State of Jammu-Kashmir - Act
Jammu and Kashmir State Electricity Regulatory Commission (Grid Interactive Rooftop Solar Photo Voltaic Systems based on Net Metering) Regulations, 2015, in short, JKSERC Net Metering Regulations, 2015
JAMMU & KASHMIR
India
India
Jammu and Kashmir State Electricity Regulatory Commission (Grid Interactive Rooftop Solar Photo Voltaic Systems based on Net Metering) Regulations, 2015, in short, JKSERC Net Metering Regulations, 2015
Rule JAMMU-AND-KASHMIR-STATE-ELECTRICITY-REGULATORY-COMMISSION-GRID-INTERACTIVE-ROOFTOP-SOLAR-PHOTO-VOLTAIC-SYSTEMS-BASED-ON-NET-METERING-REGULATIONS-2015-IN-SHORT-JKSERC-NET-METERING-REGULATIONS-2015 of 2015
- Published on 15 October 2015
- Commenced on 15 October 2015
- [This is the version of this document from 15 October 2015.]
- [Note: The original publication document is not available and this content could not be verified.]
1. Short title and commencement.
- 1.1 These Regulations may be called the Jammu and Kashmir State Electricity Regulatory Commission (Grid Interactive Rooftop Solar Photo Voltaic Systems based on Net Metering) Regulations, 2015, in short, JKSERC Net Metering Regulations, 2015.2. Definitions and interpretation.
- 2.1 In these Regulations, unless the context otherwise requires,-(a)"Act" means the Jammu and Kashmir Electricity Act, 2010 (Act XIII of 2010), as amended from time to time ;(b)"Agreement" means an agreement signed by the distribution licensee with the eligible consumer for net metering arrangement ;(c)"Billing Cycle" or "Billing Period" means the period for which regular electricity bills as specified by the Commission are issued by the distribution licensee to different categories of consumers ;(d)"Commission" means the Jammu and Kashmir State Electricity Regulatory Commission ;(e)"Connected Load" means the sum of the rated capacities in KW/HP of all energy consuming including portable apparatus duly wired and connected to the power supply system in the consumer's premises. However, this shall not include the load of extension plug sockets, standby or spare energy consuming apparatus, installed through change over switch, which cannot be operated simultaneously and any other load exclusively meant for fire-fighting purposes. In case of domestic consumers, load of geysers plus heaters or of air conditioners without heaters, whichever is higher, is to be considered. Any equipment which is under installation and not connected electrically, equipment stored in warehouse/showrooms either as spare or for sale is not to be considered as part of the connected load ;(f)"Consumer" means any person who is supplied with electricity for his own use by a licensee or the Government or by any other person engaged in the business of supplying electricity to the public under the Act or any other law for the time being in force and includes any person whose premises are for the time being connected for the purpose of receiving electricity with the works of distribution licensee, the Government or such other person, as the case may be ;(g)"Contract Demand" or "Contracted Load" means the maximum demand (in kW, kVA or BHP units) contracted by the consumer in Agreement with the Licensee. The contract demand cannot be reduced to less than 60% of the sanctioned/connected load ;(h)"Distribution Licensee" or "Licensee" means a person granted a licence under section 14 of the Act and authorized to operate and maintain a distribution system for supplying electricity to the consumers in his area of supply and includes J&K Power Development Department ;(i)"Eligible Consumer" means a consumer of electricity in the area of supply of distribution licensee, who uses a rooftop SPV System installed in his premises to offset part or all of the consumer's own electrical requirements, given that such systems can be 'self owned' or 'third party owned' ;(j)"Financial Year" or "Year" means period beginning from first day of April and ending with thirty first day of March of next year ;(k)"Interconnection Point" means the interface of rooftop solar power generation facility under net metering arrangements with the network of distribution licensee and shall normally be the point where net meter is installed ;(l)"Invoice" means the monthly bill or a supplementary bill or a monthly invoice or a supplementary invoice raised by the distribution licensee to the consumer ;(m)"kWp" means kilo Watt peak ;(n)"Net Metering" means an arrangement under which rooftop SPV System installed at eligible consumer premises delivers surplus electricity, if any, through net meter to distribution licensee for offsetting the electricity supplied by distribution licensee during the applicable or subsequent billing period but within settlement period ;(o)"Obligated Entity" means the entity mandated by the Commission under clause (e) of sub-section (1) of section 71 of the Act to fulfill the renewable purchase obligation and identified under JKSERC (Renewable Purchase Obligation, its compliance and REC Framework Implementation) Regulations, 2011, as amended from time to time ;(p)"Premises" means rooftops or/and elevated areas on the land, building or infrastructure or part or combination thereof in respect of which a separate meter or metering arrangement have been made by the distribution licensee for the supply of electricity ;(q)"Renewable Energy Certificate" (REC) means the certificate issued in accordance with the procedures prescribed in Central Electricity Regulatory Commission (Terms and Conditions for recognition and issuance of Renewable Energy Certificate for Renewable Energy Generation) Regulations, 2010 as amended from time to time ;(r)"Rooftop Solar System" means the Solar Photo Voltaic System installed in the premises of the consumer that uses solar energy for direct conversion into electricity through photo voltaic technology ;(s)"Sanctioned Load" means the load in kW, kVA or BHP, which the Licensee has agreed to supply from time to time subject to the governing terms and conditions. The total Connected Load is required to be sanctioned by the competent authority ;(t)"Settlement Period" means the period beginning from first day of April of a year and ending with thirty first day of March of next year ;(u)"Solar Meter" means a unidirectional energy meter installed as an integral part of the net metering system at the point at which electricity generated by Solar Photo Voltaic (SPV) System, is delivered to the main panel of eligible consumer ;(v)"State Agency" means the agency as designated by the Commission under Regulation 9 of the JKSERC (Renewable Power Purchase Obligation, its compliance and REC Framework Implementation) Regulations, 2011 ;(w)"Supply Code" means the Jammu and Kashmir State Electricity Regulatory Supply Code, 2011, as amended from time to time ;(x)"Tariff Order" in respect of a licensee means the Order issued by the Commission for the relevant year for that licensee indicating the rates to be charged by the licensee from various categories of consumers for supply of electrical energy and for other services ;(y)"Third Party Owner" means a developer who is generating solar energy on a rooftop but does not own the rooftop, and who also enters into a lease/ commercial agreement with the rooftop owner.3. Scope and application.
- 3.1 These Regulations shall apply to distribution licensee and consumers of such distribution licensee in the State of Jammu and Kashmir.4. General conditions.
- The distribution licensee shall offer the provision of net metering arrangement to the eligible consumer, who intends to install grid connected rooftop solar system, in its area of supply on non-discriminatory and first come first serve basis subject to target capacity :Provided, the consumer is eligible to install the grid connected rooftop solar system of the rated capacity as specified in these regulations :Provided further that the distribution licensee shall offer the provision of net metering to the consumer for the target capacity as specified in these regulations :Provided also that the interconnection of such system with the grid is undertaken as specified in CEA (Technical Standards for Connectivity of the Distributed Generation Resources) Regulations, 2013, as amended from time to time :Provided also that the distribution licensee shall accept the SPV power as per the useful life of the SPV System as per CERC Regulations.5. Capacity target for distribution licensee.
- 5.1 The distribution licensee shall provide net metering arrangement to eligible consumers as long as the total capacity (in MW) of rooftop solar systems does not exceed the target capacity determined by the Commission :Provided that initially, a maximum cumulative capacity to be installed by eligible consumers under net metering in the area of supply of each distribution licensee shall be as decided by the Commission. Thereafter, the target capacity shall be reviewed on yearly basis by the Commission :Provided further the cumulative capacity of rooftop solar system to be allowed to a particular distribution transformer shall not exceed 20% of the rated capacity of the distribution transformer.6. Eligible consumer and individual project capacity.
- 6.1 All eligible consumers of electricity in the area of the supply of distribution licensee can participate in the solar rooftop net metering arrangement subject to target capacity.7. Procedures for application and registration.
- 7.1 The Eligible Consumer who proposes to install a solar energy system in his premises shall apply in the application form (Annexure-II), which the distribution licensee shall notify on its website as downloadable as well as make available at the relevant sub-divisional office of the distribution licensee along with the application/processing fee of Rs. 100/kW subject to a maximum of Rs. 10,000.8. Interconnection with the Grid, Standards and Safety.
- 8.1 The interconnection of the Rooftop PV Solar Power Plant with the network of the distribution licensee shall be made as per the technical specifications and standards for connectivity provided in the Central Electricity Authority (Technical Standards for Connectivity of the Distributed Generation Resources) Regulations, 2013, as amended from time to time.| S. No. | Connected load of Eligible Consumer | Connectivity level |
| 1. | Up to 5 kW | 240 V-single phase |
| 2. | Above 5 kW and up to 100 KW | 415 V-three phase |
| 3. | Above 100 kW | HT/EHT level |
9. Third Party Owned Rooftop Solar PV System based on net metering.
- 9.1 The third party owned rooftop solar PV net metering model may consist of the developer or intermediaries leasing out solar PV system to interested rooftop owners. The owner of the premises provides the rooftop and engages a turnkey installer to design and install the system. The installers may also offer integrated service of leasing, commissioning and maintenance of Solar PV System to owners and guaranteeing standards of performance.10. Metering arrangement.
- 10.1 The metering system shall be as per the regulations for installation and operation of meters for rooftop solar systems under net metering arrangement specified in these regulations.11. Energy Accounting and Settlement.
- 11.1 The accounting of the electricity generated, consumed and injected by the rooftop solar system under these regulations shall become effective from the date of connectivity of such system with the network of distribution licensee.12. Applicability of other charges.
- The rooftop solar system under net metering arrangement whether self-owned or third party owned, installed on the premises of eligible consumer, shall be exempted from various provisions of JKSERC (Terms and Conditions for Intra State Open Access) Regulations, 2015, as amended from time to time :Provided that the Commission may review such exemption from time to time.13. Eligibility to participate under Renewable Energy Certificate (REC) Mechanism.
- The eligibility for issuance of renewable energy certificate shall be as per the eligibility criteria specified under Central Electricity Regulatory Commission (Terms and Conditions for recognition and issuance of Renewable Energy Certificate for Renewable Energy Generation) Regulations, 2010, as amended from time to time.14. Renewable Purchase Obligation (RPO)
-The quantum of electricity consumed by eligible consumer, who is not defined as obligated entity, from the rooftop solar system under net metering arrangement shall qualify towards compliance of Renewable Purchase Obligation (RPO) for the distribution licensee.15. Penalty.
- In case of failure to meet the requirements under these regulations for net metering, the solar power generator shall be liable to pay penalty as decided by the Commission from time to time.16. Termination of agreement.
- 16.1 The eligible consumer may terminate the agreement at any time by giving 30 days prior written notice to the licensee.17. Power to give directions.
- The Commission may from time to time issue such directions and orders as considered appropriate for implementation of these regulations.18. Removal of difficulties.
- If any difficulty arises in giving effect to the provisions of these regulations, the Commission may, by an order, make such provision, not being inconsistent with the Act and these regulations, which appears to the Commission to be necessary for removal of the difficulties.19. Power to relax.
- The Commission may by general or special order, for reasons to be recorded in writing and after giving an opportunity of hearing to the parties likely to be affected, may relax any of the provisions of these regulations on its own or on an application made before it by an interested person.20. Power to amend.
- The Commission may from time to time add, vary, alter, suspend, modify, amend or repeal any provisions of these regulations.Annexure-IList of Abbreviations| AC | Alternating Current |
| AT&C | Aggregate Technical and Commercial |
| BHP | Brake Horse Power |
| BIS | Bureau of Indian Standards |
| CB | Circuit Breaker |
| CEA | Central Electricity Authority |
| CT | Current Transformer |
| DC | Direct Current |
| EHT | Extra High Tension |
| EHV | Extra High Voltage |
| FOR | Forum of Regulators |
| GBI | Generation Based Incentive |
| GIS | Geographic Information System |
| GoI | Government of India |
| GoJK | Government of Jammu and Kashmir |
| GPS | Geographic Positioning System |
| GSM | Global System for Mobile Communications |
| GSS | Grid Sub-station |
| HT | High Tension |
| IEC | International Electro-technical Commission |
| IEEE | Institution of Electrical and ElectronicsEngineers |
| JKSERC | J&K State Electricity Regulatory Commission |
| KV | Kilo Volt |
| KVA | Kilo Volt Ampere |
| KW | Kilo Watt |
| KWh | Kilo-Watt hour |
| LT | Low Tension |
| MNRE | Ministry of New and Renewable Energy |
| MPLS | Multiprotocol Label Switching |
| MVA | Mega Volt-Ampere |
| NM | Net Meter |
| O&M | Operation and Maintenance |
| PCU | Power Conditioning Unit |
| PT/VT | Potential/Voltage Transformer |
| RE | Renewable Energy |
| REC | Renewable Energy Certificate |
| RPO | Renewable Purchase Obligation |
| SLDC | State Load Despatch Centre |
| SM | Solar Meter |
| SPV | Solar Photo Voltaic |
| TVM | Tri-Vector Meter |
| References of the Standards | |
| Standard | Reference |
| IS 13779-1999 | Standards for single or polyphase electrostaticwatt hour meters |
| IS 14697 | Standards for static transformer operated watthour meters and VAR hour meters |
| IEEE 61000 | Equipment standards to control/curtail flicker |
| IEEE 519 | Standards for Limitation for Total HarmonicDistortion |
| IEC 61215 | Standards for Crystalline Silicon TerrestrialPhoto Voltaic (PV) modules-Design qualification and type approval |
| IEC 61646 | Standards for thin film terrestrial photovoltaic(PV) modules-Design qualification and type approval |
| IEC 61730 | Standard for Photovoltaic (PV) module safetyqualification- Part1 : Requirement foconstruction Part 2 :Requirements for testing |
| IEC 61701 Standards for Salt mist corrosiontesting for modules used in coastal corrosive atmosphere | |
| IEC 60068-2 | (1, 2, 14, 30) Standards for power conditioningunit/ inverters for efficiency measurement and environment tests |
| IEC 60502 | Standards for power cables with extrudedinsulation and their accessories for rated voltages from 1kV(Um=1.2 KV up to 30 Kv(Um=36 kV) |
| IEC 60227 | Standards for polyvinyl chloride insulatedcables of rated voltages up to and including 450/750 V |
| IEC 62116 | Standards for utility-inter connectedphotovoltaic inverters-Test procedures of islanding preventionmeasures. |
1. Name of applicant
2. Address of applicant
3. Service connection number/Consumer ID
4. (a) Sanctioned load
5. Service connection tariff
6. Telephone number(s)
7. Email ID
8. Solar PV plant capacity (kilo Watts)
9. Solar grid inverter make and type
10. Solar grid inverter has automatic isolation protection (Y/N) ?
11. Has a Solar Generation Meter been installed (Y/N) ?
12. Expected date of commissioning of solar PV sytem
13. Details of test certificates of Solar PV Plant/inverter for standards required under the Regulations.
Name :Signature :Net metering Application AcknowledgementReceived an application for a solar energy net metering connection from,Name :Date :Service Connection Number/Consumer ID :Application Registration No. :Solar Plant Capacity :Name of Officer :Signature :Designation/(Name of Discom)Annexure-IIINet Metering interconnection agreementThis Agreement is made and entered into at (location)____on this (date) _______ day of (month)______ year _____ between.The Eligible Consumer, by the name of_________having premises at (address) ______________ as first party.AndDistribution Licensee (herein after called as Licensee) and reprsented by___________(designation of office) and having its registered office at (address)_____________________________ as second party of the agreement.And whereas, the Licensee agrees to provide grid connectivity to the Eligible Consumer for injection of the electricity generated from his SPV plant of capacity_____kilowatts into the power system of Licensee and as per conditions of this agreement and JKSERC (Grid Interactive Rooftop Solar Photo Voltaic Systems based on Net Metering) Regulations, 2015, issued by the Jammu and Kashmir State Electricity Regulatory Commission.Both the parties hereby agree to as follows :-1. Eligibility. - 1.1 Eligibility for net metering has been specified in the relevant regulations of the Jammu and Kashmir State Electricity Regulatory Commission. Eligible Consumer has to meet the standards and conditions for being integrated into grid/distribution system.
2. Technical and Interconnection Requirements. - 2.1 The Eligible Consumer agrees that his solar generation plant and net metering system will conform to the standards and requirements specified in JKSERC (Grid Interactive Rooftop Solar Photo Voltaic Systems based on Net Metering) Regulations, 2015 and in the following regulations and codes as amended from time to time :-
i. CEA's (Technical Standards for connectivity of the Distributed Generating Resources) Regulations, 2013 ;ii. Central Electricity Authority (Installation and Operation of Meters) Regulation, 2006 ;iii. JKSERC Electricity Regulatory Supply Code 2011.3. Clearances and Approvals. - 3.1 The Eligible Consumer shall obtain all the necessary approvals and clearances (environmental and grid connection related) before connecting the photovoltaic system to the distribution system.
4. Access and Disconnection. - 4.1 Licensee shall have access to metering equipment and disconnecting means of the solar photovoltaic system, both automatic and manual, at all times.
5. Liabilities. - 5.1 Eligible Consumer and Licensee shall indemnify each other for damages or adverse effects from either party's negligence or intentional misconduct in the connection and operation of photovoltaic system or Licensee's distribution system.
6. Commercial Settlement. - 6.1 All the commercial settlement under this agreement shall follow the Net Metering Regulations, 2015 issued by JKSERC.
7. Connection Costs. - 7.1 The Eligible Consumer shall bear all costs related to setting up of photovoltaic system including metering and interconnection costs. The Eligible Consumer agrees to pay the actual cost of modifications and upgrades to the service line required to connect photovoltaic system to the grid in case it is required.
8. Termination. - 8.1 The Eligible Consumer can terminate agreement at any time by providing Licensee with 30 days prior notice.
| Eligible Consumer | Distribution Licensee |
| Name | Name |
| Address | Designation |
| Service Connection No./Consumer ID | Office Address |
| Parameter | Reference | Requirement | |
| 1 | 2 | 3 | |
| Overall conditionsof service | State Distribution/Supply Code | Compliance with the terms and conditions ofsupply. | |
| Overall GridStandards | (i) Central Electricity Authority(GridStandard) Regulations,2010; | Compliance with Grid Standards as regards thefrequency, voltage and protection coordination. | |
| (ii) JKSERC Grid Code ; and | |||
| (iii) JKSERC (Distribution PerformanceStandards) Regulations, 2006. | |||
| Meters | Central ElectricityAuthority (Installationand Operationof Meters) Regulation, 2006as amended fromtime to time | Compliance with the specifications of themeters. | |
| Safety and supply | Central ElectricityAuthority (Measured ofSafety andElectricity Supply) Regulations, 2010 | Compliance with safety provisions forelectrical installations and apparatus. | |
| Harmonic Requirements Harmonic Current | IEEE 519 CEA (Technical Standards forConnectivity of the Distributed GenerationResources)Regulation,2013 | The Total Harmonic Distortion (THD) for voltageat the interconnection point should be not exceed 5% For thecurrent distortion limits, the Total Demand Distortion (TDD) interms of ratio of available short circuit current to the demandcurrent (ISL/IL) should remain within limit specified forvarious harmonics for different TDD values. | |
| Synchronization | CEA (Technical Standards for Connectivity ofthe Distributed Generation Resources) Regulation, 2013 | Photovoltaic system must be equipped with agrid frequency synchronization device. Every time the generatingstation is synchronized to the electricity system, it shall notcause voltage fluctuation greater than +/-5% at point of interconnection. | |
| Voltage | CEA (Technical Standards for Connectivity ofthe Distributed Generation Resources)Regulations, 2013 | The voltage operating window should minimizenuisance tripping and should be within operating range of 80% to110 of the nominal connected voltage. The photovoltaic systemmust isolate itself from the grid within a clearing time of 2seconds. | |
| Flicker | CEA (Technical Standards for Connectivity ofthe Distributed Generation Resources) Regulation, 2013 | Operation of Photovoltaic system should notcause voltage flicker in excess of the limits stated in IEC61000 standards as follows:- | |
| Short-term flicker (Pst) : The flicker severityevaluated over a short period of time (10 minutes) should be<=1. | |||
| Long-term flicker (Plt) : The flicker severityevaluated over a long period of time (typically 2 hours) shouldbe <=0.65. | |||
| Frequency | CEA (Technical Standards for Connectivity ofthe Distributed Generation Resources) Regulation, 2013 side and47.5 Hz on lower side). | There should be over and under frequency tripfunctions with a clearing time of 0.2 seconds, when theDistribution system frequency deviates outside the specifiedconditions (50.5 Hz on upper | |
| DC Injection | CEA (Technical Standards for Connectivity ofthe Distributed Generation Resources) Regulations, 2013 | Photovoltaic system should not inject DC powermore than 0.5% of full rated output at the interconnection pointor 1% of rated inverter output current into distribution systemunder my operating conditions. | |
| Power Factor | CEA (Technical Standards for Connectivity ofthe Distributed Generation Resources) Regulations, 2013 | When the output of the inverter is greater than50%, the power output from the inverter shall have a laggingpower factor of greater than 0.9. | |
| Islanding and Disconnection | CEA (Technical Standards for Connectivity ofthe Distributed Generation Resources) Regulations,2013 | The photovoltaic system must island/disconnectitself within IEC standard stipulated time in the event offault, voltage or frequency variations. | |
| Overload and Overheat | CEA (Technical Standards for Connectivity ofthe Distributed Generation Resources) Regulations, 2013 | The inverter should have the facility toautomatically switch off in case of overload or overheating andshould restart when normal conditions are restored. | |
| Paralleling Device | CEA (Technical Standards for Connectivity ofthe Distributed Generation Resources) Regulations, 2013 | Paralleling device of photovoltaic system shallbe capable of withstanding 220% of the normal voltage at theinterconnection point. |
| S. No. | Technical Parameters | Connectivity at 415 V and below voltage level | Connectivity at above415 V voltage level | ||
| Whole current meters | CT operated | CT-PT Operated | |||
| 1 | 2 | 3 | 4 | 5 | |
| 1. | Applicability | Solar plant capacity upto 4 k w | Solar plant capacity above4 k W and up to 15k W | Solar Plant Capacity above15 k W and up to100 k W | HT/EHV supply |
| 2. | Number of phases and wires | Single Phase, 2 Wire | Three Phase, 4 Wire | Three Phase, 4 Wire | Three Phase, 4 Wire |
| 3. | Measurand(s) | kWh | kWh | kWh, kVAh, kVA, PF | kWh, kVAh, kVA, PF, Max. demand |
| 4. | Standard Voltage and frequency | 240 V | 3x240 V (P-N), 415 V(P-P) 50+5% | 3x240 V (P-N), 415 V(p-P) 50+5% | 3x63.5 V (P-N), 110 V(P-P) 50+5% |
| 5. | Current Rating | 10-60 | 10-60 | 1 Amp | 1 Amp |
| 6. | Accuracy Class | 1.0 | 1.0 | 0.5S | 0.5S |
| 7. | Indian Standard or IECto which conforming | IS 13779-1999 | IS 13779-1999 | IS 14697, IS 13779 | IS 14697, IS 13779 |
| 8. | Import-export feature | Forward import | Forward import | Forward import | Forward import |
| 9. | Communication Port/Protocol | Optical/DLMS | Optical, RS-232/ DLMS | Optical, RS-232/ DLMS | RS-232/ DLMS |
| S. No. | Technical Parameters | Connectivity at 415 V and below voltage level | Connectivity at above 415 V voltage level | ||
| Whole current meters | CT operated | CT-PT Operated | |||
| 1 | 2 | 3 | 4 | 5 | |
| 1. | Applicability | Up to 5 kW connected load | Above 5 kW and up to15 kW connected load | Above 15kW and up to100 k W contract demand | HT/EHV supply |
| 2. | Number of phases and wires | Single Phase, 2 Wire | Three Phase, 4 Wire | Three Phase, 4 Wire | Three Phase, 4 Wire |
| 3. | Measurand(s) | kWh | kWh | kWh,kVAh, kVA, PF | kWh, kVAh, kVA, PF,Max. demand |
| 4. | Standard Voltage and frequency | 240 V | 3x240 V (P-N), 415 V(P-P) 50+5% | 3x240 V (P-N), 415 V(P-P) 50+5% | 3x63.5 V (P-N), 110 V(P-P) 50+5% |
| 5. | Current Rating | 10-60 | 10-60 | 1 Amp | 1 Amp |
| 6. | Accuracy Class | 1.0 | 1.0 | 0.5S | 0.5S |
| 7. | Indian Standard or IEC to which conforming | IS 13779-1999 | IS 13779-1999 | IS 14697, IS 13779 | IS 14697, IS 13779 |
| 8. | Import-export feature | Forward import | Forward import | Forward import | Forward import |
| 9. | Communication Port/Protocol | Optical/DLMS | Optical, RS-232/DLMS | Optical, RS-232/DLMS | Optical, RS-232/DLMS |