View source for Kolkata-class destroyer

{{Short description|Class of guided-missile destroyers}}
{{use Indian English|date=May 2014}}
{{Use dmy dates|date=May 2014}}
{{Good article}}

{|{{Infobox ship begin}}
{{Infobox ship image
| image = File:INS Kolkata steams alongside the guided-missile destroyer USS Sterett (DDG 104) during Malabar 2020 (cropped).jpg
| Ship caption = INS ''Kolkata'' at exercise Malabar, 2020.
}}
{{Infobox ship class overview
| Name = ''Kolkata'' class
| Builders = [[Mazagon Dock Limited]]
| Operators = {{navy|India}}
| Class before = {{sclass|Delhi|destroyer|4}}
| Class after = {{sclass|Visakhapatnam|destroyer|4}}
| Subclasses = 
| Cost = *{{INRConvert|11662|c|year=2014|lk=on}} for three ships (FY 2014)
*{{INRConvert|3887|c|year=2014|lk=on}} per ship (FY 2014)
| Built range = 2003–2015
| In service range = 
| In commission range = 2014–present
| Total ships building = 
| Total ships planned = 3
| Total ships completed = 3
| Total ships cancelled = 
| Total ships active = 3
| Total ships laid up = 
| Total ships lost = 
| Total ships retired = 
| Total ships preserved = 
}}
{{Infobox ship characteristics
| Hide header = 
| Header caption = 
| Ship class = 
| Ship type = [[Guided-missile destroyer]]
| Ship tonnage = 
| Ship displacement = {{convert|7400|t|abbr=on}} full load<ref name="hindujul14">{{cite news|title=Navy gets its largest destroyer|url=http://www.thehindu.com/news/national/navy-gets-its-largest-destroyer/article6205050.ece|date=13 July 2014|access-date=15 July 2014|work=The Hindu|url-status=live|archive-url=https://web.archive.org/web/20180303141734/http://www.thehindu.com/news/national/navy-gets-its-largest-destroyer/article6205050.ece|archive-date=3 March 2018|df=dmy-all}}</ref><ref name="INS Kolkata class">{{cite web|title=INS Kolkata|url=http://www.indiannavy.nic.in/naval-fleet/ins-kolkata|website=indiannavy.nic.in|publisher=Indian Navy|access-date=28 April 2015|url-status=dead|archive-url=https://web.archive.org/web/20150616202823/http://indiannavy.nic.in/naval-fleet/ins-kolkata|archive-date=16 June 2015|df=dmy-all}}</ref><ref>{{cite AV media|url=https://www.youtube.com/watch?v=s5MkSmXxRXU |archive-url=https://ghostarchive.org/varchive/youtube/20211212/s5MkSmXxRXU| archive-date=2021-12-12 |url-status=live|title=INS Kolkata: embarquement immédiat|publisher=l'express|access-date=2 September 2016}}{{cbignore}}</ref>
| Ship length = {{convert|163|m|ftin|abbr=on}}
| Ship beam = {{convert|17.4|m|ftin|abbr=on}}
| Ship draught = {{convert|6.5|m|ftin|abbr=on}}
| Ship power = 
| Ship propulsion = * [[Combined gas and gas]] system: 4 × [[Zorya-Mashproekt]] [https://www.linquip.com/device/4048/marine-gas-turbine-ugt16000r-dt59 DT-59 reversible gas turbines] producing 16.55MW each<ref>{{cite news|last1=Siddiqui|first1=Huma|title=INS Kochi turbocharged|url=http://www.financialexpress.com/industry/technology/ins-kochi-turbocharged/145742/|work=The Financial Express|date=5 October 2015|url-status=live|archive-url=https://web.archive.org/web/20180204123920/http://www.financialexpress.com/industry/technology/ins-kochi-turbocharged/145742/|archive-date=4 February 2018|df=dmy-all}}</ref><ref name="jni-18aug14">{{cite news|last1=Bedi|first1=Rahul|title=India commissions first-of-class destroyer Kolkata|url=http://www.janes.com/article/42106/india-commissions-first-of-class-destroyer-kolkata|work=IHS Jane's Navy International|date=18 August 2014|archive-url=https://web.archive.org/web/20140821013002/http://www.janes.com/article/42106/india-commissions-first-of-class-destroyer-kolkata|archive-date=21 August 2014}}</ref>
| Ship speed = {{convert|30|kn|km/h|lk=in}}
| Ship range = {{convert|6000|nmi|km|abbr=on|lk=in}} at {{convert|18|kn|km/h|abbr=on}}
| Ship endurance = 
| Ship test depth = 
| Ship boats = 
| Ship capacity = 
| Ship troops = 
| Ship complement =
300 (50 officers + 250 sailors)
| Ship sensors = *'''Radar :-'''
*[[Israeli Aircraft Industries|IAI]] [[EL/M-2248 MF-STAR]] [[S-band]] [[Active Electronically Scanned Array|AESA]] multi-function radar<ref name=sp8j14>{{cite news|title=Country's most potent indigenous warship joins service this month|url=http://spsnavalforces.com/exclusive/?id=18&h=Country-s-most-potent-indigenous-warship-joins-service-this-month|access-date=8 June 2014|publisher=SP's Naval Forces|date=8 June 2014|url-status=live|archive-url=https://web.archive.org/web/20160821171744/http://spsnavalforces.com/exclusive/?id=18&h=Country-s-most-potent-indigenous-warship-joins-service-this-month|archive-date=21 August 2016|df=dmy-all}}</ref>
* [[Thales Group|Thales]] LW-08 D-band air search radar<ref>{{cite web |url=http://www.thalesgroup.com/Press_Releases/naval_Press_Release_Bharat_Electronics_awards_LW08/ |title=Bharat Electronics Ltd. awards LW08 contract to Thales |publisher=Thalesgroup.com |date=2 July 2008 |access-date=2 April 2010 |url-status=live |archive-url=https://web.archive.org/web/20110727113416/http://www.thalesgroup.com/Press_Releases/naval_Press_Release_Bharat_Electronics_awards_LW08/ |archive-date=27 July 2011 |df=dmy-all }}</ref>
* Garpun Bal (3TS-25E) radar <ref>{{Cite web|url=https://www.youtube.com/watch?v=MvWia6Jpwek&t=153s&ab_channel=IndianNavy|title=Virtual tour of INS Kolkata (Hindi)|website=[[YouTube]]}}</ref>
*'''Sonar :-'''
* [[Bharat Electronics Limited|BEL]] HUMSA-NG bow sonar
* [[Bharat Electronics Limited|BEL]] Nagin active towed array sonar<ref>{{Cite web |title=Kolkata Class Destroyer INS Chennai will be commissioned on Monday |url=https://www.indiatoday.in/india/story/kolkata-class-destroyer-ins-chennai-manohar-parikkar-352990-2016-11-20 |access-date=2022-09-24 |website=India Today |language=en}}</ref>
*'''Combat Suite :-'''
* [[Bharat Electronics Limited|BEL]] EMCCA Mk4 combat management system<ref name=sp8j14/>
| Ship EW = * [[Bharat Electronics Limited|BEL]] Ellora [[electronic support measures]]<ref name="ndtv-29sep15">{{cite web|last1=Som|first1=Vishnu|title=Inside India's New and Deadliest Warship|url=https://www.ndtv.com/india-news/inside-indias-new-and-deadliest-warship-1224090|website=NDTV|access-date=23 November 2017|date=29 September 2015|url-status=live|archive-url=https://web.archive.org/web/20170718032359/http://www.ndtv.com/india-news/inside-indias-new-and-deadliest-warship-1224090|archive-date=18 July 2017|df=dmy-all}}</ref>
*'''Decoys :-'''
*4 × [[Kavach (anti-missile system)|Kavach]] decoy launchers
*2 × [[Maareech ATDS|Maareech]] [[Torpedo defence|torpedo-countermeasure]] systems<ref name="ndtv-29sep15"/>
| Ship armament = *'''Anti-air warfare :-'''
*4 × 8-cell [[Vertical launching system|VLS]], for a total of 32 [[Barak 8]] [[surface-to-air missile]]s
*'''Anti-surface warfare :-'''
*2 × 8-cell VLS, for 16 [[BrahMos]] [[anti-ship missile]]s 
*'''Anti-submarine warfare :-'''
*4 × {{cvt|533|mm|in|0}} [[torpedo tube]]s 
*2 × [[RBU-6000]] [[Anti-submarine weapon|anti-submarine rocket launchers]]
*'''Guns :-'''
*1 × [[OTO Melara 76 mm]] [[Naval artillery|naval gun]]
*4 x [[AK-630]] [[Close-in weapon system|CIWS]]
| Ship armour = 
| Ship armor = 
| Ship aircraft = 2 × [[Westland Sea King|Sea King]] or [[HAL Dhruv]] helicopters
| Ship aircraft facilities = Dual Enclosed [[hangar]]
| Ship notes = 
}}
|}

The '''''Kolkata-''class destroyers''', also known '''Project 15A''' or '''Project 15 ''Alpha''''', are a class of [[Stealth technology|stealth]] [[guided-missile destroyer]]s constructed for the [[Indian Navy]]. The class comprises three ships – ''Kolkata'', ''Kochi'' and ''Chennai'', all of which were built by [[Mazagon Dock Limited]] (MDL) in [[India]], and are the largest destroyers to be operated by the Indian Navy. Due to delays in construction and [[sea trial]]s, the initial [[Ship commissioning|commissioning]] date of the first ship of the class was pushed back from 2010 to 2014.<ref name=it10j13>{{cite news|title=Navy's ongoing hunt for heavy torpedoes leads to delay in modernisation process|url=http://indiatoday.intoday.in/story/indian-navy-hits-modernisation-crisis-no-weapons-tarpedoes/1/279309.html|access-date=20 July 2013|newspaper=India Today|date=10 June 2013|url-status=live|archive-url=https://web.archive.org/web/20130717085017/http://indiatoday.intoday.in/story/indian-navy-hits-modernisation-crisis-no-weapons-tarpedoes/1/279309.html|archive-date=17 July 2013|df=dmy-all}}</ref><ref name=FinalCommish>{{cite press release |url=https://www.indiannavy.nic.in/content/guided-missile-destroyer-ins-chennai-joins-indian-navy |title=Guided Missile Destroyer INS Chennai Joins the Indian Navy |publisher=Indian Navy |date=21 November 2016 |access-date=21 November 2016 |url-status=live |archive-url=https://web.archive.org/web/20161121234037/https://www.indiannavy.nic.in/content/guided-missile-destroyer-ins-chennai-joins-indian-navy |archive-date=21 November 2016 |df=dmy-all }}</ref>

The destroyers are a follow-on of the Project 15 {{sclass|Delhi|destroyer|2}}<nowiki/>s, but are considerably more capable due to major improvements in the design, the addition of substantial land-attack capabilities, the fitting-out of modern sensors and weapons systems, and the expanded use of net-centric capability such as [[Cooperative Engagement Capability]].<ref>{{cite book|author1=Toshi Yoshihara|author2=James Holmes|title=Strategy in the second nuclear age : power, ambition, and the ultimate weapon|year=2012|publisher=Georgetown University Press|location=Washington, DC|isbn=978-1589019287|page=143|url=https://books.google.com/books?id=hpFJflNJJmsC&q=kolkata+class+destroyer&pg=PA143|editor=James R. Holmes|url-status=live|archive-url=https://web.archive.org/web/20180303201920/https://books.google.com/books?id=hpFJflNJJmsC&pg=PA143&dq=kolkata+class+destroyer&hl=en&sa=X&ei=RrrsUco_zuKsB5PpgSA&redir_esc=y#v=onepage&q=kolkata%20class%20destroyer&f=false|archive-date=3 March 2018|df=dmy-all}}</ref><ref name="pib.nic.in">{{Cite web|url=http://pib.nic.in/PressReleseDetail.aspx?PRID=1572157&RegID=3&LID=1|title = Press Information Bureau}}</ref><ref>{{Cite web|url=https://defense-update.com/20190517_indian-navy-demonstrates-mrsam-cooperative-engagement-capability.html|title=Indian Navy Demonstrates 'MRSAM 'Cooperative Engagement' Capability|date=17 May 2019|access-date=18 September 2019|archive-date=10 July 2019|archive-url=https://web.archive.org/web/20190710034739/https://defense-update.com/20190517_indian-navy-demonstrates-mrsam-cooperative-engagement-capability.html|url-status=live}}</ref><ref>{{Cite web |url=https://www.navalnews.com/naval-news/2019/05/indian-navy-completes-mrsam-first-cooperative-engagement-firing-test/ |title=Indian Navy completes MRSAM first cooperative engagement firing test – Naval News<!-- Bot generated title --> |date=20 May 2019 |access-date=18 September 2019 |archive-date=21 September 2019 |archive-url=https://web.archive.org/web/20190921205133/https://www.navalnews.com/naval-news/2019/05/indian-navy-completes-mrsam-first-cooperative-engagement-firing-test/ |url-status=live }}</ref><ref>{{Cite web|url=https://www.janes.com/article/88673/indian-navy-demonstrates-co-operative-engagement-firing-capability|title=Janes &#124; Latest defence and security news|access-date=18 September 2019|archive-date=21 September 2019|archive-url=https://web.archive.org/web/20190921205135/https://www.janes.com/article/88673/indian-navy-demonstrates-co-operative-engagement-firing-capability|url-status=live}}</ref>

== Design ==
The ''Kolkata'' class share similar dimensions to the previous ''Delhi'' class, however they have 2,363 modifications which include major upgrades in weaponry, sensors and helicopter systems.<ref name=ajrn20a12>{{cite news|last1=Shukla|first1=Ajai|title=Dangerous consequences of warships built in India|url=http://www.rediff.com/news/report/dangerous-consequences-of-warships-built-in-india/20120820.htm|access-date=9 June 2014|publisher=Rediff News|date=20 August 2012|url-status=live|archive-url=https://web.archive.org/web/20140714172551/http://www.rediff.com/news/report/dangerous-consequences-of-warships-built-in-india/20120820.htm|archive-date=14 July 2014|df=dmy-all}}</ref> With a standard displacement of {{convert|6800|t|abbr=on}} and a full-load displacement of {{convert|7400|t|abbr=on}}, they are the largest destroyers ever operated by the Indian Navy.<ref name="INS Kolkata class"/> Some media reports have even given a full-load displacement of {{convert|7500|t|abbr=on}}.<ref name="hindujul14" /> These are the first stealth destroyers built by India and marked a significant development in India's shipbuilding technology. The ships incorporate modern weapons and sensors, and have an advanced [[information warfare]] suite, an auxiliary control system with a sophisticated power distribution architecture, and modular crew quarters.<ref name=zn1a>{{cite news|title=INS Chennai adds to Naval might|url=http://zeenews.india.com/news/nation/ins-chennai-adds-to-naval-might_615908.html|access-date=16 June 2013|newspaper=Zee News|date=1 April 2010|url-status=live|archive-url=https://web.archive.org/web/20140605053002/http://zeenews.india.com/news/nation/ins-chennai-adds-to-naval-might_615908.html|archive-date=5 June 2014|df=dmy-all}}</ref>

The class have a length of {{convert|163|m|ftin|abbr=on}}, a [[Beam (nautical)|beam]] of {{convert|17.4|m|ftin|abbr=on}} and a [[Draft (hull)|draught]] of {{convert|6.5|m|ftin|abbr=on}}. The ship's power and propulsion features a [[combined gas and gas]] system utilizing four DT-59 reversible gas turbines. This configuration allows the ship to reach speeds in excess of {{convert|30|kn|lk=in}}.<ref name=pib>{{cite web|title=Project 15-A destroyer, INS Kochi To be launched on 18 Sep 2009|url=http://www.pib.nic.in/newsite/erelease.aspx?relid=52673|publisher=PIB|access-date=16 June 2013|url-status=live|archive-url=https://web.archive.org/web/20120721225918/http://www.pib.nic.in/newsite/erelease.aspx?relid=52673|archive-date=21 July 2012|df=dmy-all}}</ref> Aviation facilities include a large [[flight deck]], which was re-designed to handle larger helicopters than the ''Delhi'' class, and an enclosed hangar for up to two maritime helicopters.<ref name=ajrn20a12/>
[[File:ELM 2248 MF-STAR radar onboard INS Kolkata (D63) of the Indian Navy.png|thumbnail|left|The [[EL/M-2248 MF-STAR]] AESA is the primary radar of the ''Kolkata'' class]]

The primary radar sensor of the class is the [[EL/M-2248 MF-STAR]] multi-mission [[Active electronically scanned array|AESA]].<ref name=sp8j14/> It is also equipped with [[Thales Nederland#Sensors|Thales LW-08]] long range volume search [[radar]].

The ship's main air-defence armament is composed of four eight-cell [[vertical launching system]]s (VLS) allowing for up to thirty-two  [[Barak 8]] / MRSAM air defence missiles.<ref name=NDTVKolkata>{{cite news|last1=Som|first1=Vishnu|title=On INS Kolkata, PM is Only Partially Correct|url=http://www.ndtv.com/opinion/on-ins-kolkata-pm-is-only-partially-correct-654566|access-date=8 March 2015|agency=NDTV|date=16 August 2014|quote=At the moment, she is designed to carry only 32 Barak surface-to-air missiles...|url-status=live|archive-url=https://web.archive.org/web/20160608020247/http://www.ndtv.com/opinion/on-ins-kolkata-pm-is-only-partially-correct-654566|archive-date=8 June 2016|df=dmy-all}}</ref>

The class is designed for [[network-centric warfare]] such as [[Cooperative Engagement Capability]], where they operate wide-area air defense, distributing assets and control over different platforms and locations, and harnessing multiple sensors & effectors into a single air defense system. In May 2019, 2 ships of the class conducted the maiden cooperative engagement firing of the  Barak 8 / MRSAM by using the Joint Taskforce Coordination (JTC) mode to intercept several simultaneous aerial targets involving two complex scenarios at extended ranges. With it, the [[Indian Navy]] became the second naval service in the world after the United States, and the first in Asia to have developed and deployed it. The capability is to be rolled out on all future major warships of the Indian Navy.<ref name="pib.nic.in"/>

Four [[AK-630]] [[Close-in weapon system|CIWS]]s are fitted for close-in defence.

The supersonic [[BrahMos]] anti-ship and land-attack missiles are the primary offensive armament of the ''Kolkata'' class.<ref name=it5m08>{{cite news|title=First test of BrahMos land-attack variant from the sea|url=http://brahmos.com/newscenter.php?newsid=60#|access-date=17 July 2013|newspaper=India today|date=5 March 2008|url-status=dead|archive-url=https://web.archive.org/web/20131105033616/http://brahmos.com/newscenter.php?newsid=60|archive-date=5 November 2013|df=dmy-all}}</ref> The BrahMos missiles are fitted into a 16-cell Universal Vertical Launcher Module (UVLM) allowing one missile per launch silo, and all 16 missiles can be fired in [[salvo]].<ref>{{cite news|title=BrahMos missile test-fired from warship INS Kolkata|url=http://timesofindia.indiatimes.com/india/BrahMos-missile-test-fired-from-warship-INS-Kolkata/articleshow/36295940.cms|access-date=9 June 2014|work=The Times of India|date=9 June 2014|url-status=live|archive-url=https://web.archive.org/web/20140609160908/http://timesofindia.indiatimes.com/india/BrahMos-missile-test-fired-from-warship-INS-Kolkata/articleshow/36295940.cms|archive-date=9 June 2014|df=dmy-all}}</ref>

The class carries a {{convert|76|mm|abbr=on|0}} naval gun located forward of the bridge, which provides limited anti-shipping capability and anti-air capability in addition to its naval gun fire-support role for land-based operations.

A bow-mounted [[sonar]] HUMSA-NG (hull-mounted sonar array – new generation) is carried for sub-surface surveillance.

For [[anti-submarine warfare]], the ''Kolkata'' class are equipped with a torpedo launching system via four torpedo tubes and two [[RBU-6000]] anti-submarine rocket launchers.<ref>{{cite web|title=Project 15-A Improved Delhi / VIshakhapattanam / DDGHM Kolkata|url=http://www.globalsecurity.org/military/world/india/d-project-15a.htm|publisher=Global Security|access-date=16 June 2013|url-status=live|archive-url=https://web.archive.org/web/20130404170816/http://www.globalsecurity.org/military/world/india/d-project-15a.htm|archive-date=4 April 2013|df=dmy-all}}</ref>

[[Bharat Electronics Limited|BEL]]'s Electronic Modular Command & Control Applications (EMCCA) Mk4 provides combat management.<ref name=sp8j14/>

Forty [[lakh]] (four million) lines of codes have been written to develop the advanced combat management system onboard [[INS Kochi|INS ''Kochi'']]. The system is designed so that all the data about the surrounding threat comes in one place, along with analysis of the kind of threat. The system also advises the commanding officer about the kind of weaponry he should use to tackle the threat in real time.<ref>{{cite web|title=INS Kochi is proof India good at integrating different systems on one platform|url=http://www.sundayguardianlive.com/news/1201-%E2%80%98ins-kochi-proof-india-good-integrating-different-systems-one-platform%E2%80%99|publisher=sunday guardian|access-date=3 October 2015|url-status=dead|archive-url=https://web.archive.org/web/20151009065100/http://www.sundayguardianlive.com/news/1201-%E2%80%98ins-kochi-proof-india-good-integrating-different-systems-one-platform%E2%80%99|archive-date=9 October 2015|df=dmy-all}}</ref> The ship is equipped with sophisticated digital networks, such as Asynchronous Transfer Mode based Integrated Ship Data Network (AISDN), Combat Management System (CMS), Automatic Power Management System (APMS) and Auxiliary Control System (ACS). The AISDN is the information highway on which data from all the sensors and weapon ride. The CMS is used to integrate information from other platforms using an indigenous data-link system to provide Maritime Domain Awareness. The intricate power supply management is done using APMS, and remote control and monitoring of machinery is achieved through the ACS.<ref name=":1">{{Cite web|url=http://indiannavy.nic.in/content/ins-kochi-commissioned-mumbai|title=INS Kochi commissioned at Mumbai {{!}} Indian Navy|website=indiannavy.nic.in|access-date=2016-05-05|url-status=live|archive-url=https://web.archive.org/web/20160603075634/http://indiannavy.nic.in/content/ins-kochi-commissioned-mumbai|archive-date=3 June 2016|df=dmy-all}}</ref>

==Development==
{{See also|Delhi-class destroyer}}

In 1986, the Cabinet Committee on Political Affairs (CCPA) approved a follow-on class of the earlier Project 15 [[Delhi-class destroyer|''Delhi''-class]] destroyers. The aim was that the follow-on class would incorporate a higher level of air-defence, land attack, anti-submarine, and anti-ship capabilities than the preceding class. However, the Indian Navy did not initially take up the option.<ref name="Kolkata-class destroyer">[http://www.globalsecurity.org/military/world/india/d-project-15a.htm Kolkata-class destroyer] {{webarchive|url=https://web.archive.org/web/20130404170816/http://www.globalsecurity.org/military/world/india/d-project-15a.htm |date=4 April 2013 }} GlobalSecurity.org</ref> By the year 2000, the Indian Navy had redesigned the follow-on ''Kolkata'' class to incorporate even higher levels of technology (including modern stealth characteristics) and in May of that year, approval for the construction was given. The concept and function for Project 15A was framed by the navy's Directorate of Naval Design, while the detailed design was developed by Mazagon Dock Limited (MDL).<ref name="bs-20080415">{{cite news|last=Shukla|first=Ajai|url=http://www.business-standard.com/article/companies/world-class-warships-at-indian-prices-108041501011_1.html|title=World-class warships at Indian prices|work=Business Standard|date=15 April 2008|access-date=2 April 2010|url-status=live|archive-url=https://web.archive.org/web/20140514070556/http://www.business-standard.com/article/companies/world-class-warships-at-indian-prices-108041501011_1.html|archive-date=14 May 2014|df=dmy-all}}</ref><ref>{{cite web|last=Bhatt|first=Arunkumar|url=http://www.thehindu.com/2003/09/27/stories/2003092702901200.htm|title=Mazagon Dock lays keel of destroyer|date=27 September 2003|access-date=2 April 2010|url-status=dead|archive-url=https://web.archive.org/web/20180303201920/http://www.thehindu.com/2003/09/27/stories/2003092702901200.htm|archive-date=3 March 2018|work=[[The Hindu]]|df=dmy-all}}</ref><ref>{{cite web |url=http://www.mdlindia.com/annual_report/Directors%20Report%202005-06_231106.pdf |title=Mazagon Dock Annual Report |publisher=Mdlindia.com |access-date=2 April 2010 |url-status=dead |archive-url=https://web.archive.org/web/20071201121203/http://www.mdlindia.com/annual_report/Directors%20Report%202005-06_231106.pdf |archive-date=1 December 2007 |df=dmy-all }}</ref>

Initially in 2008, the total program cost with long-term spare parts was expected to cost {{INRConvert|3800|c}},<ref name="bs-20080415"/> but the construction costs escalated about 225%, and by 2011, cost of the program became {{INRConvert|11662|c}}, with each ship costing {{INRConvert|3900|c}}.<ref>{{cite web |author=Ajai Shukla |url=http://ajaishukla.blogspot.in/2014/05/ins-kolkata-navys-most-powerful-warship.html |title=INS Kolkata, navy's most powerful warship, to be delivered next month |publisher=Business-standard |date=2 May 2014 |access-date=23 July 2014 |url-status=live |archive-url=https://web.archive.org/web/20140808102800/http://ajaishukla.blogspot.in/2014/05/ins-kolkata-navys-most-powerful-warship.html |archive-date=8 August 2014 |df=dmy-all }}</ref> The [[Minister of Defence (India)|Defense Minister]] [[A. K. Antony]] cited the causes being the delay in supply of [[ABS Steels|warship-grade steel]] by Russia, increase in costs of Russian specialists due to inflation during the build period, wage revision due from October 2003 and delay in finalisation of cost of weapons and sensors.<ref name=stp5s11>{{cite news|title=Indian warships' costs escalate over 225%|url=http://www.stratpost.com/indian-warships-costs-escalate-over-225|access-date=20 July 2013|newspaper=StratPost|date=5 September 2011|url-status=live|archive-url=https://web.archive.org/web/20140514102331/http://www.stratpost.com/indian-warships-costs-escalate-over-225|archive-date=14 May 2014|df=dmy-all}}</ref><ref name=pib3a11>{{cite news|title=Delay in Indigenous Warship Projects of Navy|url=http://pib.nic.in/newsite/PrintRelease.aspx?relid=73820|access-date=23 July 2013|newspaper=Press Information Bureau|date=3 August 2011|url-status=live|archive-url=https://web.archive.org/web/20140514090530/http://pib.nic.in/newsite/PrintRelease.aspx?relid=73820|archive-date=14 May 2014|df=dmy-all}}</ref> A [[Comptroller and Auditor General of India]] report published in 2010 blamed the [[Indian Navy|Navy]] for delays, criticising the late decisions for replacement of surface to air missile system with Barak, change of gun mount, inclusion of a sonar dome and modification of helicopter hangar to accommodate [[HAL Dhruv]].<ref name=ajrn20a12/><ref>{{cite web|title=Report No. 32 of 2010 – Performance Audit of Indigenous Construction of Indian Naval Warships|url=http://cag.gov.in/sites/default/files/audit_report_files/Union_Performance_Defence_Indigenous_Construction_Naval_Warships_32_2010.pdf|publisher=Comptroller and Auditor General of India|page=41|url-status=live|archive-url=https://web.archive.org/web/20180204124000/http://cag.gov.in/sites/default/files/audit_report_files/Union_Performance_Defence_Indigenous_Construction_Naval_Warships_32_2010.pdf|archive-date=4 February 2018|df=dmy-all}}</ref>

===Construction===
Construction of three ''Kolkata''-class ships was sanctioned by the [[Government of India]] in May 2000, and steel for the lead ship was cut in March 2003. Construction began in September 2003 at Mazagon Docks, Mumbai, with an initial expectation that the first of the class would be handed over to the navy by 2010. However, since then the ''Kolkata'' class has suffered consecutive delays, slow construction procedures, and technical problems, which saw the first ship of the class enter service during mid-2014. The delays in the construction programme have been attributed to persistent design changes made by the Indian Navy to incorporate new weapons systems and sensors, failure by a [[Ukraine|Ukrainian]] shipyard to deliver the ship's propellers and shafts, and the contract later being awarded to a [[Russia]]n firm,<ref name=bs-20090401>{{cite news|last=Shukla|first=Ajai|url=http://www.business-standard.com/india/news/russia-steps-in-to-bail-out-sinking-project-15-a/353555/|title=Russia steps in to bail out sinking Project 15-A|newspaper=Business Standard India|publisher=Business Standard|date=1 April 2009|access-date=2 April 2010|url-status=live|archive-url=https://web.archive.org/web/20100922101241/http://www.business-standard.com/india/news/russia-steps-in-to-bail-out-sinking-project-15-a/353555/|archive-date=22 September 2010|df=dmy-all}}</ref> and finally the delay in the delivery of the Barak 8 anti-air missiles.<ref>{{cite news|last=Shukla|first=Ajai|url=http://www.business-standard.com/article/economy-policy/navy-s-wavering-delaying-warships-by-years-112082002026_1.html|title=Navy's wavering delaying warships by years|newspaper=Business Standard India|publisher=Business Standard|date=20 August 2012|access-date=20 August 2012|url-status=live|archive-url=https://web.archive.org/web/20130413155232/http://www.business-standard.com/article/economy-policy/navy-s-wavering-delaying-warships-by-years-112082002026_1.html|archive-date=13 April 2013|df=dmy-all}}</ref>

The ''Kolkata'' class are the largest destroyers ever to be constructed at Mazagon Docks.<ref name="ibnl1a10">{{cite news|title=India's 3rd indigenous naval destroyer launched|url=http://www.news18.com/news/india/antony-navy-destroyer-antony-on-navy-335869.html|access-date=20 July 2013|work=CNN-News18|date=1 April 2010|url-status=live|archive-url=https://web.archive.org/web/20180203181733/http://www.news18.com/news/india/antony-navy-destroyer-antony-on-navy-335869.html|archive-date=3 February 2018|df=dmy-all}}</ref> Technical problems were found during the sea trials of the lead ship ''Kolkata'', which delayed the project by six months to early 2014.<ref name=it10j13 />

==Ships of the class==
{|class="wikitable"
|-
!Name
!Pennant
!Yard No.
!Builder
!Laid Down
!Launched
!Commissioned
!Status
|-
| {{INS|Kolkata|D63|2}}
| D63
| 701<ref name=":0">{{Cite web|url=http://www.mazagondock.gov.in/newsite2010/pdf_doc/Annual_Reports/Annual_Report_English_2014-2015.pdf|title=Annual Report 2014–2015|website=mazagondock.in|publisher=Mazagon Dock Shipbuilders Limited|archive-url=https://web.archive.org/web/20160805110656/http://www.mazagondock.gov.in/newsite2010/pdf_doc/Annual_Reports/Annual_Report_English_2014-2015.pdf|archive-date=5 August 2016}}</ref>
| rowspan=3|Mazagon Dock Limited
| 26 September 2003<ref>{{cite news |last1=Bhatt |first1=Arunkumar |title=Mazagon Dock lays keel of destroyer |url=http://www.thehindu.com/2003/09/27/stories/2003092702901200.htm |archive-url=https://web.archive.org/web/20180303201920/http://www.thehindu.com/2003/09/27/stories/2003092702901200.htm |url-status=dead |archive-date=3 March 2018 |work=[[The Hindu]] |date=27 September 2003}}</ref>
| 30 March 2006<ref>{{cite news|last1=Rasquinha|first1=Reagan Gavin|title=Queen of the high seas|url=https://timesofindia.indiatimes.com/bombay-times/Queen-of-the-high-seas/articleshow/1473297.cms|work=The Times of India|date=1 April 2006|access-date=2 April 2010|url-status=live|archive-url=https://web.archive.org/web/20121110154527/http://timesofindia.indiatimes.com/bombay-times/Queen-of-the-high-seas/articleshow/1473297.cms|archive-date=10 November 2012|df=dmy-all}}</ref><ref>{{cite news|last=Bhatt|first=Arunkumar|url=http://www.thehindu.com/todays-paper/tp-national/a-lethal-combination-of-stealth-and-strength/article18429490.ece|title=A lethal combination of stealth and strength|work=The Hindu|date=1 April 2006|access-date=2 April 2010|url-status=live|archive-url=https://web.archive.org/web/20180303201921/http://www.thehindu.com/todays-paper/tp-national/a-lethal-combination-of-stealth-and-strength/article18429490.ece|archive-date=3 March 2018|df=dmy-all}}</ref>
| 16 August 2014<ref>{{cite news|last1=Pandit|first1=Rajat|title=PM Modi inducts India's largest indigenously built warship INS Kolkata|url=https://timesofindia.indiatimes.com/india/PM-Modi-inducts-Indias-largest-indigenously-built-warship-INS-Kolkata/articleshow/40313665.cms|work=The Times of India|date=16 August 2014|url-status=live|archive-url=https://web.archive.org/web/20180204003246/https://timesofindia.indiatimes.com/india/PM-Modi-inducts-Indias-largest-indigenously-built-warship-INS-Kolkata/articleshow/40313665.cms|archive-date=4 February 2018|df=dmy-all}}</ref>
| rowspan="3" | Active
|-
| {{INS|Kochi||2}}
| D64
| 702<ref name=":0" />
| 25 October 2005<ref name="hans-8oct15">{{cite news|last=Ved|first=Mahendra|title=Make in India at Indian Navy|url=http://www.thehansindia.com/posts/index/2015-10-08/Make-in-India-at-Indian-Navy-179739|work=The Hans India|date=8 October 2015|language=en|url-status=live|archive-url=https://web.archive.org/web/20180223051318/http://www.thehansindia.com/posts/index/2015-10-08/Make-in-India-at-Indian-Navy-179739|archive-date=23 February 2018|df=dmy-all}}</ref>
| 18 September 2009<ref name="hans-8oct15"/>
| 30 September 2015<ref>{{cite news|title=INS Kochi, largest India-made warship, commissioned|url=https://timesofindia.indiatimes.com/india/INS-Kochi-largest-India-made-warship-commissioned/articleshow/49162943.cms|work=The Times of India|agency=TNN|date=30 September 2015|url-status=live|archive-url=https://web.archive.org/web/20180204003221/https://timesofindia.indiatimes.com/india/INS-Kochi-largest-India-made-warship-commissioned/articleshow/49162943.cms|archive-date=4 February 2018|df=dmy-all}}</ref>
|-
| {{INS|Chennai||2}}
| D65
| 703<ref>{{cite web |title=Annual Report 2016–2017 |url=https://mazagondock.in/writereaddata/pdf_doc/Annual_Reports/Annual_Report_English_2016-2017.pdf |website=mazagondock.in |publisher=Mazagon Dock Shipbuilders Limited |access-date=28 May 2019 |page=14 |archive-date=13 July 2019 |archive-url=https://web.archive.org/web/20190713151617/http://www.mazagondock.in/writereaddata/pdf_doc/Annual_Reports/Annual_Report_English_2016-2017.pdf |url-status=live }}</ref>
| 21 February 2006<ref name="jfs-1617">{{cite book|editor1-last=Saunders|editor1-first=Stephen|editor1-mask=Commodore Stephen Saunders|title=Jane's Fighting Ships 2016–2017|date=2016|publisher=Jane's Information Group|location=Coulsdon|isbn=978-0710631855|page=346|edition=119th|chapter=India}}</ref>
| 1 April 2010<ref name="ibnl1a10"/>
| 21 November 2016<ref name=FinalCommish/>
|}

==Gallery==

{{Gallery
|width=160 | height=170
|File:IAC1 Vikrant (R11) with INS Kolkata (D63) during sea trial.jpg
 |{{INS|Kolkata|D63|2}} with [[INS Vikrant (2013)|Vikrant (R11)]] during sea trial
|File:INS Kolkata steams alongside the guided-missile destroyer USS Sterett (DDG 104) during Malabar 2020.jpg
 |{{INS|Kolkata||2}} alongside {{USS|Sterett|DDG 104|6}} during Exercise Malabar 2020.
|File:INS Chennai (D65) with JMSDF JS Kaga during JIMEX2020.jpg
 |{{INS|Chennai|D65|2}} with {{JS|Kaga||6}} during JIMEX 2020.
|File:INS Kolkata at Mombasa, Kenya.jpg
 |''INS Kolkata'' at [[Mombasa]], [[Kenya]].
|File:The Indian Navy destroyer INS Kolkata (D63) and the British Navy destroyer HMS Defender (D36) steam alongside the Ticonderoga-class guided-missile cruiser USS Antietam (CG 54) during an exercise.JPG
 |''INS Kolkata'' and {{HMS|Defender|D36|6}} during an exercise.
|File:INS Chennai (D65) with JS Ikazuchi during JIMEX2020.jpg
 |''INS Chennai'' with {{JS|Ikazuchi|DD-107|6}}. 
|File:INS Chennai steams alongside the USS Princeton (CG 59) in the North Arabian Sea during Malabar 2020.jpg
 |''INS Chennai'' during Malabar 2020.
|File:INS Chennai (D65) with JS Ikazuchi (DD-107) during JIMEX 2020.jpg
 |''INS Chennai'' and ''JS Ikazuchi'' during JIMEX 2020.
|File:INS Kochi 7th Anniversary Img1.jpg
 |''INS Kochi''.
}}

==See also==
* [[List of active Indian Navy ships]]
* [[List of naval ship classes in service]]
* [[Future of the Indian Navy]]
* [[Project 17A-class frigate]] – A planned frigate class of the Indian Navy.

==References==
{{reflist|30em}}

==External links==
{{commons category|Kolkata class destroyers}}
* [https://web.archive.org/web/20101227011444/http://bharat-rakshak.com/NAVY/Ships/Future/192-Project-15a.html ''Kolkata''-class destroyer – Bharat Rakshak]
* [http://www.freewebs.com/jeffhead/aegisvesselsoftheworld/kolkata.htm Aegis Vessels of the World – ''Kolkata''-class] – details on the specifications of the ship and recent images of INS ''Kolkata'' at sea.

* {{YouTube|ArgcNUD8xLQ|INS ''Kolkata''}}

{{Destroyers of the Indian Navy}}
{{Ship classes of the Indian Navy}}

{{DEFAULTSORT:Kolkata-class destroyer}}
[[Category:Kolkata-class destroyers| ]]
[[Category:Destroyers of the Indian Navy]]
[[Category:Destroyer classes]]
[[Category:Ships built in India]]