What is a Merchant Power Purchase Agreement (PPA)?

Definition

A Merchant Power Purchase Agreement (Merchant PPA) is a particular type of long-term power purchase contract. In this setup, the buyers are usually electricity traders or more specifically renewable energy traders who take the output from a specific generation facility and sell it on the open market at current market rates. Merchant PPAs are most often associated with renewable energy projects—especially wind and solar power—where the electricity is fed straight into the market instead of being sold under a fixed-price arrangement.

What sets a Merchant PPA apart from other PPAs?

A conventional Power Purchase Agreement (PPA) is a long-term electricity supply contract between a power producer—typically the operator of a wind or solar farm—and an offtaker. The agreement sets out both the delivery and purchase of the electricity generated (or a defined share of it). Just as important, the price—or the underlying pricing structure—is fixed for many years, providing both parties with stability and predictability.

A Merchant PPA works on a fundamentally different basis. Here, the offtaker is not a utility or a large industrial consumer but a trader (hence the term merchant) who commits only to marketing the electricity from a specific generation facility in exchange for a commission. Crucially, there is no agreement on a fixed electricity price. Instead, the power is sold at prevailing market rates—typically on the spot market of an energy exchange (such as EPEX Spot) or through short-term contracts.

Are all PPAs with traders necessarily Merchant PPAs?

No. While PPAs were once almost exclusively signed between power producers and either industrial companies or utilities, electricity traders are now increasingly appearing as contractual partners in more conventional PPA structures as well. In these agreements with generators, they act as the offtaker, while in dealings with consumers or utilities, they take on the role of supplier.

Just like in other PPAs, different types of price guarantees can be negotiated. These may include a fixed purchase or delivery price expressed in euros per megawatt hour (EUR/MWh), or price floors and caps that limit exposure to spot market volatility.

The conditions regarding the contracted electricity volumes also closely resemble those found in PPAs between producers and end consumers. Even though traders are involved in such contracts, they are generally not referred to as Merchant PPAs.

Are Merchant PPAs, like other PPAs, also considered hedging contracts?

The combination of price guarantees and offtake commitments in conventional PPAs effectively redistributes financial market risks between the contracting parties. In this sense, they serve as hedging instruments. For a long time, it was mainly the buyers who acted as providers of security: they absorbed the producer’s price and marketing risks, while in return securing—at least in expectation—favorable purchase prices for themselves.

Electricity traders act as PPA partners on both sides of the value chain, providing security to producers as well as to consumers by offering price guarantees and commitments to purchase or deliver electricity. Because they assume the risks of many different market participants, this role is often described as risk warehousing.

Producers and buyers—acting as the risk-protected parties—use conventional PPAs with hedging mechanisms to increase the level of business planning certainty they need in order to focus on their core operations. On the producers’ side, capital providers often even require PPAs with a hedging effect as collateral for financing or investing in renewable energy projects.

A Merchant PPA, by contrast, does not serve as a hedging instrument. While such agreements can, in theory, include an offtake commitment—since the trader promises to market the electricity from a facility—this does not provide financial security for the producer, as revenues remain uncertain. In practice, the trader mainly delivers services related to electricity marketing, such as placing bids on the exchange, managing balancing groups, and handling other energy market processes.

In fact, even the offtake commitment can sometimes be rendered meaningless when market prices turn negative. In such cases, it is often in the producer’s own interest to release the PPA partner from the obligation to sell power by temporarily curtailing production—otherwise, selling electricity would generate losses.

As a result, Merchant PPAs do not provide the hedging function that conventional PPAs typically offer, since the full market price risk remains with the producer. This marks a fundamental difference from traditional PPA structures.

Are there Merchant PPAs that also include Hedging?

Pure Merchant PPAs are defined by the fact that they do not include a hedging effect—and therefore also do not involve hedging costs.

It is important to understand that revenue expectations under any “merchant” arrangement are generally higher than under other types of PPAs. Every hedging transaction represents a trade-off: exchanging part of the potential revenue for reduced risk. By staying fully merchant, a producer carries the highest level of risk—but also retains the highest revenue potential.

This can, in certain cases, even be seen as an advantage, as will become clearer later. Still, there are complementary risk management measures that can be applied alongside Merchant PPAs.

Rolling Hedges

Rolling hedges are a strategy in which part of a producer’s output is continuously sold through short- to medium-term forward contracts. For example, every three months the producer might agree on futures contracts for delivery one year ahead. In this way, a portion of the revenues can be locked in, while the remaining share is left exposed to market price risks.

This approach is particularly suited to so-called liquid PPAs, which allow for quick and straightforward hedging.

Here’s an example of how a rolling hedge with futures could work if the buyer purchases 20 percent of the contracted volume in each of the five years leading up to delivery.

Floor Models

Even in Merchant PPAs, it is possible to agree on a minimum payment per megawatt hour—known as a floor—that the trader guarantees to the producer. This provides a safety net against very low market prices. However, such protection comes at a cost: producers typically have to accept a higher trader’s margin in exchange for this additional security.

Options and Structured Products

Producers can also hedge against extreme price swings—alongside a Merchant PPA—by using various derivatives, particularly electricity price options. This allows them to retain exposure to the market while still putting safeguards in place. The trade-off is obvious, though: such protection never comes free of charge.

Combination with Battery Storage (BESS)

With battery storage (BESS), electricity can be stored during periods of low prices and sold later when prices are high. This enhances the revenue potential of the merchant model. Whether this should be viewed as a hedge for a wind or solar plant, or as a standalone business model in its own right, is ultimately a matter of perspective.

When does a Merchant PPA make sense?

Since Merchant PPAs lack several key elements of other power purchase agreements, they also do not fulfill the classic functions of long-term electricity supply contracts. Most notably, they cannot serve as a hedge against market price fluctuations. As a result, their value in project financing is limited—investors, lenders, and equity partners tend to give Merchant PPAs little weight when calculating financing terms.

That said, there are still strong and valid reasons why operators of wind and solar plants choose to enter into Merchant PPAs with electricity traders.

Limited Demand for PPAs

In some cases, Merchant PPAs can be seen as a fallback option. This is particularly true in markets with a high number of renewable energy projects where demand for conventional PPAs on the buyer side does not always match the available supply.

For example, an operator may already have secured long-term PPAs for 80 percent of a wind or solar park’s capacity, but choose a merchant arrangement for the remaining 20 percent, with the idea of negotiating a more favorable hedge at a later point.

Since many investors lack the expertise to handle electricity trading themselves, they often hand this part of the business over to experienced power traders.

Above-Average Risk–Return Profile

Plant operators or investors may choose to take on risk deliberately in order to benefit from price spikes in the volatile spot market. For wind and solar plants, this is generally challenging because favorable weather conditions often lead many installations to generate electricity simultaneously—pushing prices down.

However, a solar park built at a location with unusually strong irradiation in the morning or evening might support a different conclusion: such a setup could deliver higher revenues by capturing value during hours when market prices are stronger. A key factor in this calculation is the cost of hedging—every hedge carries a price, and the more rigid the guarantee, the higher the margin typically charged for it.

Market Entry after Financing or Subsidy Periods through Merchant PPAs

A strategy that focuses more on opportunity than on security is particularly common for assets that have already paid off their initial investments. An example can be found in Germany: In the mid-2020s, many plants that were originally refinanced through Germany’s EEG surcharge scheme, will leave the public support scheme. Today, those subsidies have expired, the loans have been repaid—yet the facilities continue to generate electricity.

In such cases, owners are often more willing to take on risk, since they no longer face ongoing debt obligations. At the same time, it is sometimes uncertain how long these plants will keep running before maintenance and repair costs begin to outweigh revenues. Under those circumstances, a conventional PPA might actually represent the riskier option.

Combining a Merchant PPA with Battery Storage

Solar PV plants are particularly well suited for pairing with a battery or another form of electricity storage. Most of their generation occurs around midday—precisely when many other PV systems are also producing near peak output. As a result, power prices at those hours tend to be comparatively low.

By storing electricity during these low-price periods and releasing it just a few hours later, producers can often achieve significantly higher prices. These indirect “arbitrage gains,” however, can only be realized by participating in the spot market. They are not available if the electricity has already been committed under a conventional PPA.

Conclusion: Merchant PPAs – a Route to Market even without a Hedge

A Merchant PPA is, strictly speaking, not a PPA in the conventional sense but rather a renewable energy trading contract. Unlike other forms of PPAs, Merchant PPAs differ in key respects—the most notable being that they provide no price security (no hedge). In essence, they represent an outsourcing arrangement: electricity trading is handed over to a professional trader, who earns a commission for managing the sales.

Still, Merchant PPAs are a practical tool for marketing power from generation assets. While operators focus on project development, financing, and maintenance, traders take care of the commercial side—selling the electricity on the market. The risk of volatile prices, however, remains entirely with the producer.

For wind and solar operators, this means greater opportunity but also greater risk—and in some cases, higher financing costs compared to a conventional PPA. Lenders often require the price security of a traditional PPA to safeguard their investment, or at the very least demand a risk premium that can exceed the hedging costs a classic PPA would entail.

That said, for already amortized assets, a Merchant Power Purchase Agreement can be an attractive option: it provides a flexible route to market while avoiding the expense of hedging.