempPowerPath helps standardize your cable and fuel setup so you’re not rebuilding it on every job.
Ready to start? Next steps
Serious about launching in California? Start by studying for the C-10 exam with CSLB’s study guides. File your application and your business entity in parallel. Get quotes for your bond and insurance now so they’re ready the moment the CSLB asks. For a quick-start equipment bundle, check TempPowerPath’s $179 kit at /start. Then bid small jobs and build a reputation one clean install at a time.
Frequently asked questions
Do you need a license for temp power in California?
Yes. A C-10 Electrical Contractor license from the CSLB is required when a project’s labor and materials pass $500. Connecting a generator to a panel or running temporary feeders counts as electrical work. Unlicensed contracting can draw civil penalties up to $5,000.
How much does a C-10 license cost in California?
The CSLB application fee is $450. The initial license fee runs $200 to $300 depending on entity type, and the two exams total $200. Expect a total CSLB bill of $850 to $950, plus a $15,000 surety bond that costs about $150 a year in premium.
How long does it take to get a C-10 license?
From application to active license, plan on 3 to 6 months. That covers CSLB review of about 8 weeks, exam scheduling, passing both tests, and submitting your bond and fingerprints. After you pass, the board issues the number in 2 to 3 weeks. Add study time before you sit for the two exams, which pushes many people to 4 or 5 months.
What is the $15,000 surety bond for?
The bond guarantees you’ll follow contracting law and pay valid claims against you. It’s required to activate your C-10. The amount is $15,000, and premiums often start around $150 a year with good credit. You must keep the bond in force the entire time the license is active, or the CSLB can suspend it.
Can I rent a generator instead of buying one?
Yes. Renting works well for infrequent jobs. Daily rental for a 15kW unit in California often runs $150 to $300 plus delivery. But a used diesel in the $2,500 to $4,000 range pays for itself in a year if you have steady work. Run the math on your expected job count before you commit either way.
Do I need workers’ compensation insurance as a sole owner?
California law doesn’t require sole owners with no employees to carry workers’ comp, but you must be able to prove your exempt status. The moment you hire any employee, you need coverage in force immediately. Skipping it once you have staff is a fast way to a stop-work order.
Is a business license required in California?
Your business entity registers with the Secretary of State if it’s an LLC or corporation, and many cities also require a local business license. City licenses commonly cost $25 to $100 a year. Check with the city where you’re based and any city where you regularly work.
How do I pass the C-10 electrical trade exam?
The exam covers the National Electrical Code and California-specific amendments. CSLB’s study guide and a prep course go a long way. The trade exam is multiple choice, and you sit it alongside a separate law & business exam. Most people who fail underestimated the code sections, so drill those hardest.
What kind of insurance do I need for temp power jobs?
General liability is standard, and most clients ask for $1 million in coverage. Premiums start around $42 a month in California for electricians [5], roughly $504 a year at that median. The CSLB doesn’t require general liability to issue a C-10, but nearly every jobsite will. Keep certificates of insurance ready when you bid.
How do I get a permit for temporary power at a construction site?
You or your client applies for an electrical permit from the local building department. Your C-10 license lets you pull it yourself. Fees vary by jurisdiction, often $100 to $400, and processing usually takes 1 to 2 weeks. Confirm with the authority having jurisdiction before you bid the job.
Can I start as a sole proprietor without forming an LLC?
Yes. You can hold a C-10 as a sole proprietor, and the CSLB application treats sole owners the same on scope. An LLC or corporation can add liability protection between the business and your personal assets, which is why many operators form one once revenue picks up.
I already have a general contractor’s license (Class B). Do I still need a C-10?
A Class B license doesn’t cover electrical contracting. You need a C-10 or you subcontract the electrical work to a C-10 holder. Connecting generators, running temporary feeders, or standing up a 480V distribution setup is electrical work. Doing that on a B license alone can draw a citation up to $5,000.
Sources
- CSLB Fee Schedule: Application fee $450, initial license $200-$300, exam fees $100 each.
- California BPC § 7028: Contractors license required for work over $500.
- California Secretary of State Business Fees: LLC articles of organization filing fee $70.
- ProSure Group California Contractor Bond: California $15,000 contractor bond cost starts at 1% of the bond amount, typically $150/year.
- NEXT Insurance Electricians Median Cost: Electricians pay a median of $42/month for general liability insurance from NEXT.
- CSLB How to Apply Processing Time: Application processing takes approximately 8 weeks.
- Zoro.com Generac 15kW Diesel Generator Listing: Generac 15kW diesel generator price $5,999.99.
- California BPC § 7028.13: Civil penalty up to $5,000 for unlicensed contracting.