Applying for financial aid for renewable energy-based technical installations (Klimabonus RGD 2022)

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The Environment Agency (Administration de l'Environnement - AEV) grants subsidies for investments in projects aimed at rationalising the use of energy and promoting the use of renewable energy sources.

This is financial aid – technical installation subsidies known as 'Klimabonus' subsidies – to subsidise the investment and installation costs of the following:

  • solar thermal systems;
  • solar photovoltaic systems;
  • heat pumps, hybrid heat pumps, or hybrid systems with a heat pump;
  • wood-fuelled boilers and particulate filters;
  • the implementation of a heating network and/or connection to a heating network.

These subsidies:

  • apply to:
    • renovation projects;
    • new constructions; and
  • may also be applied for independently of such projects.

For each type of system, potential applicants should contact the communal administration for the area where the building is located to ascertain whether a building permit is required or not.

Klimabonus aid is paid only once per technical installation.

On 5 June 2024, the Government Council adopted guidelines for the continuation and reform of the 'Klimabonus Wunnen' financial aid scheme to promote sustainability, the rational use of energy and the use of renewable energies in the housing sector. Subject to finalisation of the legislative and regulatory procedures, the 'Klimabonus Wunnen' scheme currently in force, along with the additional bonuses introduced after the Tripartite negotiations at the end of 2022, will be extended as follows:

  • heat pumps and wood-fuelled boilers: the 50 % bonus in the case of the replacement of an existing fossil fuel boiler or an existing electrical heating system will be maintained.
    The 'replacement bonus' will be maintained at 50 % for any order date on or after 1 November 2022 when an existing fossil fuel boiler or an existing electrical heating system is replaced by a heat pump, hybrid heat pump or wood-fuelled boiler;
  • photovoltaic systems: adaptation of financial aid for installations operated in self-consumption mode.
    The 25 % supplement on the financial aid granted for solar photovoltaic systems operated in self-consumption mode or as part of an energy community has been extended for a transitional period of 3 months (photovoltaic systems ordered by 30 September 2024 at the latest), maintaining the level of aid at 62.5 % of the actual costs, with a ceiling of EUR 1,562.50 per kWpeak. As of 1 October 2024, financial aid for photovoltaic systems will be reduced to 50 % of the actual costs for systems ordered on or after 1 October 2024, with a ceiling of EUR 1,250 per kWpeak.

The invoice for the technical installations must be drawn up by 31 December 2025 inclusive. With the exception of photovoltaic systems, this deadline is extended to 31 December 2029 inclusive, provided that the investments and services in question are carried out in conjunction with the energy efficiency enhancement of an existing building.

Who is concerned?

Financial aid may be sought by any person wishing to improve the energy performance of their home (single-family house or house divided into flats). Eligible candidates include:

  • natural persons;
  • legal persons established under private law;
  • public legal persons other than the State.

You can submit your application in your capacity as:

  • legal representative of a group of natural or legal persons, provided that you are a part of this group yourself;
  • owner(s) of the dwelling, except when there is a change of ownership and the new owner of the dwelling and/or technical installation forgoes the aid in question for the benefit of the former owner who made the investments.

Prerequisites

Installations and residences

The Klimabonus aid:

  • is granted only for residential buildings located in Luxembourg;
  • is not granted for:
    • used (second-hand) systems; or
    • an exchange, replacement or repair of a part of a system that cannot function independently of the rest of the system.

Technical installations for which financial aid was granted under the 2012 or 2017 financial aid scheme are not eligible.

Requirements

Hydraulic balancing

The heating network must undergo hydraulic balancing upon the installation of:

  • heat pumps;
  • solar thermal systems with complementary heating in a new single-family house or new multi-unit building.

Solar thermal systems

Solar thermal systems must meet the following requirements:

  • solar thermal collectors must be certified by the European Solar Keymark quality mark;
  • the installation must be equipped with a calorimeter;
  • the gross surface area of the collectors with complementary heating must be:
    • greater than or equal to 9 m2 for flat-plane collectors;
    • greater than or equal to 7 m2 for vacuum tube collectors;

Non-glass thermal collectors with polyethylene pipes and hybrid solar collectors generating hot water and electricity are not eligible for the financial aid.

Solar photovoltaic systems

Solar photovoltaic systems must meet the following requirements:

  • the peak power capacity of the installation must be lower than or equal to 30 kW;
  • the system must be:
    • installed on the roof or facade of the building; or
    • incorporated in the building envelope.

Hybrid solar collectors generating hot water and electricity are eligible as photovoltaic collectors.

The electricity storage facility can be an eligible element when applying for financial aid for a new photovoltaic installation if the following conditions are met at the same time:

  1. the storage facility is connected to a solar photovoltaic installation operated in self-consumption mode or as part of an energy community;
  2. the peak power capacity of the solar photovoltaic installation is greater than 4 kW and, in the case of a multi-unit residential building, greater than 1.5 kW per unit;
  3. the storage capacity of the storage facility for the energy produced is less than or equal to:
    • 1.5 kWh per kWpeak of the photovoltaic (PV) installation where the solar photovoltaic installation and the storage facility supply a building used for residential purposes, without exceeding:
      • 12 kWh for a single-family home;
      • 9 kWh per unit in a multi-unit residential building.
    • 1 kWh per kWpeak of the photovoltaic (PV) installation where the solar photovoltaic installation and the storage facility supply a building that is not used for residential purposes.

Heat pumps

Heat pumps concerned

The following heat pumps and hybrid heat pumps are concerned:

  • geothermal heat pumps with vertical sensors (geothermal probes) or horizontal sensors (geothermal collecting lines and baskets) meeting the following coefficient of performance (COP) requirement: COP is equal to or greater than 4.3 at B0/W35, determined in accordance with the EN 14511 standard;
  • hybrid geothermal heat pumps for existing residential buildings that:
    • are installed in addition to an existing heating system to create a hybrid system, or are installed in the form of combined hybrid devices to replace an existing heating system; and
    • must meet the following coefficient of performance (COP) requirement: COP is equal to or greater than 4.3 at B0/W35, determined in accordance with the EN 14511 standard;
  • direct expansion geothermal heat pumps meeting the following coefficient of performance (COP) requirement: COP is equal to or greater than 4.3 at E4/W35, determined in accordance with the EN 14511 standard;
  • heat pumps combined with a latent heat accumulator and a solar thermal collector, meeting the following coefficient of performance (COP) requirement: COP is equal to or greater than 4.3 at B0/W35, determined in accordance with the EN 14511 standard;
  • air-to-water heat pumps (including vented air-to-water heat pumps) meeting the following coefficient of performance (COP) requirement: COP is equal to or greater than 3.1 at A2/W35, determined in accordance with the EN 14511 standard;
  • hybrid air-to-water heat pumps for existing residential buildings that:
    • are installed in addition to an existing heating system to create a hybrid system, or are installed in the form of combined hybrid devices to replace an existing heating system; and
    • must meet the following coefficient of performance (COP) requirement: COP is equal to or greater than 3.1 at A2/W35, determined in accordance with the EN 14511 standard.
Requirements to be met

The relevant heat pump must meet the following requirements:

  • the heating system must be able to supply the heating circuit with a maximum starting temperature of 35°C (35W). If this is not the case, the coefficient of performance of the heat pump must reach at least the required threshold at W35 with the chosen starting temperature;
  • the rated capacity of the heat pump is determined at 100 % output, under the conditions indicated in the previous paragraph;
  • the power supply of the heat pump must be equipped with an electricity meter;
  • the heat pump for which the invoice was issued from 1 January 2024 must be equipped with a heat meter;
  • when a heat pump is installed, the heating network must undergo hydraulic balancing;
  • for heat pumps and hybrid heat pumps for existing residential buildings, a buffer tank with a minimum capacity of 30 l/kW thermal must be installed, with the exception of heat pumps and hybrid heat pumps equipped with a variable frequency drive ('inverter') with speed/power modulation;
  • a geothermal heat pump or hybrid air-to-water heat pump must be able to operate on its own, i.e. in monovalent mode, and the hybrid system must cover at least 70 % of the useful heat demand for the year in heat pump mode;
  • for air-to-water heat pumps and hybrid air-to-water heat pumps, the sound power LW ('Schallleistungspegel'; based on the EN 12102 standard) for the heat pump component installed on the building exterior must meet the following requirements:
Rated capacity of the heat pump according to EN 14511 at 100 % output [kW] Maximum value of the sound power LW based on standard EN 12102 [dB(A)] *
≤ 5 kW 48 dB(A)
> 5 and ≤ 12 kW 51 dB(A)
> 12 kW 55 dB(A)

* For a system whose external component exceeds the maximum value shown in the table above, the value to take into account may be reduced by adding a soundproofing and noise protection system that reduces the sound emitted by the heat pump's external component. The sound-reduction value in dB(A) must be guaranteed and specified in the technical data of the soundproofing equipment.

Alternatively, if the sound power requirements LW in the above table are not met, the noise level, increased where necessary by correction terms, caused at the boundary of the nearest building site to the fixed technical equipment of the heat pump installed outside the building must not exceed 40 dB(A).

In order to demonstrate that the installation complies with this requirement, a noise assessment based on a calculation of noise emissions shall be carried out for the fixed technical components of the heat pump installed outside the building. It is established prior to the installation of the heat pump and exclusively on the basis of a calculation tool called the 'calculatrice des émissions sonores' (noise emission calculator) made available by the Ministry.

For heat pumps without an outdoor unit, installed entirely within the building envelope, the acoustic calculation must be carried out exclusively using the calculation tool provided by the Ministry.

Wood-fuelled boilers

In order to be eligible:

  • the installation must have a controlled combustion system (power and combustion regulation);
  • wood-pellet or wood-chip boilers must be equipped with an automatic feeder and ignition system;
  • wood pellet stoves must be integrated in a central heating system and the degree of useful heat transfer must reach at least 50 %;
  • for staged log combustion boilers and combination wood log-pellet boilers, a buffer tank with a minimum capacity of 55 l/kW rated thermal capacity must be installed;
  • the following emission and yield thresholds must be complied with:
    • particle emission less than or equal to 8 mg/m3;
    • nitrogen oxide (NO) emission less than or equal to 200 mg/m3;
    • boiler production yield greater than or equal to 90%;
    • combustion yield of pellet stove greater than or equal to 90%.

Wood-fuelled boilers may be equipped with a particulate filter (electrostatic or other) whose separation efficiency ('Abscheidegrad') must be such that the particle emission rate of the system after commissioning/acceptance does not exceed 8 mg/m3.

Heating networks and connections

The rate of coverage by renewable energy sources must be greater than or equal to 75% (substantiated by presenting a certificate issued by the heating network operator).

The transfer of heat between the heating network and the residential building must occur through a heat transfer station.

Invoices

Invoices for the technical installations must be issued between 1 January 2022 and 31 December 2025 inclusive at the latest.

Deadlines

Applications for the financial aid must be filed with the Single point of contact for housing assistance within 4 years as of 31 December of the calendar year in which the invoice was issued.

The financial aid may be requested for the investments and services for which the invoice is issued:

  • between 1 January 2022 and 31 December 2025 inclusive;
  • for all technical installations, other than photovoltaic systems, until 31 December 2029 inclusive, if the investments are concurrent with the energy efficiency renovation of an existing building.

If the installations:

  • are not concurrent with the energy efficiency renovation, the deadline for submitting the application is 31 December 2031 at the latest;
  • are concurrent with a new sustainable construction that is eligible under the 2017 aid scheme, the deadline for submitting the application is 31 December 2028 at the latest.

For solar photovoltaic installations operated in self-consumption mode or as part of an energy community, the financial aid allocated is increased by a financial aid bonus of 25 % provided:

  • the order is placed between 1 January 2023 and 31 December 2023 inclusive; and
  • the invoice is issued by 31 December 2025 at the latest.

The financial aid bonus in addition to the financial aid for the replacement of:

  • an existing fossil fuel boiler; or
  • existing electrical heating system;
  • combined with an improvement of the energy performance of the heating system by installing a heat pump, a hybrid heat pump or a wood-fuelled boiler;

is increased from 30 % to 50 % for any installation ordered between 1 November 2022 and 31 December 2023, on condition that the invoice is issued no later than 31 December 2025.

How to proceed

Submitting the application

Applications must be submitted after the work has been completed:

  • either online via MyGuichet.lu or the MyGuichet.lu mobile application (see 'Online services and forms' below). This is a procedure with authentication that requires:
    • a LuxTrust product (Token, Smartcard or Signing Stick); or
    • an electronic identity card (eID);
  • or by post (preferably by registered mail), or by handing in the dedicated form (see 'Online services and forms') at the Single point of contact for housing assistance (Guichet unique des aides au logement):
    • if you are a private individual: the DEPA-2022 aid application form for natural persons; or
    • if you represent a legal person: the DEPA-2022 financial aid application form for legal persons.

Supporting documents

In addition to the financial aid application, you must also provide:

  • the detailed and receipted invoices in connection with the requested financial aid. The invoices may refer to an itemised estimate, in which case the latter must be attached to the invoice;
  • one or more specific technical data sheets, depending on the type of installation:
    • photovoltaic system;
    • heat network or connection to a heat network;
    • solar thermal systems;
    • heat pumps;
    • wood-fuelled boilers;
  • if applicable, the energy consultation related to the technical installation(s) concerned;
  • if applicable, the dated order form for the photovoltaic installation;
  • if applicable, the dated order form for the heat pump or wood-fuelled boiler.

Given that each application may cover different domains depending on the owner's or architect's choices, the various sheets should be accompanied by any additional documents specified on the application forms.

If the application is for a commonhold property or multi-unit residence, you must attach:

  • appendix form COLL-2022;
  • a power of attorney from each owner;
  • the list of the flats, specifying the energy reference area per flat, excluding the common areas.

The Single point of contact for housing assistance may ask you to provide any documents it deems necessary to process the file.

If the aid is granted, the beneficiary's file may be reviewed at any time.

Note: implementing technical installations may also be eligible for financial aid for an energy consultation and a report by an approved energy consultant. If the improvement only applies to a renewable energy-based technical installation, the subsidy will be reduced by 70 %.

Table of subsidies for technical installations

Subsidies for solar thermal systems

An additional flat-rate subsidy of EUR 1,000 may be granted if the solar thermal system is installed concurrently with a wood-fuelled boiler or a heat pump.

Subsidies for solar photovoltaic systems

Technical installation Subsidies Maximum amount
Solar photovoltaic system or Hybrid collectors (for feed-in into the network) 20% of actual costs EUR 500 per kWpeak
Solar photovoltaic system or Hybrid collectors (in self-consumption mode or as part of an energy community) 50 % of actual costs EUR 1,250 per kWpeak
Please note: this aid is increased to 62.5 % of the financial aid for any installation ordered between 1 January 2023 and 31 December 2023, on condition that the invoice is issued no later than 31 December 2025. 62.5 % of actual costs EUR 1,562.5 per kWpeak

Subsidies for heat pumps

Technical installation Subsidies Maximum amount
Geothermal heat pump (geothermal probes, geothermal collectors
or latent heat accumulator systems with solar thermal collector)
50 % of actual costs
  • EUR 8,000 for a single-family house if the rated capacity is less than 10 kWthermal
  • EUR 800 per kWthermal for a single-family house if the rated capacity is greater than 10 kWthermal (EUR 12,000 maximum)
  • EUR 7,500 per residential unit for a multi-unit building or residences connected to a heating network powered by a heat pump (EUR 37,500 maximum)
Air-to-water heat pump or compact device including the controlled mechanical ventilation system and recycled air-to-water heat pump, for new constructions 50 % of actual costs
  • EUR 3,000 for a new single-family house
  • EUR 2,000 per residential unit for a multi-unit building (EUR 10,000 maximum)
Air-to-water heat pump or compact device including the controlled mechanical ventilation system and recycled air-to-water heat pump, for existing residences 50 % of actual costs
  • EUR 5,000 per building if the rated capacity is less than 10 kWthermal
  • EUR 500 per kWthermal per building if the rated capacity is greater than 10kW thermal (EUR 12,000 maximum)
Replacement of an existing fossil fuel boiler or electrical heating system by a wood-fuelled boiler Bonus in the amount of 30 % of the allocated financial aid Please note: this aid is increased to 50 % of the financial aid for any installation ordered between 1 November 2022 and 31 December 2023, on condition that the invoice is issued no later than 31 December 2025.
Removal, neutralisation and recycling of the oil tank (if an oil-fired boiler is being replaced) 50 % of actual costs
  • EUR 2,000 maximum for a single-family house
Adaptation of the existing heat distribution system 50 % of actual costs
  • EUR 2,000 maximum for a single-family house
  • EUR 5,000 maximum for a multi-unit building

Subsidies for wood-fuelled boilers (for existing residences only)

Technical installation Subsidies Maximum amount
Wood pellet or wood chip boiler 50 % of actual costs
  • EUR 750 per kWthermal for a single-family house (EUR 7,500 maximum)
  • EUR 750 per kWthermal for a multi-unit building or residences connected to a heating network powered by a wood-fuelled boiler (EUR 30,000 maximum)
Wood pellet stove (connected to the heating network) 30% of actual costs
  • EUR 2,500 maximum for a single-family house
Log boiler or combination log/pellet boiler 50 % of actual costs
  • EUR 350 per kWthermal
Installation of a buffer tank with a capacity of 30 l/kW (wood pellet or wood chip boiler) Bonus in the amount of 15% of the allocated financial aid
Replacement of an existing fossil fuel boiler or electrical heating system by a wood-fuelled boiler Bonus in the amount of 30 % of the allocated financial aid Please note: this aid is increased to 50 % of the financial aid for any installation ordered between 1 November 2022 and 31 December 2023, on condition that the invoice is issued no later than 31 December 2025.
Removal, neutralisation and recycling of the oil tank (if an oil-fired boiler is being replaced) 50 % of actual costs
  • EUR 2,000 maximum for a single-family house

Urban heating network

Technical installation Subsidies Maximum amount
Connection to an urban heating network 50 % of actual costs
  • EUR 250 per kWthermal (15 kW maximum) for a single-family house
  • EUR 250 per kWthermal (8 kW maximum) for a flat in a multi-unit building
Installation of an urban heating network (at least two residential buildings must be connected) 50 % of actual costs
  • EUR 12,500
Replacement of an existing fossil fuel boiler or electrical heating system by connection to a heating network Bonus in the amount of 30 % of the allocated financial aid
Removal, neutralisation and recycling of the oil tank (if an oil-fired boiler is being replaced) 50 % of actual costs
  • maximum EUR 2,000

Additional aid and bonus

Heat pumps

A financial aid bonus of 30 % may be granted if:

  • the fossil fuel, electric or electric storage heating system was manufactured at least 10 years prior to the year of filing for the financial aid. This bonus is also allocated if, in a hybrid system, a heat pump is combined with an existing fossil fuel boiler and this boiler is removed within 5 years of the date of issue of the invoice;
  • the replaced heating system was used as the main source of heating;
  • a report evaluating the energy performance of the heating system was drawn up using the 'Heizungscheck' tool (not necessary if an electric heating system is being replaced);
  • the upgrades recommended further to the energy performance assessment have been implemented.

The aid bonus is increased from 30 % to 50 % of the financial aid for any installation ordered between 1 November 2022 and 31 December 2023, on condition that the invoice is issued no later than 31 December 2025.

Additional aid for the removal, neutralisation and recycling of the oil tank may be granted if:

  • the oil heating system was manufactured at least 10 years prior to the year of filing of the financial aid;
  • the replaced heating system was used as the main source of heating;
  • an energy performance assessment report for the heating system was established using the 'Heizungscheck' tool;
  • the upgrades recommended further to the energy performance assessment have been implemented.

Additional aid for the adaptation of the existing heating distribution system may be granted if an existing boiler is being replaced by a geothermal heat pump or an air-to-water heat pump, and if:

  • the fossil fuel heating system was manufactured at least 10 years prior to the year of filing of the financial aid;
  • the replaced heating system was used as the main source of heating;
  • an energy performance assessment report for the heating system was established using the 'Heizungscheck' tool;
  • the upgrades recommended further to the energy performance assessment have been implemented.

Wood-fuelled boilers

Aid for the installation of a particulate filter on an existing boiler may be granted. This financial aid is capped at EUR 1,500 and may not exceed 50 % of the actual costs.

A financial aid bonus:

  • of 15 % may be granted if a buffer tank is installed (30 l/kWthermal rated capacity);
  • of 30 % may be granted if:
    • the fossil fuel, electric or electric storage heating system was manufactured at least 10 years prior to the year of filing for the financial aid;
    • the replaced heating system was used as the main source of heating;
    • a report evaluating the energy performance of the heating system was drawn up using the 'Heizungscheck' tool (not necessary if an electric heating system is being replaced);
    • the upgrades recommended further to the energy performance assessment have been implemented.

The aid bonus is increased from 30 % to 50 % of the financial aid for any installation ordered between 1 November 2022 and 31 December 2023, on condition that the invoice is issued no later than 31 December 2025.

Additional aid for the removal, neutralisation and recycling of the oil tank may be granted if:

  • the oil heating system was manufactured at least 10 years prior to the year of filing of the financial aid;
  • the replaced heating system was used as the main source of heating;
  • an energy performance assessment report for the heating system was established using the 'Heizungscheck' tool;
  • the upgrades recommended further to the energy performance assessment have been implemented.

Urban heating network

A financial aid bonus of 30 % may be granted if:

  • the fossil fuel, electric or electric storage heating system was manufactured at least 10 years prior to the year of filing for the financial aid;
  • the replaced heating system was used as the main source of heating.

Additional aid for the removal, neutralisation and recycling of the oil tank may be granted.

Other aid

Some communes grant additional aid. Applicants may estimate the amount of communal aid they are eligible for by using the Klima-Agence simulator.

Note: The nova naturstroum promotional bonus rewards projects that promote renewable energy sources. More information can be found on www.enovos.lu.

Natural gas and electricity suppliers operating in Luxembourg also offer aid programmes for the implementation of energy efficiency measures. The list of suppliers is available on the website of the Luxembourg Regulatory Institute (Institut Luxembourgeois de Régulation - ILR):

Payment of the aid

The aid is generally transferred directly to your bank account.

If you act in your capacity as a legal representative of a group of natural or legal persons, the aid is transferred directly to your bank account and you must immediately credit the bank accounts of the natural or legal persons concerned with their respective share of the aid.

A copy of these payments must be sent to the Single point of contact for housing assistance.

Repayment of the aid

If you have already received the aid, you may be required to return it, if:

Online services and forms

Who to contact

Single point of contact for housing assistance

Single point of contact for housing assistance

  • Ministry of Housing and Spatial Planning Single point of contact for housing assistance

    Address:
    11, rue de Hollerich L-1741 Luxembourg Luxembourg
    Phone:
    (+352) 8002 10 10
    Telephone: Monday to Friday from 8.00 to 16.00
    Email address:
    info@ml.etat.lu
    Closed ⋅ Opens at 13.30
    Wednesday:
    8.00 to 12.00, 13.30 to 16.00
    Thursday:
    Closed
    Friday:
    8.00 to 12.00, 13.30 to 16.00
    Saturday:
    Closed
    Sunday:
    Closed
    Monday:
    8.00 to 12.00, 13.30 to 16.00
    Tuesday:
    8.00 to 12.00, 13.30 to 16.00
    Thursdays by appointment only
  • Ministry of Housing and Spatial Planning Single point of contact for housing assistance

    Address:
    11, rue de Hollerich L-1741 Luxembourg Luxembourg
    Phone:
    (+352) 8002 10 10
    Telephone: Monday to Friday from 8.00 to 16.00
    Email address:
    info@ml.etat.lu
    Closed ⋅ Opens at 13.30
    Wednesday:
    8.00 to 12.00, 13.30 to 16.00
    Thursday:
    Closed
    Friday:
    8.00 to 12.00, 13.30 to 16.00
    Saturday:
    Closed
    Sunday:
    Closed
    Monday:
    8.00 to 12.00, 13.30 to 16.00
    Tuesday:
    8.00 to 12.00, 13.30 to 16.00
    Thursdays by appointment only

Related procedures and links

Procedures

Links

Further information

Legal references

  • Loi modifiée du 23 décembre 2016

    1. instituant un régime d'aides pour la promotion de la durabilité, de l'utilisation rationnelle de l'énergie et des énergies renouvelables dans le domaine du logement; 2. modifiant la loi modifiée du 23 décembre 2004 établissant un système d'échange de quotas d'émission de gaz à effet de serre

  • Règlement grand-ducal modifié du 7 avril 2022

    déterminant les mesures d’exécution de la loi du 23 décembre 2016 instituant un régime d’aides pour la promotion de la durabilité, de l’utilisation rationnelle de l’énergie et des énergies renouvelables dans le domaine du logement

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