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History of Swedish Stirling

Swedish Stirling AB (at that time Ripasso Energy AB) was founded in 2008 by Gunnar Larsson, the former CEO of Kockums AB. His years at Kockums gave him deep insight into Stirling technology. Over the years, the company had successfully developed this technology for its submarines, producing an engine that was unique in terms of its ability to convert thermal energy into electricity at high capacity and with great efficiency. Swedish Stirling’s journey started with Gunnar’s idea that it ought to be possible to harness these characteristics in commercial applications for the generation of renewable energy. Initially, the company focused on the solar energy application. The company is currently focused on the proprietary PWR BLOK 400-F, whose Stirling technology recovers energy from industrial residual gases and converts these into electricity. The company’s vision is to establish Stirling technology as the best alternative for local electricity generation.

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    Commercial rollout in South Africa begins

    Signs agreement with Glencore Operations South Africa Proprietary Limited regarding an energy conversion service agreement for the installation of up to 25 PWR BLOK 400-Fs (9.9 MW) at the smelter Lydenburg, South Africa. Signs MOU and LOI’s with Samancor Chrome, Richards Bay Alloys och Glencore of new order of up to 241 PWR BLOK’s in South Africa.

  • First PWR BLOK to South Africa

    The company’s first commercial PWR BLOK unit is shipped to Afarak Mogale in South Africa and put into operation in May. The company changes its name from Ripasso Energy to Swedish Stirling. Signs an exclusive agreement with Glencore to finalise an installation of up to 25 PWR BLOK 400-F units. Signs letter of intent with the South African development bank IDC to form a jointly-owned financing/leasing company – Southern Shield. Signs an agreement with South African Samancor Chrome’s subsidiary TC Smelter for a pilot installation.

  • Opens office in South Africa

    The company opens an office in South Africa. Starts production of the first PWR BLOK units in Sibbhult. Signs a letter of intent with the South African ferrochrome producer Glencore regarding installation at their facilities in South Africa. Files a patent application concerning a system for central monitoring and control of the working gas in each Stirling engine within a PWR BLOK.

  • Launches PWR BLOK

    Submits three patent applications for the company’s hybridisation solution. Conducts tests with residual gas from the ferrochrome industry. Horizon orders three solar hybrid Stirling engines from Ripasso Energy (Swedish Stirling) for delivery to a pilot commercial facility in Sicily. Launches the PWR BLOK 400-F, a container-based solution for the extraction of energy from residual and flare gases. The South African company Afarak Mogale (Pty) Ltd orders seven PWR BLOK units.

  • IPO on NGM Nordic

    Enters into a framework agreement with the Italian company Horizon. The agreement is for 100 or so engines for commercial use in Sicily, along with a demonstration unit at the University of Palermo. After an oversubscribed new share issue, Ripasso Energy (Swedish Stirling) is listed on the NGM Nordic SME under the ticker RISE MTF (STRLNG).

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    First test with residual gases

    At the reference facility in Upington, South Africa, a net efficiency of 32% is recorded. No competing technology has ever demonstrated a conversion rate from solar to electricity of grid quality that high, so with that, Ripasso Energy can claim the unofficial world-record. In January 2015, an independent test will be carried out by IT Power, which will show that the efficiency of the Ripasso Stirling engine is in fact 33 %.

  • Relocates to Gothenburg

    Ripasso Energy (Swedish Stirling) relocates its headquarters from Malmö to Gothenburg.

  • The hybridization project begins

    Initial studies on a hybridised product are carried out, showing good results in terms of combining solar heat with other fuel-based methods for heating the Stirling engine.

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    Sets world record

    Net efficiency of 32 per cent is measured at the reference facility in South Africa. No other technology has previously (or after) demonstrated such efficiency at converting solar energy into grid-quality electricity.

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    Tests in Turkey

    The second-generation Stirling engine with a rated output power of 29 kW is tested in Antalya, Turkey.

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    First engine produced in-house

    Successful test of Ripasso Energy’s (Swedish Stirling’s) first Stirling engines produced in-house. Conclusion of agreement to test a solar power facility in Antalya, Turkey, and to construct a reference facility in Upington, South Africa.

  • Agreement with Sibbhultsverken

    Agreement signed with Metallbearbetning i Sibbhult for the production of Stirling engines.

  • The company is founded

    The company is formed, and an agreement is signed between Ripasso Energy AB(Swedish Stirling) and Kockums AB.