Solar Open Access vs Rooftop Solar: Which Is Better for Your Business?

Introduction

For businesses looking to reduce electricity costs and increase renewable energy use, solar open access and rooftop solar are two practical options. 

But which one is better for your business?  

Rooftop solar can be suitable for businesses with sufficient roof space and strong daytime electricity consumption. Solar open access may be suitable for businesses with high electricity demand, limited rooftop space, or a need for larger renewable energy capacity. 

In this article, we have briefly compared solar open access vs rooftop solar on key factors such as investment, space, savings, and scalability.  This comparison can help businesses understand which solar solution may be more suitable for their needs. 

What Is Solar Open Access?

Solar open access allows eligible businesses to procure renewable electricity from a power generator through the electricity grid, subject to applicable regulations, contracts and charges. 

The electricity is supplied through the existing power grid under applicable open-access regulations and commercial arrangements. This model can be useful for businesses with high electricity consumption or limited space for installing a large solar system at their facility.

Depending on the arrangement, a business may enter into a power purchase agreement or another suitable procurement structure. Since regulations, charges, and eligibility requirements can vary between states, businesses should evaluate the applicable rules before making a decision.

Also Read: Solar Open Access in India: Complete Guide for Businesses 

What Is Rooftop Solar?

A commercial solar rooftop system is a solar power system installed on the roof of a business, office, warehouse, or industrial building. It uses sunlight to generate electricity that can be used to run the company’s day-to-day operations. 

The generated power can be used directly by the facility, reducing the amount of electricity it needs to purchase from the grid.

A rooftop system can be suitable for businesses that have:

• Adequate usable roof space
• Good sunlight exposure
• Suitable structural conditions
• Consistent daytime electricity consumption

A professional site assessment is important before beginning solar installation.

Factors such as roof strength, shading, equipment placement, and available area can affect the size and performance of the system.

Key Differences: Solar Open Access vs Rooftop Solar

The table below highlights the major differences between solar open access and rooftop solar across key factors such as location, space, scalability, investment, and maintenance. 

Factor	Solar Open Access	Rooftop Solar
Location	Off-site	On-site
Rooftop space	Not required	Required
Scalability	Generally higher	Limited by available space
Installation at premises	Minimal	Required
Investment Model	PPA or other structures may be available	CAPEX, financing or other models
Maintenance at facility	Usually limited	Required
Best suited for	High energy demand and limited space	Facilities with suitable roofs

Cost and Savings

Cost is an important consideration when comparing both options.

With rooftop solar, the business typically needs to account for solar panels, inverters, mounting structures, electrical components, installation, and ongoing maintenance.

However, the system can generate electricity for many years, potentially providing substantial long-term savings.

Solar open access can reduce the need for a business to develop a large solar plant at its own facility.

However, the overall economics depend on more than the solar generation tariff.

Transmission, wheeling, banking, cross-subsidy, and other applicable charges can influence the final delivered electricity cost.

Therefore, businesses should compare the total cost of delivered power instead of considering only the initial solar tariff or installation cost.

Space and Scalability

Available space is one of the biggest differences between the two options.

Rooftop solar depends on the amount of usable roof area. HVAC units, water tanks, skylights, shading, structural limitations, and access pathways can reduce the area available for panels.

Consequently, businesses with high electricity requirements may not be able to install enough capacity on their roofs.

Solar open access removes this physical limitation because the solar generating project can be located off-site. 

This can make it attractive for large industrial facilities, warehouses, and commercial operations that need more renewable power than their premises can accommodate.

Installation and Maintenance

Rooftop solar requires detailed planning and on-site execution.

The process generally includes site assessment, system design, equipment selection, installation, testing, commissioning, and ongoing maintenance.

Businesses should carefully evaluate solar installation companies before selecting a project partner.

Experience with commercial and industrial projects, engineering capabilities, equipment quality, safety standards, warranties, and after-sales support are important considerations.

Open access reduces the need for major solar infrastructure at the consumer’s premises.

However, businesses still need to assess contractual arrangements, grid connectivity, regulatory requirements, and applicable charges.

Also Read: Why Choosing the Right Industrial Solar Company Matters 

Solar Installation in India: What Businesses Should Consider

The suitability of each model can vary across locations.

Businesses evaluating solar installation in India should consider electricity tariffs, consumption patterns, available roof space, solar potential, financing options, grid conditions, and applicable state regulations.

For open-access projects, state-specific policies and charges can significantly affect project economics.

A solution that works well for one business may not necessarily provide the same benefits for another.

A detailed feasibility assessment can help businesses compare expected savings and operational requirements before making a long-term commitment.

Which Option Is Better for a Business?

Neither rooftop solar nor solar open access is universally better.

The right choice depends on a business’s electricity consumption, available space, financial objectives, and long-term energy strategy. 

Rooftop Solar is suitable when:

• The facility has sufficient roof space.
• Electricity consumption is high during daylight hours.
• The business wants on-site power generation.
• The roof is structurally suitable.
• Long-term ownership of the system is preferred.

Solar Open Access is suitable when:

• Electricity demand is substantial.
• Available rooftop space is limited.
• The business needs a larger renewable energy supply.
• Off-site generation offers better economics.
• The business prefers a suitable PPA or procurement arrangement.

A Hybrid Approach

Businesses do not always have to choose only one option. A business may use rooftop solar for part of its electricity requirement and source additional renewable power through open access.

This approach can help businesses make better use of available roof space while accessing additional renewable energy capacity.

Businesses may also consider battery energy storage alongside rooftop or open-access solar where energy storage, peak-demand management, or backup support is required. 

Also Read: Battery Energy Storage System: Why Businesses Need It 

Conclusion

The decision between solar open access and rooftop solar should be based on a business’s energy consumption, available space, financial objectives, regulatory environment, and future growth plans.

Rooftop solar can work well for businesses with suitable premises and strong daytime consumption. Open access can provide greater flexibility for businesses requiring larger amounts of renewable electricity. 

Are you planning to choose between rooftop solar and open access for your business? 

Get in touch with Alligator Solar for a professional assessment of your energy requirements and explore the solar solution that fits your business needs.  

Frequently Asked Questions