A hypothetical solar developer with a 150 MW project in the Southwest Power Pool queue obtains an Interconnection Agreement with a $12 million network upgrade security requirement. Or an electricity wholesaler learns they need $10 million of collateral for a counterparty on a Power Purchase Agreement. Their Treasury teams have three ways to post that security: cash, a bank letter of credit, or a surety bond. The third option has been ignored historically, but the environment is changing.
Every step of a transmission or distribution project comes with somebody asking for security against your future obligations. Network upgrade costs on large solar, wind, and storage interconnection queues routinely run into eight figures, and the security demanded against them scales accordingly. Multiply the $12 million requirement above across a developer pipeline and the structure of the collateral starts to matter quite a bit.
Cash is the most expensive option
Posting cash is the simplest path and the most painful one. Every dollar of cash collateral is a dollar that isn’t funding operations and future growth. Cash collateral is a drag on returns until it’s released, which can be years after commercial operation. If your equity is targeting a return in the teens or higher, parking it as collateral at zero is a poor use of capital.
Letters of credit have their own problems
The LC is the conventional alternative, but it has costs of its own that companies underestimate. A standby LC ties up capacity on your bank credit line or requires restricted cash. If your project finance lender or corporate revolver provides $50 million of capacity and $10 million of it is encumbered by an LC supporting an LGIA or PPA, that capacity is gone. It doesn’t earn interest, it counts against covenant ratios, and it can crowd out borrowing capacity. Mid-size developers and growth-stage IPPs hit their LC ceilings quickly.
LC pricing is also creeping higher. Bank LC fees for energy-sector obligors have widened over the last several years as banks have repriced credit exposure to renewables, gas, and energy storage. A facility that cost 100 basis points five years ago may be priced at 200 to 275 basis points now, depending on the bank and the developer’s credit profile. This is especially true for firms backed by private equity.
LCs also come with administrative hassles, including origination fees, documentation, and the occasional drawdown disagreement when a counterparty thinks they have a draw right and you disagree.
What a surety bond actually does
A surety bond is a three-party agreement. The surety, typically an A-rated insurance company, promises to pay the obligee (the utility, ISO, or municipality holding the collateral) if the principal fails to perform. From the obligee’s perspective, the bond does exactly what cash or an LC does. It guarantees that money will be there if you default.
From your perspective, the bond does several things that cash and LCs don’t. It doesn’t consume bank credit capacity. Surety capacity is underwritten separately by an insurance company on its own balance sheet, so your bank facility and surety program operate in tandem. You can carry $20 million of LC capacity and $20 million of surety capacity at the same time without one cannibalizing the other. In fact, the larger your bank facility, the more comfortable your surety will be with issuing credit.
Posting bonds typically doesn’t require restricted cash. The principal pays an annual premium, typically 1 to 2 percent for well-capitalized energy companies, with pricing that varies by credit quality and bond type. The premium is an operating expense, not a capital lockup.
Surety bonds are generally off-balance sheet, which matters for covenant calculations and credit metrics on other facilities. And surety programs scale with your business. Once a surety is comfortable with your financials, your management team, and your project pipeline, additional bonds can be issued in days. The underwriting work is done once and applied across the program.
Where the obligees stand
The biggest practical question is whether the entity holding the collateral will accept a bond in lieu of cash or an LC. The answer varies, and it’s been moving.
FERC has historically been supportive of alternative forms of credit in jurisdictional tariffs, and most ISO and RTO credit policies now allow surety bonds with some conditions, such as an acceptable surety rating, an approved bond form, and specific cancellation and renewal terms. SPP, MISO, PJM, CAISO, ERCOT, and NYISO each publish credit policies you can read directly to see how they treat sureties.
Utilities are more varied. Many investor-owned utilities will accept surety bonds for transmission service deposits and reservation security, sometimes with negotiation on the acceptability of the bond form. Municipal and co-ops are often more flexible. The pattern across the industry over the last decade has been gradual acceptance, with credit policies being updated as treasury and credit teams get more familiar with the product.
When an obligee resists, it’s usually for one of three reasons: the bond form doesn’t match what they want, the surety’s rating is below their threshold, or institutional inertia. That third one is where a knowledgeable agent can help by walking the credit team through the product.
What to look for in a surety relationship
A few things distinguish a surety partner who can actually serve a T&D-focused developer or wholesaler from one who can’t. Capacity matters first. A single-bond capacity of $5 million is fine for retail accounts. A serious energy developer needs single and aggregate capacity well into the eight or nine figures.
Familiarity with the obligee forms is equally important. ISO and RTO credit policies, FERC LGIA security provisions, and utility tariff forms each have their quirks. A surety that has written these bonds before will get the form approved faster than one starting from scratch.
Rating thresholds and speed matter too. AM Best A or better is the practical floor for most energy obligees, along with a Financial Service Rating of at least X. And when a project finance closing, interconnection milestone deadline, or capacity market deadline arrives, bond issuance needs to happen in days, not weeks.
The last thing, and it matters as much as any of the above, is a willingness to actually work the file. Energy surety underwriting isn’t the same as construction surety underwriting. It requires reading project financing structures, understanding tariffs, and pricing risk against a developer or sponsor balance sheet rather than a contractor’s.
The practical question
For any project posting meaningful collateral, the right question isn’t ‘cash or LC’ but ‘what mix of cash, LCs, and surety bonds gets us the best capital efficiency for this obligation.’
The answer depends on the obligee, the bond form, the credit quality of the principal, and the relative pricing of the three options. For many T&D-focused developers, wholesalers, and IPPs, a surety bond is the cheapest option once you account for the opportunity cost on cash and the capacity constraints of LCs.
It’s worth running the math on each tranche of security as it comes up. The default to cash or LC is a habit, not a conclusion.
If you’d like to walk through what a surety program could look like for your transmission, distribution, or generator interconnection collateral, I’m glad to help.
