Power Purchase Agreement

A power purchase agreement (PPA) is a long-term contract between an energy buyer and an energy producer. The buyer agrees to purchase electricity at a predetermined price over a set period, typically 10 to 25 years. The producer agrees to deliver that electricity from a specific generating asset, such as a solar farm or wind installation.

PPAs are foundational to renewable energy development. They provide revenue certainty for project developers, helping secure construction financing. For buyers, they offer price stability and a clear path toward decarbonization goals. 

Without PPAs, many large-scale renewable projects would never get built.

How Does a Power Purchase Agreement Work?

The basic structure involves three elements: 

1. A seller (the energy producer)
2. A buyer (often a utility or corporation)
3. An agreed price per megawatt-hour (MWh) over a fixed contract term

In a physical PPA, electricity flows directly from the generator to the buyer, either through a direct connection or the grid. In a financial power purchase agreement, no physical electricity changes hands. Instead, the buyer and seller settle the difference between the agreed contract price and the market price. If market prices rise above the contract rate, the seller pays the buyer. If prices fall below, the buyer pays the seller.

Both structures achieve the same goal: locking in a predictable energy cost for the buyer and predictable revenue for the seller. An energy yield assessment often informs the pricing and terms before a PPA is signed.

What Are the Main Types of Power Purchase Agreements?

PPAs vary by energy source, buyer type, and contract structure. Here are the most common types:

• Renewable energy power purchase agreement: A broad term covering any PPA tied to a renewable source, including solar, wind, hydro, or geothermal.
• Solar power purchase agreement: The buyer purchases electricity generated by a solar installation. These are common for utility-scale solar farms and commercial rooftop systems.
• Corporate power purchase agreement: A business purchases renewable energy directly from a producer, often to meet internal sustainability targets or regulatory requirements.
• Financial power purchase agreement: A contract-for-difference arrangement where the buyer hedges against energy price volatility without taking physical delivery of electricity.
• Offshore wind power purchase agreement: The buyer contracts for electricity from an offshore wind project. These agreements often involve longer terms due to the higher capital costs of offshore development.

What Are the Benefits of a Power Purchase Agreement?

PPAs offer advantages for both buyers and sellers, including:

• Price stability: Buyers lock in a fixed energy price, protecting against market volatility over the contract term.
• Decarbonization: Corporations can use PPAs to reduce Scope 2 emissions and meet sustainability commitments.
• Project financing: Developers use signed PPAs to secure loans and investment for new renewable projects.
• Budget certainty: Fixed pricing makes long-term financial planning easier for energy-intensive businesses.

For buyers pursuing net-zero targets, a corporate power purchase agreement can be one of the most impactful steps toward reducing their carbon footprint.

Are There Risks or Downsides to Power Purchase Agreements?

PPAs are not without risk. Buyers and sellers should consider the following:

• Long-term commitment: Contracts often span 10 to 25 years. Exiting early can be costly or impossible.
• Price lock-in: If market energy prices drop significantly below the contract rate, the buyer may end up paying more than the going rate.
• Counterparty risk: If the seller faces financial trouble or the project underperforms, the buyer may not receive the expected electricity or financial benefits.
• Performance risk: Equipment faults, weather events, or poor maintenance can reduce output. Regular solar PV inspections help catch these issues early. If production falls short, the seller may face penalties or fail to meet delivery obligations.

Understanding these risks upfront helps both parties structure agreements that account for real-world variability.

How Does Asset Visibility Help Protect PPA Value?

A PPA’s value depends on consistent energy delivery. If a solar farm or wind installation underperforms, the seller risks missing contractual obligations. Penalties, lost revenue, and strained buyer relationships can follow.

This is where asset visibility becomes critical. Faults like hotspots, failed strings, or blade erosion reduce output quietly. Without regular inspections, these issues compound over time and erode the capacity factor that the PPA was built around.

Autonomous inspection and AI analytics give operators a continuously updated view of asset health. By combining inspection data, fault detection, and historical performance records, teams can spot problems before they affect delivery commitments. Regular blade or thermal inspections catch issues that are invisible from the ground, while automated analytics prioritize repairs by estimated power loss.

For renewable energy power purchase agreement holders, this visibility is not optional. It’s how you protect the long-term value of your contract and maintain buyer confidence.

FAQs

Who owns the solar panels in a PPA? 

The energy producer (seller) typically owns the panels. The buyer purchases the electricity, not the equipment.

What is the typical duration of a solar PPA? 

Most solar power purchase agreements range from 10 to 25 years, with 15 to 20 years being common for utility-scale projects.

What happens at the end of a PPA term? 

Options vary by contract. The buyer may renew at a renegotiated rate, purchase the system, or allow the seller to decommission or relocate the equipment.

Can a PPA help my company meet sustainability targets? 

Yes. A corporate power purchase agreement allows companies to claim renewable energy use and reduce reported Scope 2 emissions.

Are there risks or downsides to solar PPAs? 

Yes. Long-term price lock-in, counterparty risk, and performance variability are the main concerns. Proper due diligence and ongoing asset monitoring help mitigate these risks.