The present document specifies methods of measurement of electrical power consumption in networked standby and the
reporting of the results for network interconnecting equipment.
Example of interconnecting equipment are in Annex B.
Power consumption in standby (other than networked standby) is covered by CENELEC EN 50564 [1], including the
input voltage range.
The present document also provides a method to test power management and whether it is possible to deactivate
wireless network connection(s).
The present document applies to electrical products with a rated input voltage of 230 V a.c. for single phase products
and 400 V a.c. for three phase products.
The present document is produced under the mandate M/544 and can be used to demonstrate compliance to the EU
regulation 801/2013 [i.2].
NOTE 1: The EU regulation 801/2013 [i.2] applies to equipment designed for use with a nominal voltage rating of
250 V and below.
NOTE 2: EU regulation 801/2013 [i.2] does not apply to electrical and electronic household and office equipment
placed on the market with a low voltage external power supply to work as intended.
NOTE 3: "Low voltage external power supply" is the definition provided in EU regulation 278/2009 [i.3].
NOTE 4: The measurement of energy consumption and performance of equipment during intended use are
generally specified in product standards and are not covered by the present document.
NOTE 5: Where the present document is referenced by more specific standards or procedures, these should define
and name the relevant conditions to which this test procedure is applied.

Okoljski inženiring (EE) - Električna in elektronska gospodinjska in pisarniška oprema - Meritve porabe energije povezovalne opreme v omrežni pripravljenosti - Harmonizirani standard, ki obravnava merilno metodo po Uredbi ES 1275/2008, dopolnjeni z Uredbo EU 801/2013

Ta dokument določa metode merjenja porabe električne energije v omrežni pripravljenosti in poročanje o rezultatih za povezovalno opremo v omrežju.
Primeri povezovalne opreme so podani v dodatku B.
Poraba energije v pripravljenosti (ki ni omrežna pripravljenost), vključno z razponom vhodne napetosti, je zajeta v standardu CENELEC EN 50564 [1].
Ta dokument zagotavlja tudi metodo za preskušanje upravljanja energije in ali je mogoče onemogočiti brezžične omrežne povezave.
Ta dokument se uporablja za električne izdelke z nazivno vhodno napetostjo 230 V AC za enofazne izdelke in 400 V AC za trifazne izdelke.
Ta dokument je pripravljen v okviru mandata M/544 in ga je mogoče uporabiti za dokazovanje skladnosti z Uredbo EU 801/2013 [i.2].
OPOMBA 1: Uredba EU 801/2013 [i.2] se uporablja za opremo, zasnovano za uporabo z nazivno napetostjo do vključno 250 V.
OPOMBA 2: Uredba EU 801/2013 [i.2] se ne uporablja za električno in elektronsko gospodinjsko in pisarniško opremo, ki je dana na trg z nizkonapetostnim zunanjim napajalnikom, da deluje, kot je načrtovano.
OPOMBA 3: »Nizkonapetostni zunanji napajalnik« je definicija iz Uredbe 278/2009 [i.3].
OPOMBA 4: Meritve porabe energije in zmogljivosti opreme med predvideno uporabo so običajno določene v standardih za izdelke in niso zajete v tem dokumentu.
OPOMBA 5: Kjer se ta dokument sklicuje na več določenih standardov ali postopkov, naj bi ti opredelili in poimenovali ustrezne pogoje, za katere se uporablja ta preskusni postopek.

General Information

Status
Published
Public Enquiry End Date
31-Jul-2018
Publication Date
12-Sep-2018
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
27-Aug-2018
Due Date
01-Nov-2018
Completion Date
13-Sep-2018

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Environmental Engineering (EE) - Electrical and electronic household and office equipment - Measurement of networked standby power consumption of Interconnecting equipment - Harmonised Standard covering the measurement method for EC Regulation 1275/2008 amended by EU Regulation 801/201335.260Pisarniški strojiOffice machines27.015VSORãQREnergy efficiency. Energy conservation in general19.040Preskušanje v zvezi z okoljemEnvironmental testingICS:Ta slovenski standard je istoveten z:ETSI EN 303 423 V1.2.1 (2018-08)SIST EN 303 423 V1.2.1:2018en01-november-2018SIST EN 303 423 V1.2.1:2018SLOVENSKI

STANDARD
SIST EN 303 423 V1.2.1:2018

ETSI EN 303 423 V1.2.1 (2018-08) Environmental Engineering (EE); Electrical and electronic household and office equipment; Measurement of networked standby power consumption of Interconnecting equipment; Harmonised Standard covering the measurement method for EC Regulation 1275/2008 amended by EU Regulation 801/2013

HARMONISED EUROPEAN STANDARD SIST EN 303 423 V1.2.1:2018
ETSI ETSI EN 303 423 V1.2.1 (2018-08) 2

Reference REN/EE-EEPS34 Keywords customer premises networks, energy efficiency, network, power measurement ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE

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Important notice The present document can be downloaded from: http://www.etsi.org/standards-search The present document may be made available in electronic versions and/or in print. The content of any electronic and/or print versions of the present document shall not be modified without the prior written authorization of ETSI. In case of any existing or perceived difference in contents between such versions and/or in print, the only prevailing document is the print of the Portable Document Format (PDF) version kept on a specific network drive within ETSI Secretariat. Users of the present document should be aware that the document may be subject to revision or change of status. Information on the current status of this and other ETSI documents is available at https://portal.etsi.org/TB/ETSIDeliverableStatus.aspx If you find errors in the present document, please send your comment to one of the following services: https://portal.etsi.org/People/CommiteeSupportStaff.aspx Copyright Notification No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm except as authorized by written permission of ETSI. The content of the PDF version shall not be modified without the written authorization of ETSI. The copyright and the foregoing restriction extend to reproduction in all media.

© ETSI 2018. All rights reserved.

DECTTM, PLUGTESTSTM, UMTSTM and the ETSI logo are trademarks of ETSI registered for the benefit of its Members. 3GPPTM and LTETM are trademarks of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. oneM2M logo is protected for the benefit of its Members. GSM® and the GSM logo are trademarks registered and owned by the GSM Association. SIST EN 303 423 V1.2.1:2018

ETSI ETSI EN 303 423 V1.2.1 (2018-08) 3 Contents Intellectual Property Rights ................................................................................................................................ 5 Foreword ............................................................................................................................................................. 5 Modal verbs terminology .................................................................................................................................... 5 Introduction ........................................................................................................................................................ 6 1 Scope ........................................................................................................................................................ 7 1.1 Equipment in the scope of the present document ............................................................................................... 7 1.2 Equipment not in the scope of the present document ......................................................................................... 7 2 References ................................................................................................................................................ 7 2.1 Normative references ......................................................................................................................................... 7 2.2 Informative references ........................................................................................................................................ 8 3 Definitions and abbreviations ................................................................................................................... 9 3.1 Definitions .......................................................................................................................................................... 9 3.2 Abbreviations ................................................................................................................................................... 10 4 Information required for testing purposes .............................................................................................. 11 4.1 Information about networked port(s) ................................................................................................................ 11 4.2 Power management function - periods & conditions ....................................................................................... 11 4.3 Activation and deactivation of wireless network connections .......................................................................... 11 5 Measurement conditions......................................................................................................................... 12 5.1 Common requirements ..................................................................................................................................... 12 5.2 Test room.......................................................................................................................................................... 12 5.3 Power supply .................................................................................................................................................... 12 5.4 Power measuring instruments........................................................................................................................... 12 5.5 Configuration of network ports ........................................................................................................................ 12 5.6 Measurement uncertainty ................................................................................................................................. 15 6 Measurement procedures ........................................................................................................................ 15 6.1 General ............................................................................................................................................................. 15 6.2 Wireless network port management ................................................................................................................. 15 6.2.0 General ........................................................................................................................................................ 15 6.2.1 Test sequence .............................................................................................................................................. 15 6.2.2 Verifying that wireless connections are deactivated ................................................................................... 15 6.2.3 Verifying that wireless logical network port is active................................................................................. 16 6.3 Preparation of the EUT and general testing aspects ......................................................................................... 16 6.4 Power management, reactivation and networked standby power consumption ............................................... 16 6.5 Measurement of standby power consumption with all network ports disconnected ........................................ 17 6.6 Measurement of networked standby power consumption with all network ports connected ........................... 17 7 Test report .............................................................................................................................................. 18 7.1 Test and laboratory details................................................................................................................................ 18 7.2 Details of product under test............................................................................................................................. 18 7.3 Test parameters and network configuration ..................................................................................................... 18 7.4 Measured and documented data ....................................................................................................................... 18 Annex A (informative): Relationship between the present document and the ecodesign requirements of the Commission Regulation (EU) n° 801/2013 ................ 19 Annex B (informative): Equipment classification ............................................................................... 21 B.1 General ................................................................................................................................................... 21 Annex C (informative): General information on network technologies and network configurations with respect to power consumption .................................... 24 C.1 Examples of network port configuration ................................................................................................ 24 SIST EN 303 423 V1.2.1:2018

ETSI ETSI EN 303 423 V1.2.1 (2018-08) 4 Annex D (informative): Information to be provided to the user and other interested parties ........ 25 D.1 Information to be provided to the user and other interested parties ....................................................... 25 D.1.1 Information available on-line ........................................................................................................................... 25 D.1.2 Information available in the user manual ......................................................................................................... 25 Annex E (informative): Example of a test report template ................................................................ 26 Annex F (informative): Bibliography ................................................................................................... 28 Annex G (informative): Change history ............................................................................................... 29 History .............................................................................................................................................................. 30

SIST EN 303 423 V1.2.1:2018

ETSI ETSI EN 303 423 V1.2.1 (2018-08) 5 Intellectual Property Rights Essential patents IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (https://ipr.etsi.org/). Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may become, essential to the present document. Trademarks The present document may include trademarks and/or tradenames which are asserted and/or registered by their owners. ETSI claims no ownership of these except for any which are indicated as being the property of ETSI, and conveys no right to use or reproduce any trademark and/or tradename. Mention of those trademarks in the present document does not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks. Foreword This Harmonised European Standard (EN) has been produced by ETSI Technical Committee Environmental Engineering (EE). The present document has been prepared under the Commission's standardisation M/544 to provide one voluntary means of conforming to the ecodesign requirements of Commission Regulation (EU) n° 801/2013 [i.2] of 22 August 2013 implementing Directive 2009/125/EC of the European Parliament and of the Council with regard to ecodesign requirements for standby, off mode electric power consumption of electrical and electronic household and office equipment (EC No 1275/2008 [i.1]) and ecodesign requirements for televisions (EC No 642/2009 [i.10]). Once the present document is cited in the Official Journal of the European Union under that Regulation, compliance with the normative clauses of the present document given in table A.1 confers, within the limits of the scope of the present document, a presumption of conformity with the corresponding ecodesign requirements of that Regulation, and associated EFTA Regulations.

National transposition dates Date of adoption of this EN: 6 August 2018 Date of latest announcement of this EN (doa): 30 November 2018 Date of latest publication of new National Standard or endorsement of this EN (dop/e):

31 May 2019 Date of withdrawal of any conflicting National Standard (dow): 31 May 2020

Modal verbs terminology In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and "cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of provisions). "must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation. SIST EN 303 423 V1.2.1:2018

ETSI ETSI EN 303 423 V1.2.1 (2018-08) 6 Introduction The methods defined in the present document are intended to define requirements for the measurement of the power consumed by the interconnecting equipment having one or more wired or wireless networked port(s) able to resume a function by way of a remotely initiated trigger or reactivation trigger from a network connection. The present document also provides a method to test power management and whether it is possible to deactivate wireless network connection(s). For the measurement of low power modes, reference is made to CENELEC EN 50564 [1].

SIST EN 303 423 V1.2.1:2018

ETSI ETSI EN 303 423 V1.2.1 (2018-08) 7 1 Scope 1.1 Equipment in the scope of the present document The present document specifies methods of measurement of electrical power consumption in networked standby and the reporting of the results for network interconnecting equipment. Example of interconnecting equipment are in Annex B. Power consumption in standby (other than networked standby) is covered by CENELEC EN 50564 [1], including the input voltage range. The present document also provides a method to test power management and whether it is possible to deactivate wireless network connection(s). The present document applies to electrical products with a rated input voltage of 230 V a.c. for single phase products and 400 V a.c. for three phase products. The present document is produced under the mandate M/544 and can be used to demonstrate compliance to the EU regulation 801/2013 [i.2]. NOTE 1: The EU regulation 801/2013 [i.2] applies to equipment designed for use with a nominal voltage rating of 250 V and below. NOTE 2: EU regulation 801/2013 [i.2] does not apply to electrical and electronic household and office equipment placed on the market with a low voltage external power supply to work as intended. NOTE 3: "Low voltage external power supply" is the definition provided in EU regulation 278/2009 [i.3]. NOTE 4: The measurement of energy consumption and performance of equipment during intended use are generally specified in product standards and are not covered by the present document. NOTE 5: Where the present document is referenced by more specific standards or procedures, these should define and name the relevant conditions to which this test procedure is applied. 1.2 Equipment not in the scope of the present document The present document does not apply to the measurement of electrical power consumption in networked standby for edge equipment. The edge equipment is a networked equipment that can be connected to a network and interact with that network or other devices and that does not have, as its primary function, the passing of network traffic to provide a network. Edge equipment are covered in CENELEC EN 50643 [i.8]. 2 References 2.1 Normative references References are specific, identified by date of publication and/or edition number or version number. Only the cited version applies. Referenced documents which are not found to be publicly available in the expected location might be found at https://docbox.etsi.org/Reference/. NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee their long term validity. The following referenced documents are necessary for the application of the present document. [1] CENELEC EN 50564 (2011): "Electrical and electronic household and office equipment - measurement of low power consumption". SIST EN 303 423 V1.2.1:2018

ETSI ETSI EN 303 423 V1.2.1 (2018-08) 8 2.2 Informative references References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the referenced document (including any amendments) applies. NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee their long term validity. The following referenced documents are not necessary for the application of the present document but they assist the user with regard to a particular subject area. [i.1] Commission Regulation (EC) No 1275/2008 of 17 December 2008 implementing Directive 2005/32/EC of the European Parliament and of the Council with regard to ecodesign requirements for standby and off mode electric power consumption of electrical and electronic household and office equipment. [i.2] Commission Regulation (EU) No 801/2013 of 22 August 2013 amending Regulation (EC) No 1275/2008 with regard to ecodesign requirements for standby, off mode electric power consumption of electrical and electronic household and office equipment, and amending Regulation (EC) No 642/2009 with regard to ecodesign requirements for televisions. [i.3] Commission Regulation (EC) No 278/2009 of 6 April 2009 implementing Directive 2005/32/EC of the European Parliament and of the Council with regard to ecodesign requirements for no-load condition electric power consumption and average active efficiency of external power supplies. [i.4] ETSI EN 301 575 (05-2012): "Environmental Engineering (EE); Measurement method for energy consumption of Customer Premises Equipment (CPE)". [i.5] European Commission Directorate-General, Joint Research Centre: "Code Of Conduct on Energy Consumption of Broadband Communication Equipment"; Final V5: 20 December 2013. NOTE: Available at http://iet.jrc.ec.europa.eu/energyefficiency/sites/energyefficiency/files/files/documents/ICT_CoC/cocv5-broadband_final.pdf. [i.6] Cablelabs: "Data-Over-Cable Service Interface Specifications - DOCSIS® 2.0 Interface". [i.7] Cablelabs: "Data-Over-Cable Service Interface Specifications- DOCSIS® 3.0 Interface". [i.8] CENELEC EN 50643: "Electrical and electronic household and office equipment - Measurement of networked standby power consumption of edge equipment". [i.9] IEC 60050: "International Electrotechnical Vocabulary". [i.10] Commission Regulation (EC) No 642/2009 of 22 July 2009 implementing Directive 2005/32/EC of the European Parliament and of the Council with regard to ecodesign requirements for televisions. [i.11] IEC IEV ref 904-03-01: "Enviromental standardization for electrical and elctronic products and systems". NOTE: Available at http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=904-03-01. [i.12] IEEE 802.11™-2012: "IEEE Standard for Information technology--Telecommunications and information exchange between systems Local and metropolitan area networks--Specific requirements Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications". SIST EN 303 423 V1.2.1:2018

ETSI ETSI EN 303 423 V1.2.1 (2018-08) 9 3 Definitions and abbreviations 3.1 Definitions For the purposes of the present document the terms and definitions given in CENELEC EN 50564 [1] and the following apply: NOTE: When the present document is used to provide presumption of conformity to a European Directive or Regulation, definitions given in the Directive or Regulation prevail. edge equipment: networked equipment that can be connected to a network and interact with that network or other equipment and that does not have, as its primary function, the passing of network traffic to provide a network NOTE: Examples of edge equipment are given in Annex B. interconnecting equipment: networked equipment that has, as its primary function, the passing of network traffic to provide a network NOTE: Examples of interconnecting equipment are given in Annex B. logical network port: network technology running over a physical network port NOTE 1: EU Commission Regulation n° 801/2013 [i.2] definition. NOTE 2: Different communication protocols result in different network technologies. low voltage power supply: external power supply with a nameplate output voltage of less than 6 volts and a nameplate output current greater than or equal to 550 milliamperes NOTE: EC Commission Regulation n° 278/2009 [i.3] definition. network: communication infrastructure with a topology of links, an architecture, including the physical components, organizational principles, communication procedures and formats (protocols) NOTE: EU Commission Regulation n° 801/2013 [i.2] definition. network availability: capability of the equipment to resume functions after a remotely initiated trigger has been detected by a network port NOTE: EU Commission Regulation n° 801/2013 [i.2] definition. network port: wired or wireless physical interface of the network connection located on the equipment through which the equipment can be remotely activated NOTE 1: EU Commission Regulation n° 801/2013 [i.2] definition. NOTE 2: The International Electrotechnical Vocabulary (IEC 60050 [i.9]) defines "port (of a network)" as: "a termination through which signals can enter or leave a network".

networked equipment: equipment that can connect to a network and has one or more network ports NOTE: EU Commission Regulation n° 801/2013 [i.2] definition. networked standby: condition in which the equipment is able to resume a function by way of a remotely initiated trigger from a network connection NOTE: EU Commission Regulation n° 801/2013 [i.2] definition. physical network port: physical (hardware) medium of a network port. A physical network port can host two or more network technologies NOTE 1: EU Commission Regulation n° 801/2013 [i.2] definition. NOTE 2: A "physical network port" can consist of multiple "logical network ports". SIST EN 303 423 V1.2.1:2018

ETSI ETSI EN 303 423 V1.2.1 (2018-08) 10 power management: automatic control mechanism that achieves the smallest input power consistent with a pre-determined level of functionality NOTE: Source: IEV 904-03-01 [i.11], modified by omission of the note to entry. reactivation trigger: signal that brings the equipment back to active mode NOTE: The reactivation may be remotely initiated. remotely initiated trigger: signal that comes from outside the equipment via a network NOTE: EU Commission Regulation n° 801/2013 [i.2] definition. 3.2 Abbreviations For the purposes of the present document, the following abbreviations apply: AC Alternating Current ADSL Asymmetric Digital Subscriber Line ADSL2plus Second generation ADSL with extended bandwidth AP Access Point BOB Buffered On Board CPU Central Processing Unit CRC Cyclic Redundancy Check DC Direct Current DOCSIS® Data Over Cable Service Interface Specification DSL Digital Subscriber Line ECC Error-Correcting Code EFTA European Free Trade Association EPON Ethernet Passive Optical Network EUT Equipment Under Test FB Frame Buffer FXS Foreign eXchange Station GPON Gigabyte Passive Optical Network HiNA High Network Availability HPNA Home Phoneline Networking Alliance IP Internet Protocol LAN Local Area Network MTBF Mean Time Between Failures OS Operating System PCI Peripheral Component Interconnect PCI-E Peripheral Component Interconnect Express PCI-X Peripheral Component Interconnect eXtended POF Plastic Optical Fiber PSD Power Spectral Density QAM Quadrature Amplitude Modulation RF Radio Frequency UMA Uniform Memory Access USB Universal Serial Bus VDSL Very high speed Digital Subscriber Line VDSL2 Second generation VDSL WAN Wide Area Network WiMAX Worldwide Interoperability for Microwave Access XG-PON 10-Gigabit-capable Passive Optical Network SIST EN 303 423 V1.2.1:2018

ETSI ETSI EN 303 423 V1.2.1 (2018-08) 11 4 Information required for testing purposes 4.1 Information about networked port(s) For each type of physical and associated logical networked port, the following information shall be provided by the manufacturer: a) the default time after which the power management function, or a similar function, automatically switches the equipment into networked standby, and if available, the procedure for: 1) setting a time shorter than the default time; and/or 2) manually switching the equipment into networked standby; b) the characteristics of the reactivation trigger (message, signal, etc.) that is used to reactivate the equipment when in networked standby and how to remotely initiate it; c) the maximum performance specifications, e.g. the maximum speed or data rate supported by that networked port; d) the (maximum) power consumption of the equipment in a condition providing networked standby into which power management function, or a similar function, will switch the equipment, if only this port is used for remote activation, e.g. the declared power consumption of the equipment under defined conditions for a type of port; e) the communication protocol used by equipment; f) the radio frequency range at which each radio wireless logical network port operates; g) the characteristics of wireless logical network ports other than radio wireless logical network ports. NOTE: Annex D describes examples of product information for network equipment. 4.2 Power management function - periods & conditions The manufacturer shall provide information on: • whether the equipment under test provides a power management or a similar function. If the EUT does not provide power management or a similar function, the manufacturer shall indicate why such a function would be inappropriate for the intended use; • the default period of time after which the power management function, or a similar function, switches the equipment automatically into a condition providing networked standby. NOTE: According to European Regulation n° 1275/2008 [i.1] (as amended by EU Regulation n° 801/2013 [i.2]), the maximum default period is given as 20 minutes during which the equipment has not been providing its main function. 4.3 Activation and deactivation of wireless network connections The manufacturer shall provide information on the procedure the user needs to follow in order to activate and deactivate each wireless network connection, if any. The above requirement does not apply to equipment which relies on a single wireless network connection for intended use and does not have a wired network connection. SIST EN 303 423 V1.2.1:2018

ETSI ETSI EN 303 423 V1.2.1 (2018-08) 12 5 Measurement conditions 5.1 Common requirements The general conditions for measurements specified in clause 4.1 of CENELEC EN 50564 [1] shall apply. The tests described in clause 6 of the present document shall be repeated, if applicable, for each type of network port. Each type of logical network port (as declared by the manufacturer) using the same physical network port shall be tested. Where the manufacturer declares that multiple physical network ports have the same technical and logical specification(s), tests shall be executed with any one of these physical network ports being connected (the other ones being deactivated for wireless network ports and disconnected for wired network ports). When a logical network port, as declared by the manufacturer, supports multiple editions of a communication technology standard (e.g. for backward compatibility), the logical network port is tested only according to the specifications of the latest standard edition used by the EUT for retrieving a reactivation message. Examples are shown in Annex C. NOTE: Some devices can be designed to switch to a lower data rate during networked standby in order to further reduce energy consumption. In orde

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