What an EPC performance bond is
An EPC performance bond is a surety bond that guarantees an Engineering, Procurement, and Construction contractor will complete a renewable energy project according to the terms of the EPC contract — on time, on budget, and to specification. It is a three-party agreement between the EPC contractor (the principal), the project owner or lender (the obligee), and the surety company (the guarantor).
If the EPC contractor defaults during construction — through bankruptcy, abandonment, or failure to perform — the surety is contractually obligated to either arrange for project completion through a substitute contractor or compensate the project owner for the financial loss, up to the bond's penal sum. This is the same three-party structure used across all performance bonds, adapted for the specific realities of renewable energy construction.
In renewable energy practice, the EPC bond is almost always a combined performance and payment bond. The performance component guarantees project completion. The payment component guarantees that subcontractors, equipment suppliers, and labor are paid throughout the build. Both are typically written together by the same surety as a single bonding package.
The essential point: project lenders will not close on a utility-scale renewable energy build without a performance bond from a T-listed carrier. The bond is not optional — it is the financial instrument that makes the entire project finance stack possible.
Who needs an EPC performance bond
EPC performance bonds are effectively universal on utility-scale renewable energy construction. The specific parties requiring them:
- Project lenders and tax equity investors — the single largest source of demand. Construction lenders require them at 100% of EPC contract value as a condition of loan closing. Tax equity providers routinely require them at the same level.
- Project owners and IPPs — independent power producers require them to protect their sponsor equity and their expected NTP-to-COD timeline.
- Corporate offtakers — under a corporate PPA, the offtaker frequently requires evidence of surety-bonded construction as a condition of PPA execution.
- Public agency owners — state agencies, municipalities, and utilities that own renewable energy assets require them under standard public-procurement statutes, generally the state's Little Miller Act.
- Federal agencies — DOE, DOD, and GSA renewable energy contracts require them under the federal Miller Act.
Bond amount & premium
Penal sums on renewable energy EPC performance bonds are almost universally set at 100% of the EPC contract value. A $200 million EPC contract requires a $200 million performance bond. Combined with the matching payment bond, the surety's aggregate exposure on a single project can approach twice the contract value.
Premium rates in the standard renewable energy market run from 0.7% to 2.5% of contract value on the combined performance and payment bonds:
| Contractor profile | Approximate rate |
|---|---|
| Investment-grade EPC, seasoned renewable book | 0.7% – 1.1% of contract |
| Established mid-market EPC, solid financials | 1.1% – 1.6% of contract |
| Newer EPC or first bonded renewable | 1.6% – 2.5% of contract |
| Substandard credit or high-risk profile | 2.5%+, may require collateral |
On strong sponsor accounts, the full stack — EPC performance and payment — is written without collateral. On weaker credit, we structure minimum collateral rather than defaulting to 100% cash.
EPC bonds for solar projects
A utility-scale solar EPC contract typically covers module supply and installation, tracker system installation, DC/AC electrical work, medium-voltage collection, substation construction, and interconnection. Modern utility-scale solar EPC contracts commonly range from $50 million to over $500 million, with construction schedules of twelve to eighteen months.
The distinctive underwriting features of solar EPC work relative to conventional construction include the concentration of equipment risk in specific OEM modules, tracker systems, and inverter platforms; the relative simplicity of the civil work compared to conventional heavy construction; the significance of interconnection scheduling risk; and the impact of federal tax credit (ITC and PTC) timelines on the project's economic incentive to reach COD by year-end.
EPC bonds for wind projects
Wind farm EPC contracts cover turbine erection, foundations, access roads, collection systems, and O&M facilities. Utility-scale onshore wind EPC contracts commonly range from $100 million to over $1 billion. The number of turbines, hub height, and site accessibility drive most of the cost variance.
Onshore wind underwriting is a well-developed discipline in the standard market. Offshore wind is a distinctly different underwriting profile — substantially higher penal sums (some approaching multiple billions), longer construction periods (three to five years), specialized marine construction contractors, and materially different loss frequency and severity assumptions. Bonding for offshore wind requires a purpose-built underwriting approach and, on the largest projects, co-surety or reinsurance arrangements.
EPC bonds for hydroelectric & storage projects
Hydro: Small hydro (below 30 MW) and pumped storage projects carry conventional civil-construction underwriting characteristics with the added complexity of environmental permitting under FERC's hydropower licensing framework. Large hydro is uncommon as new-build in the United States but occasional retrofit and re-licensing projects arise.
Battery energy storage (BESS): Battery storage is now treated as a generating facility under FERC Order No. 845 and subsequent rulings, which means standalone BESS projects and hybrid solar-plus-storage projects use the same EPC bonding framework as conventional generation. Underwriting concerns unique to BESS include the concentration of value in specific battery cell manufacturers (LG Energy Solution, CATL, Samsung SDI, BYD), the compression of technology cycles, and the still-developing loss experience for large-scale fire and thermal runaway events.
Also needed by most GCs
Contractor license & permit bonds — all 50 states
Every general contractor working across state lines needs multiple L&P bonds. Surety One writes contractor license bonds, municipal permit bonds and combined license/performance bonds nationwide.
Underwriting an EPC performance bond
New-account EPC underwriting parallels conventional contract surety underwriting with adjustments for the renewable energy risk profile. Key underwriting elements:
- Contractor track record. Prior completed MW by technology, prior largest completed project, prior largest completed project of similar type, and any prior defaults or workouts.
- Financial strength. Working capital, net worth, and the composition of assets and liabilities. Working capital is generally the single most important number in contract surety underwriting.
- Project finance structure. Construction lender, tax equity provider, term debt structure, and the maturity profile of the debt stack.
- OEM concentration. The specific module, tracker, turbine, or battery manufacturer supplying the project. Underwriters consider both the OEM's balance sheet and the diversification of the contractor's OEM relationships.
- Interconnection status. Executed LGIA or equivalent, network upgrade cost certainty, and the interconnection schedule relative to construction schedule.
- Land control and permitting. Fee ownership or long-term site lease, environmental permits, and building permits.
- Force majeure and supply chain provisions. The EPC contract's treatment of module tariff exposure, ILWU labor risk, and OEM delivery delay.
What documentation we need
For a first EPC performance bond submission, the standard documentation set is:
- Executed or draft EPC contract
- Contractor's standard contractor questionnaire
- Last three fiscal year-end CPA-prepared financial statements plus a current interim statement
- Current work-in-progress schedule (WoH form)
- Personal financial statement from principal owners (PFS form)
- Consumer credit report authorization for each personal indemnitor
- Résumés of principal owners, president, senior project managers
- Bank line commitment letter and outstanding balance
- Copy of the required bond form if specified by the obligee
How to apply
Email the submission package to underwriting@suretyone.com, or call (800) 373-2804 to discuss the account before formal submission. For established accounts requesting bonds within existing program limits, most bond requests are turned within hours.
Related pages: renewable energy bond hub, decommissioning bonds, interconnection bonds, procurement bonds.