This has resulted in significant revenue growth and solid EBITDA performance. As previously announced, we have divested the shipyard Havyard Leirvik to Tersan, settled for NOK 30 million in net cash. We are also pleased to announce that the acquisition process of LOS Gruppen and Kvinnherad Elektro has progressed through the fourth quarter and into the first, with an expected closure primo second quarter. Further updates will be provided as we progress. We can report a solid order book at the end of fourth quarter, up 62% year-over-year. We have increased our contract scope with large customers such as Boliden, Hydro, and Aker Solutions. We have also secured new smaller contracts within processes, offshore and land-based industries. Decarbonization and efficient energy use continues to be important for us. We have witnessed significant demand both on existing projects and in dialogue with key customers. With this, I give the word to Petter.
Thank you, Erik. Here is an overview of our key financial figures for the segment for the full year 2023. The revenues for the full year ended at NOK 687 million. The group adjusted EBITDA was about NOK 42 million. The product, solution, and renewable segment delivered a solid year and reported an adjusted EBITDA margin of 8.6%. The solid year for the segment was partly offset by a negative impact from customer and subcontractor insolvency, resulting in a NOK 30 million negative impact on EBITDA. This, together with a one-off management fee to BKS of NOK 8 million, have been booked as non-recurring costs in the quarter. Product, solution, and renewables experienced strong growth throughout 2023, with an impressive organic EBITDA increase of 109% compared to the previous year. The growth has primarily been driven by high project activity in BKS.
The order book gives good visibility into the upcoming year, and we expect BKS to sustain its high activity level going forward. When it comes to Fossberg Kraft, the construction of the Høgset Power Plant is progressing according to plan, but there have been some delays in the construction of the Skjeggefoss Power Plant due to a subcontractor insolvency. We have included this slide in our portfolio company, BKS, to illustrate the significant growth we have experienced. In 2023, the sales increased 60%, and our adjusted EBITDA margin was 8.1%. This is a result of the company's continuously strong client relationship and our dedicated staff's hard work. Eqva's financial position remains solid, with an equity ratio of 40% at year-end. Our net interest-bearing debt was NOK 158 million, with a cash balance of NOK 28 million.
Due to strong operational growth, we have strengthened the working capital by increasing the overdraft facility in BKS. In Fossberg Kraft, the construction loans were increased according to plans. These loans will be repaid when projects are delivered to customers. The total order book of the year-end was NOK 487 million, up from NOK 300 million in 2022. The majority of the order book comes from BKS. This gives us confidence in our positive outlook for the upcoming year and a strong foundation for further growth. Back to you, Erik.
Thank you, Petter. Let's take a look on our guidance going forward. Our outlook for the group indicates a full-year revenue between NOK 600 million-NOK 700 million, based on our pro forma figures, and an EBITDA between 5%-7%. With planned EBITDA activities included, revenues are expected to increase to NOK 1.2 billion-NOK 1.4 billion on a full-year basis, with the same EBITDA range. Eqva's overall strategic priorities remain. We will grow by having a diversified revenue stream and investing along key macro trends. We will also continue to create value through a combination of M&A and organic growth. These slides show an overview of our current assets. We have a 100% stake in BKS, Fossberg Kraft, and our real estate portfolio. In addition, we have decided to initiate a sales process over ownership in Havila Kystruten.
We are enthusiastic about the outlook for 2024 as we see strong potential in value-creating M&A opportunities for Eqva. We have included an expanded appendix in this presentation for further information. If you have any questions about Eqva, please don't hesitate to make contact with us. Thank you all.