Centralized solar energy contracts face penalties, while discounts in the SE/CO reach R$200/MWh, benefiting other sources.
The recent dynamics of Brazil’s electricity sector have imposed significant challenges for centralized solar energy generation, particularly from 2025 onwards. Contract modulation, a strategy adopted to balance energy supply and demand, has been generating penalties for large-scale solar projects. This situation intensified, reaching a critical point in March of this year when the discount in the Southeastern/Central-Western (SE/CO) submarket approached R$200 per Megawatt-hour (MWh).
Conversely, this same modulation has boosted the remuneration of other generating sources, such as hydroelectric power plants (HPPs), which are compensated for the flexibility they offer the system. This disparity in treatment raises important debates about the sustainability and competitiveness of different energy matrices in the transition to a low-carbon economy in Brazil.
Impact of Modulation on Solar Contracts
Contract modulation, in essence, adjusts the amount of energy that power plants must deliver according to market variations. For centralized solar energy, which has a predictable generation profile during the day but lacks the same dispatch flexibility as other sources, this practice translates into financial losses.
Discounts applied when supply exceeds demand, or during periods of low system need, directly penalize solar generators whose fixed costs remain. The SE/CO submarket, one of the country’s largest energy consumers, has experienced these discounts sharply.
The R$200/MWh mark in losses for centralized solar energy demonstrates the magnitude of the financial impact, which can compromise the viability of new projects and the operation of existing ones, discouraging investments in large-scale solar photovoltaic energy.
HPPs Benefit from Flexibility
On the other hand, HPPs directly benefit from this scenario. Their ability to store water and control generation flow gives them valuable flexibility for the National Interconnected System (SIN).
Contract modulation, in this case, recognizes and remunerates this adaptive capacity to system needs, ensuring that energy is available when most needed and withdrawn when there is excess.
This remuneration for the flexibility of HPPs, although crucial for the stability of the electricity system, contrasts with the penalties imposed on centralized solar. The discussion then shifts to how to create a regulatory environment that incentivizes flexibility and does not penalize renewable sources with different generation profiles, which are fundamental for the energy transition.
Future Outlook for Solar Energy
The current scenario demands in-depth reflection on market mechanisms and Brazilian energy policy. It is essential to find a balance that allows for the sustainable expansion of distributed and centralized solar generation, without excessive penalties compromising its development.
Contract modulation, if unadjusted, could curb the advancement of solar energy in Brazil, delaying decarbonization goals. Solutions are being sought that consider the characteristics of each source and promote a fairer and more predictable business environment.
The continuation of high discounts could lead to a strategic re-evaluation of investments in renewable energy in the country, impacting the diversification of the energy matrix and Brazil’s long-term sustainability objectives.
