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Energy Insights

Onsite PPA: Efficient Renewable Energy Solutions

onsite PPA solar panels on a business rooftop

An onsite PPA (Power Purchase Agreement) involves a business hosting a renewable energy system, such as solar panels, on its property. The business purchases the generated electricity at a fixed rate, reducing energy costs and promoting sustainability.

Key takeaways

  • Onsite PPAs enable businesses to generate renewable energy on their premises, reducing energy costs and carbon footprint without significant upfront investment.
  • Cost Reduction: Businesses can lower their energy bills and achieve long-term savings with fixed energy rates and potential tax incentives.
  • Environmental Impact: Onsite PPAs help businesses reduce their reliance on fossil fuels and contribute to sustainability goals, enhancing their corporate image.
  • Energy Independence: Generating energy on-site provides stability against fluctuating energy prices and supply disruptions.
  • Types of Systems: Solar power is the most common, but wind power and biomass systems are also viable options depending on location and available resources.
  • Case Study: A Melbourne manufacturing company reduced energy bills by 30% and carbon emissions by 40% with an Onsite PPA, boosting both financial performance and environmental responsibility.

Estimated Reading Time: 7 minutes


Leverage onsite PPAs to directly harness renewable energy, reducing costs and carbon footprint for your business.

In today’s world, businesses are increasingly looking for ways to reduce their carbon footprint and cut energy costs. One of the most effective strategies is leveraging Onsite Power Purchase Agreements (PPAs). These agreements enable businesses to generate their own renewable energy directly on-site, tapping into sources like solar or wind power. This not only provides a sustainable and cost-effective energy solution but also ensures a steady supply of clean energy, insulated from market volatility. With Onsite PPAs, companies can significantly lower their energy bills, reduce greenhouse gas emissions, and enhance their corporate image as environmentally responsible entities.

Additionally, the structure of these agreements typically means that the energy provider handles the installation and maintenance, allowing businesses to reap the benefits without the burden of substantial upfront investments or technical complexities. This approach not only aligns with global sustainability goals but also positions companies as leaders in the transition to a green economy, making Onsite PPAs an attractive option for businesses aiming to achieve both financial and environmental objectives.

What is an Onsite PPA?

An Onsite Power Purchase Agreement (PPA) is a contract between a business and an energy provider. Under this agreement, the energy provider installs, operates, and maintains a renewable energy system on the business’s premises. The energy generated by this system is then purchased by the business at a predetermined rate. This arrangement offers several advantages:

No Significant Upfront Investment: One of the biggest benefits of an Onsite PPA is that businesses do not need to make a large initial investment. The energy provider typically covers the cost of the renewable energy system, including installation and maintenance.

Stable Energy Costs: Businesses can lock in energy costs at a fixed rate, protecting them from future energy price fluctuations. This stability is particularly advantageous in markets with volatile energy prices.

Renewable Energy Supply: Onsite PPAs ensure a steady supply of renewable energy, which can be used to power a company’s operations. This reduces reliance on traditional, fossil-fuel-based energy sources and aligns with sustainability goals.

By entering into an Onsite PPA, businesses can enjoy the benefits of renewable energy without the financial and operational burdens typically associated with owning and managing energy systems.

Benefits of Onsite PPAs

Cost Reduction

One of the primary benefits of an Onsite PPA is cost savings. By generating renewable energy on-site, businesses can significantly reduce their energy bills. This is especially beneficial in Australia, where energy costs are relatively high. Here’s a detailed look at the cost-related benefits:

Lower Energy Bills: Onsite PPAs allow businesses to generate their own electricity, reducing the amount of energy they need to purchase from the grid. This results in lower monthly energy bills.

Fixed Energy Rates: The cost of energy generated through an Onsite PPA is typically fixed for the duration of the agreement. This protects businesses from market volatility and helps in budgeting and forecasting.

Tax Incentives: Businesses may be eligible for government incentives and tax breaks for using renewable energy. These financial incentives can further reduce the overall cost of energy.

Long-Term Savings: Over the lifespan of the renewable energy system, businesses can achieve significant cumulative savings. The reduced energy bills and fixed rates can lead to substantial financial benefits over time.

Here’s an overview of the potential savings:

Lower Energy BillsSignificant reduction in monthly energy costs.
Fixed Energy RatesLock in energy prices to avoid market volatility.
Tax IncentivesPotential eligibility for government incentives and tax breaks.
Long-Term SavingsCumulative savings over the lifespan of the renewable energy system.

Environmental Impact

Reducing your carbon footprint is another significant advantage of Onsite PPAs. By harnessing clean energy, businesses can lower their reliance on fossil fuels and contribute to a healthier environment. Here are some key points:

Clean Energy Generation: Renewable energy systems, such as solar panels or wind turbines, generate electricity without emitting greenhouse gases. This helps in reducing the overall carbon footprint of the business.

Sustainability Goals: Adopting renewable energy solutions aligns with global sustainability goals. Businesses can demonstrate their commitment to environmental stewardship and corporate social responsibility.

Positive Brand Image: Companies that invest in renewable energy can enhance their reputation as environmentally conscious organisations. This can attract customers, investors, and partners who value sustainability.

Energy Independence

Onsite PPAs provide a level of energy independence, protecting businesses from fluctuating energy prices and supply disruptions. This stability is crucial for long-term planning and budgeting. Here’s how Onsite PPAs contribute to energy independence:

Reduced Dependency: By generating energy on-site, businesses reduce their reliance on external energy providers. This ensures a more stable and predictable energy supply.

Protection from Supply Disruptions: Onsite renewable energy systems can continue to generate power even during disruptions to the grid. This enhances the resilience of business operations.

Operational Stability: With a stable and predictable energy supply, businesses can better manage their operations and avoid the risks associated with energy price spikes and shortages.

How Onsite PPAs Work

The process of setting up an Onsite PPA involves several steps, each crucial for ensuring the success and efficiency of the renewable energy system.


The first step is the assessment phase, where the energy provider evaluates the site to determine its suitability for renewable energy systems. This assessment involves several key activities:

Site Inspection: The energy provider conducts a thorough inspection of the business premises to identify the best locations for installing renewable energy systems. This includes evaluating roof space, ground area, and any other potential installation sites.

Energy Needs Analysis: The provider assesses the energy consumption patterns of the business to determine the size and type of renewable energy system required. This analysis helps in designing a system that meets the specific energy needs of the business.

Local Climate Conditions: The provider considers local climate conditions, such as sunlight availability for solar panels or wind patterns for wind turbines. This ensures that the renewable energy system is optimised for maximum efficiency.


Once the assessment is complete, the next step is to formalise the arrangement through a PPA. This agreement outlines the terms and conditions of the energy generation and purchase:

Pricing Structure: The PPA specifies the rate at which the business will purchase the generated energy. This rate is usually fixed for the duration of the agreement.

Duration of Agreement: The PPA includes details on the length of the contract, which can range from 10 to 25 years, depending on the terms negotiated.

Responsibilities: The agreement clearly defines the responsibilities of both parties. The energy provider is responsible for the installation, operation, and maintenance of the renewable energy system, while the business agrees to purchase the generated energy.


The installation phase involves the setup of the renewable energy system on the business premises. This phase includes several critical steps:

Design: Based on the assessment, the energy provider designs a customised renewable energy system that meets the business’s energy needs. This includes selecting the appropriate technology, such as solar panels or wind turbines.

Procurement: The provider sources the necessary components and equipment for the installation. This includes solar panels, inverters, mounting systems, and other essential hardware.

Installation: The renewable energy system is installed on the business premises. This involves mounting the solar panels or wind turbines, connecting them to the electrical system, and ensuring all components are securely in place.

Operation and Maintenance

After the installation, the energy provider takes on the responsibility of operating and maintaining the renewable energy system to ensure its optimal performance:

System Operation: The provider continuously monitors the performance of the renewable energy system, ensuring it operates efficiently and generates the expected amount of energy.

Regular Maintenance: Routine maintenance is conducted to keep the system in good working condition. This includes cleaning solar panels, inspecting components, and making any necessary repairs.

Performance Monitoring: Advanced monitoring systems are used to track the system’s performance in real-time. This helps in identifying any issues promptly and ensuring the system operates at peak efficiency.

Energy Purchase

The final step is the energy purchase phase, where the business buys the generated energy at the agreed rate. This energy is used to power the business's operations, reducing reliance on the grid and contributing to significant cost savings. The energy purchase process includes:

Billing: The business receives regular invoices for the energy consumed, based on the agreed rate in the PPA. This transparent billing process helps in budgeting and financial planning.

Energy Usage: The renewable energy generated on-site is used to meet the business's energy needs, reducing the amount of energy purchased from external providers.

Savings Realisation: Over time, the business realises the financial benefits of the Onsite PPA, with reduced energy bills and fixed energy costs contributing to long-term savings.

By following these steps, businesses can successfully implement an Onsite PPA and enjoy the numerous benefits of renewable energy. This comprehensive approach ensures that the renewable energy system is tailored to the specific needs of the business and operates efficiently throughout its lifespan.

Types of Renewable Energy Systems

Solar Power

Solar panels are the most common renewable energy system used in Onsite PPAs due to their efficiency, reliability, and suitability for various business premises. Solar power systems harness energy from the sun and convert it into electricity using photovoltaic (PV) cells. These systems are highly efficient and can generate a substantial amount of energy, even on cloudy days. The versatility of solar power systems allows them to be installed in multiple locations such as rooftops, car parks, or ground-mounted areas, making them an ideal solution for a wide range of businesses.

Rooftop installations are particularly popular as they utilise unused space and do not interfere with the business's operations. Car park installations can provide dual benefits, offering shaded parking for vehicles while generating electricity. Ground-mounted systems are suitable for businesses with large, open areas and can be scaled up to meet significant energy needs.

Solar panels require minimal maintenance, typically only needing periodic cleaning and inspections to ensure they are functioning optimally. The durability and longevity of modern solar panels mean they can continue to generate electricity for 25 years or more, providing a long-term, sustainable energy solution.

Wind Power

Wind turbines are another effective renewable energy option, particularly suitable for businesses located in areas with strong and consistent wind patterns. Wind power systems generate electricity by capturing the kinetic energy of the wind through large blades attached to a rotor. As the wind blows, it turns the blades, which spin a generator to produce electricity.

Wind turbines can generate significant amounts of energy, often producing more electricity than solar panels under the right conditions. However, they require more space and maintenance than solar panels, making them ideal for businesses with large, open spaces such as farms, industrial sites, or rural areas.

Installing wind turbines involves a more complex process than solar panels, including site assessments to determine wind speeds and patterns, as well as considerations for zoning and permitting. Despite these challenges, wind power can be a highly efficient and cost-effective renewable energy solution for businesses in suitable locations.


Biomass systems convert organic materials into energy through processes such as combustion, anaerobic digestion, or gasification. While less common than solar or wind power, biomass energy systems can be a viable option for businesses with access to organic waste materials, such as those in the agriculture, forestry, or food processing industries.

Biomass energy systems can utilise a wide range of feedstocks, including agricultural residues, wood chips, animal manure, and food waste. These materials are converted into heat, electricity, or biofuels, providing a valuable way to recycle waste products and reduce environmental impact.

One of the key benefits of biomass systems is their ability to generate continuous, base-load power, unlike solar and wind systems, which are dependent on weather conditions. This makes biomass an attractive option for businesses with consistent energy demands. However, biomass systems do require more intensive management and maintenance compared to other renewable energy technologies, including regular feedstock supply and handling.

Financial Considerations

Upfront Costs

One of the most attractive features of Onsite PPAs is the lack of significant upfront costs. Typically, the energy provider covers the cost of the renewable energy system installation and maintenance. This arrangement allows businesses to benefit from renewable energy without the financial burden of high initial expenses. The provider takes on the responsibility of funding the project, designing the system, procuring the necessary equipment, and overseeing the installation process.

This financial model is particularly advantageous for businesses that may not have the capital to invest in renewable energy systems outright. By entering into an Onsite PPA, companies can start reaping the benefits of renewable energy immediately without the need for significant capital expenditure. Additionally, the energy provider often assumes the risk associated with system performance and maintenance, further reducing the financial burden on the business.

Long-Term Savings

Although there are no significant upfront costs, businesses should consider the substantial long-term savings offered by Onsite PPAs. Over time, the reduced energy bills can offset the cost of the energy purchase, leading to significant financial benefits. By locking in energy rates through an Onsite PPA, businesses can achieve predictability in their energy costs, shielding themselves from the volatility of traditional energy markets.

The long-term savings are particularly pronounced when considering the lifespan of renewable energy systems. Solar panels, for example, can generate electricity for 25 years or more, providing decades of reduced energy bills. Wind turbines and biomass systems also offer extended operational lifespans, ensuring ongoing financial savings.

In addition to direct energy cost savings, businesses may also benefit from various government incentives and tax breaks designed to encourage the adoption of renewable energy. These incentives can further enhance the financial attractiveness of Onsite PPAs, making them a sound investment for businesses looking to reduce operational costs and improve their bottom line.

Case Study: Success Story

Consider a mid-sized manufacturing company in Melbourne that implemented an Onsite PPA with a solar power provider. By installing solar panels on their roof, the company managed to reduce their energy bills by 30% and cut their carbon emissions by 40%. This transformation not only improved their bottom line but also enhanced their reputation as an environmentally responsible company.

Before adopting the Onsite PPA, the company faced high and unpredictable energy costs, which affected their profitability and operational planning. By partnering with a solar energy provider, they were able to lock in a fixed energy rate, providing financial predictability and stability. The installation of the solar panels was completed without any significant upfront investment, as the energy provider covered all associated costs.

Post-installation, the company experienced immediate financial benefits through lower energy bills. The predictable cost structure allowed for better financial planning and allocation of resources. Additionally, the reduction in carbon emissions aligned with the company’s sustainability goals, boosting their corporate social responsibility profile.

The positive outcomes extended beyond financial savings. The company received favourable attention from stakeholders, including customers, investors, and partners, who valued their commitment to sustainability. This enhanced reputation helped the company differentiate itself in a competitive market, attracting new business opportunities and fostering long-term growth.


Onsite PPAs offer a practical and financially sound solution for businesses looking to reduce energy costs and environmental impact. By generating renewable energy on-site, companies can achieve greater energy independence and enjoy long-term financial savings. The benefits of Onsite PPAs extend beyond cost savings, encompassing environmental sustainability and enhanced corporate reputation. If you’re ready to explore how an Onsite PPA can benefit your business, visit Energy Action to learn more. This proactive step can position your business as a leader in sustainability while securing financial and operational advantages.


  1. What is an Onsite PPA? An Onsite PPA is an agreement to generate renewable energy on your business premises and purchase it at a predetermined rate.
  2. What are the benefits of an Onsite PPA? Benefits include cost savings, reduced carbon footprint, and energy independence.
  3. What types of renewable energy systems are used in Onsite PPAs? Common systems include solar panels, wind turbines, and biomass systems.
  4. Are there any upfront costs for Onsite PPAs? Typically, there are no significant upfront costs as the energy provider covers the installation and maintenance costs.
  5. How can my business get started with an Onsite PPA? Visit Energy Action to learn more and get started with an Onsite PPA.

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