Distributed solar energy and the business model that emerged around it

Brazil has higher solar irradiation than Germany in practically its entire territory, and yet it took decades for solar energy to become relevant in the national electrical matrix. The irradiation has not changed. What changed was the business model. The drop in the cost of photovoltaic panels, the regulation of distributed microgeneration and the emergence of integrators, financing fintechs and shared energy platforms created a value chain that transformed solar energy from an expensive technology accessible to few into a financial product with a predictable return accessible to any company with an electricity bill above R$1,500 per month. Anyone who still treats solar as an engineering decision is missing the conversation that matters, which is financial.

What regulation made possible

The regulatory framework that made the distributed generation market in Brazil viable was ANEEL's Normative Resolution 482/2012, which created the energy compensation system — called net metering. The logic is simple: energy produced and not consumed at the time of generation is injected into the grid and becomes credit that can be used at another time. For residential consumers and companies with a consumption profile that does not coincide with peak solar generation hours (around noon), this system is what makes the installation financially viable.

Law 14,300/2022, the Legal Framework for Distributed Micro and Minigeneration, consolidated and expanded this framework, guaranteeing already connected installations a transition period for the new tariff rules. The new model provides for system usage tariffs (TUSD and TUST) on compensated energy, which reduces the net benefit compared to the previous model — but does not eliminate it. The 25-year warranty period for systems already connected until 2045 provides sufficient predictability for long-term financial planning.

The second relevant regulatory pillar is shared generation and generation consortia, which allow multiple consumers to share credits from a single plant — the solar farm model. This mechanism opened the market to consumers who do not have physical space for installation or who live in apartments.

The business models that emerged

The solar integrator — a company that designs, supplies and installs photovoltaic systems — is the oldest and still dominant model in volume. Brazil today has more than 10,000 companies registered as integrators, with a concentration in the states of the Southeast and South. Quality varies enormously, and the difference between a competent integrator and an incompetent one has consequences that last decades — poorly installed panels with inadequate shading or undersized inverters deliver 20% to 30% less energy than projected.

Shared generation plants, or solar farms for energy subscription, are the model that has grown the most in the last three years. The customer does not install anything — he signs a contract to receive energy credits from a remote plant, with a 10% to 25% discount on the electricity bill in exchange for a 3 to 5 year contract. For companies with rented properties or no available space, this model eliminates all physical barriers. For the plant developer, it is a predictable recurring revenue model that makes construction financing easier.

Leasing and Power Purchase Agreement (PPA) are variants where the customer does not purchase the equipment — a company installs the system on the customer's roof and sells the energy produced at a discount in relation to the distributor's tariff. The customer only pays for what they consume, with no initial investment. The installer monetizes the difference between production cost and sales price during the contract, typically 10 to 15 years. For SMEs that have capital constraints but consume enough energy to make the PPA viable, this model has democratized access to solar.

What energy fintechs saw before the traditional market

Financing the purchase of solar panels with conventional bank credit was bureaucratic and expensive, especially for individuals and small businesses. Solar energy fintechs — Solfácil, BV Solar, SolarZ — created credit products specifically designed for the cash flow of photovoltaic installations: a term compatible with the return on investment (5 to 7 years), a rate that makes the financing cost lower than the savings generated from the first month, and a simplified approval process with the electricity bill as the main analysis data.

This product — "you save more than you pay in installments from the first month" — turned solar into a sales product, not an engineering one. The integrator stopped selling technology and started selling a financial equation: the customer does not spend capital, does not pay more than he already paid and eliminates the risk of a fee increase in the financing horizon. Credit penetration in the solar market went from less than 20% of installations in 2019 to more than 60% in 2024.

What companies outside the energy sector need to understand

For a company with an energy bill between R$50,000 and R$500,000 per month — a typical range for industries, hospitals, supermarkets and medium-sized distribution centers — solar is no longer an environmental decision. It’s a financial decision with a measurable return. The cost of kWh generated by your own photovoltaic system is currently between R$0.15 and R$0.30 per kWh, depending on the size of the system and the capital cost. The residential and commercial tariff in the main Brazilian distributors is between R$0.80 and R$1.10 per kWh with all charges. The spread is wide.

The decision for companies with a roof or available area is to compare PPA versus buy-to-own versus solar farm subscription. The PPA eliminates the execution risk but has a lower return. Own purchase has an average payback of 4 to 6 years with a higher accumulated return over the 25 years of the system's useful life. A solar farm is the only option for those who don't have space.

What complicates the decision for companies operating in rented properties is the need to align with the owner — in commercial properties, the tenant can install with the landlord's authorization, and the system may or may not be transferred at the end of the contract depending on what is negotiated. This point is often ignored in the planning phase and is only discovered when the project has already been approved internally.

The opportunity for those who have idle space

A less obvious angle to the solar business model is the monetization of idle land. Logistics warehouses, parking lots and industrial rooftops with available area can be leased for solar power plant development with rental income paid by developers. The owner receives income without invested capital, the developer has the asset located close to consumers, and the energy credits can be used by the owning company or sold to third parties via a shared generation platform.