In April, we announced a private capital increase using the dividends declared by Equatorial for the fiscal year of 2023. This initiative aims to further reduce the company's leverage ratio. We were also able to take advantage of the good moment in the capital market to extend a portion of Equatorial Goiás' debt with a cost reduction and completed the issuance of Bahia's one debentures. We also improved the company's maturity profile with the early redemption of the fifth series of the fifth issue of debentures in January, which contributed to reducing the holding gross debt from BRL 4.1 billion in the fourth quarter of 2023 to BRL 2.1 billion in the first quarter of 2024. Finally, we would like to highlight the 32% reduction in investments, driven by the distribution segment.
Let's now move to Slide 8, where we bring an overview of the operational and commercial performance of our discos, in addition to the highlights of the quarter. On the left side, we briefly present the consolidated performance of our energy distributors, where we highlight the strong volumes of injected and distributed energy, the reduction in losses in the quarter. This being the second consecutive quarter below the regulatory level of losses in the consolidated results. This quarter, we had a collection of 96.6% and a PDA of 1.7%. The level of collection was impacted by the mathematical effect of volume growth, the reduction in collection actions due to the teams that were temporarily relocated to emergency services, and a reduction in collection from the public authorities in high voltage, with this last effect already fully recovered in April.
The increase in the provisions for doubtful provisions was influenced by revenue, in addition to the reversals that occurred in Goiás and Amapá in the first quarter of 2023. On the right side of the slide, we show the evolution of the gross margin in the distribution segment, which grew by 14%. The major highlight here is the addition of BRL 290 million from Equatorial Goiás. As a result of market growth, the increase of the distribution tariff, called Fio B, given the tariff review and the reduction in losses. PMSO, adjusted per consumer in the twelve months in the pro forma view, decreased by 2.5%, demonstrating the company's cost discipline and improved operational performance. These movements reflected an increase in adjusted EBITDA of 14.9%. Now, let's move on to Slide 9.
Here, we present our operating quality of our discos. There was an improvement in FEC across all discos. In DEC, there was an improvement in four of the seven distributors, and in two, the DEC was in line when compared to Q1 2023, reinforcing the commitment to operational quality in the group's concessions. The highlights of the quarter are the reductions of 10.5 hours and 6.6 hours in Amapá and in Maranhão, respectively, when compared to the same period of the previous year. In Rio Grande do Sul, the DEC was influenced by the cyclones observed in the months of January and March. Now, on Slide 11, we are going to look at the other segments of the group.
In transmission, without Intesa, we reported a regulatory EBITDA of BRL 284 million, a growth of 8.22% between quarters, with a margin of 94%, an EBITDA margin. It's worth recalling that we stopped consolidating Intesa's debt in December, and the results will no longer be consolidated from April onwards due to the sale of the asset on March twenty-first. Sanitation segment data still reflects the early stages of operation, and its performance continues to show volatility. In the renewable segment, we presented an EBITDA of BRL 114.6 million, a reduction of 23% between periods due to the reduction in generation, resulting from the reduction in the wind resources. Generation was 374 average megawatts and had a low curtailment impact in the quarter. Now, I turn the floor back to Augusto.
Thank you. So let's move on to Slide 12. We present an update on Echoenergia's pipeline. Ribeiro Gonçalves Solar Plant was energized on April 24 and is scheduled to enter commercial operation in May. Located in the municipality of Ribeiro Gonçalves, in the state of Piauí, it has more than 377 hectares, 460,000 solar panels, and installed capacity to generate up to 283 MWp of energy, enough to supply around 335,000 households. The energization of Ribeiro Gonçalves solar farm is an important step for Equatorial in its journey to diversify its portfolio in the renewable generation segment. Until the first quarter of 2024, BRL 967 million was invested in this project.
On Slide 14, we had a very good quarter from both financial and operational point of view, but we are aware of the importance of our role in continuing to deliver consistent and growing results to benefit all of our stakeholders. The situation in Rio Grande do Sul is challenging, but we are committed to helping the state to recover. We will work tirelessly to reconnect affected customers and find solutions that balance the economic and financial health of the concession, while maintaining reasonable tariffs. In this spirit of solidarity, we invite you all to contribute with donations to the state. For details on how to donate, please refer to Slide 15 of this presentation. We will continue to advance with the evolution of the turnaround in Goiás, focusing on strengthening the grid and improving operational quality.
In the group's other disco, we will continue advancing the quality of operations, in addition to improving the revenue cycle. We will take another step in the growth of the renewables portfolio with the completion of the construction of Barreiras I, bringing diversification to our generation portfolio and further cash generation. In the field of capital structure, we will continue to seek an improvement in leverage levels, both through financial performance and inorganic actions to assist in this process, allowing greater competitiveness in the assessment of possible future opportunities for capital allocation and value generation. Now, we'll hand over the floor to the operator to open the Q&A session. Thank you. Thank you. We will now open the Q&A session. If you wish to ask a question, please click on the Raise Hand button on the lower part of your screen.
To ask a question in writing, use the Q&A button. Please, while... Wait while we collect the questions. Our first question comes from Maria Carolina Carneiro with Safra. Your line is open. You may proceed, ma'am. Good afternoon, everyone. Can you hear me? Yes. I have two questions on my side, and thank you very much for the opportunity. First question is, I understand that it's difficult to estimate the impacts from what happened in Rio Grande do Sul and how it's gonna affect the concession, but if you could provide some light in terms of volume, revenue, and what we could expect in the line of CapEx, if you have any initial number. And also, considering that the situation continues to be very fragile, and considering that ANEEL provided some flexibilization, so...
Can we expect 100, 100% of the services to be recovered, both in terms of the physical aspect and as to the regulations in terms of invoicing, so customers will not be charged, we will not be able to send the invoices? So these are my questions in relation to Rio Grande do Sul. The second question is related to what we saw in terms of CP 62, ANEEL decision in relation to regulatory cost. Thank you. Carol, thank you for the questions. I would like to provide you with a context. Last year, we had 16 events in Rio Grande do Sul, and this event was a bit different from the other ones, where we did not have the wind, but we received a lot of water.
We have grids under water, so there are many clients with no electricity, and we disconnected for safety and security reasons. As we mentioned in the beginning, we are relocating some teams from other areas, from Piauí, Maranhão, and we are relocating them so that they can provide support to us, but we have to wait for the water to recede. We have three substations which are disconnected now, and we also have an underground system that is under water. So the underground system was designed to work underwater, but the others were not. We still have to wait in order to have the proper quantification and start to develop actions. We have already reduced the number of 114,000 clients, and we have seen fluctuations of 10% or 13% that were affected.
There was no wind, but the water needs to recede so that we can make a proper assessment, a clearer idea of the impact. So we estimate that numbers will be 40,000 households, but all the numbers we have are preliminary numbers. The focus is to reconnect with safety all the connections, and we want to be very close to the people, to the society, providing all the support we can possibly offer. Cristiana could make some comments about the regulation, annual regulation. Good afternoon, everyone. In fact, CP 62 came out last week. It's a technical note. And only on Friday, we got information about the database, so we are still evaluating the situation, but we understand that we will include consumers, urban and rural grids. I believe that decision was very positive.
In some aspects, ANEEL established its position, but the average, sectorial average was very interesting. There were two new elements that had not been present in discussion, and these are the points that are still being discussed with ANEEL. So we had one week of discussion together with ANEEL, and so that we can better evaluate the two points, the new points that it brought forward. One is a ceiling for the PMSO, and the other is the sharing with the consumers. So these are the two, two points that are being discussed with ANEEL, and we haven't made progress yet. Thank you. So there were some corrections, some adjustments, and there were also some points that had not been discussed properly yet, and they had not been put forward for public consultation.
So we are working so that we can perfect all those points. Okay, perfect. Thank you.
Our next question comes from Daniel Travitzky with Safra. Your line is open, sir.
Hello, just to add to the questions already made by Carol. Considering all the discussions that we have been having and the problems you have been facing, what about the regulatory agenda related to other topics, such as renewal of concessions? So how have you been discussing with ANEEL, considering that we have Rio Grande do Sul also in place? So how do you see the evolution of those? And I would also like to understand how what is the FEC and DEC quality limits. There has been a change in the demand by ANEEL, moving to electrical substations. So how do you see this new methodology of charging as a demand from ANEEL, and how are you getting ready to meet these new requirements by ANEEL? Thank you. Thank you, Daniel, for the question. It's very relevant.
I would say that the Rio Grande do Sul agenda has been still in the scene, considering how relevant the topic is. But the other topics are, such as the renovation topic, are topics that are quite mature, and they reached a level where the documents are about to be issued in order to get the validation. So of course, there is a delay because there was something much more important happening. But after this, we are going to continue with the operation as it is. As in relation to the regulations, there was an improvement of the products in relation to urban and rural grids, consumers. There was an improvement on those topics, but there were new items that were included, and they had not been discussed yet. And Abradee very wisely asked us to have a space for us to discuss those two topics.
So I understand that those items are likely to be improved as well. So the decision was very strategic, and I believe that ANEEL will listen to us and will understand the contributions that we can offer as to efficiency and innovation. We hadn't discussed it beforehand, but there are some adjustments that need to be made in terms of incentivized energy and... So it would be very interesting for those who are delivering the results above the demand by ANEEL, so that they can consider that the quality is more robust than needs to take into consideration. And this is a topic that is going to be put to discussion with ANEEL.... Excellent. Thank you. Our next question comes from Gustavo Faria with Bank of America. Your line is open, sir. Hey, pessoal. Hello. Thank you very much for the possibility of asking questions.
I have a question related to a CELG in Goiás, that asset, and in relation to the cost. We saw that the OpEx were basically flat year-on-year when we see the adjusted PMSO. But when we look at the previous quarter, we see some differences. You mentioned that there could be some volatility when the asset started operating, but I would like to understand why there was such an increase, and what could we consider as a recurring cost in the CELG, this asset? Thank you, Gustavo, for the question. In fact, we are very enthusiastic about Goiás's asset, which was an acquisition, transformational. The focus is on quality. I believe that is worth mentioning. Of course, everybody knows it, but the tariff review repositioned the DEC in comparison to the investment in a very interesting way.
We have been able to make the standard of CapEx; we made it more efficient. We are doing more with less, and basically, in one year we were; it classified within the regulatory limits. There was a renegotiation, initial renegotiation of the agreements and new standardization, and we managed to have important savings. But at the same time, some of the same things were redirected for the great emergency situations. And with some more time, we will be able to see the benefits associated with the investments made. So especially this year, especially in this first quarter, we managed to anticipate part of the strategy this year, and this brings some of the volatility. But for sure, this was a big focus for us. As you know, we have been meeting all the...
We've been meeting all the requirements in relation to assemblies, and Goiás will be included as of this year. So that was a very important focus and very thanks for the question. Now, complementing Gustavo. When we started this asset, when we look at the relevance of the EBITDA of this asset, we understand that this is a market that has been operating above the Brazilian level, market level. And we already estimated that in the beginning we would have a higher OpEx in order to meet this demand. So this is when the investments start to make effects. So we are accelerating this, and so that we can decelerate the OpEx later on. This is exactly what Daniel mentioned. Okay, thank you very much. Our next question comes in writing by Mr.
Daniel Almeida with Butiá Investimentos: "Could you make some comments on the sanitation operation? How have you been decreasing the losses and improving the efficiency of the concession?" Daniel, thank you for the question. We have been doing a making effort. In the beginning, we needed to make the necessary registrations and records, and it was a bit more a bit harder than we expected, but it's a greenfield operation. We are still in the beginning, and we have seen a lot of volatility until things start running with a more clear trend. So we continue searching for or generate an improvement in this asset. Once again, if you wish to ask a question, please click in on the Raise Hand on the lower part of your screen. For questions in writing, use the Q&A button.
Wait while we collect the questions. The Q&A session has come to an end. We'd like to turn the call over to the officers for their final remarks. In closing, we want to reiterate once again our commitment to our agenda of continued value generation for our investors, based on consistent delivery of results in the different segments in which we operate, always based on a disciplined financial management. I would also like to remind you that our investor relations team is available to support with any clarifications you may require after this call. Once again, thank you for your interest in the company and for taking part in our earnings call. Have a good afternoon, everyone. Equatorial Energia conference call has come to an end. We would like to thank you for participating, and have a nice day.