Assam-Nagaland Tripartite MoU: Oil Exploration in a Disputed Border Belt After Three Decades

Why in News?

On 11 June 2026, the Government of India, Assam and Nagaland signed a tripartite Memorandum of Understanding (MoU) in New Delhi clearing joint exploration and production of crude oil and natural gas in the disputed belt along the Assam-Nagaland border — the first framework of its kind for an inter-state disputed area.

The pact ends a freeze on hydrocarbon activity in the belt that has held since the mid-1990s, monetising a contested zone whose boundary case has been pending before the Supreme Court since 1988.

• Signatories: Union Petroleum and Natural Gas Minister Hardeep Singh Puri (Centre), CM Himanta Biswa Sarma (Assam), CM Neiphiu Rio (Nagaland); witnessed by Union Home Minister Amit Shah
• Coverage: more than 1,000 sq km along the disputed border, including six disputed oilfields
• Revenue formula: 50:50 sharing of hydrocarbon resources from the disputed areas between Assam and Nagaland
• Production projection: from about 1,000–1,500 barrels per day to more than ten times that level (Amit Shah, 11 June 2026)
• One oilfield alone holds recoverable hydrocarbons worth over ₹15,000 crore
• Boundary case untouched: Assam’s Original Suit No. 2 of 1988 under Article 131 stays pending before the Supreme Court

The development matters in the context of:

• Cooperative federalism and the Union acting as broker between two states
• Article 371A and Nagaland’s control over land and its resources
• Energy security and balanced development of the North-Eastern Region
• Inter-state boundary disputes and the limits of adjudication under Article 131

UPSC Relevance

Prelims Relevance

• Tripartite MoU signed 11 June 2026 in New Delhi; 50:50 sharing formula; 1,000+ sq km; six disputed oilfields
• Current production ~1,000–1,500 barrels/day; projected more than tenfold rise; one field worth over ₹15,000 crore
• Assam-Nagaland boundary is 512.1 km long, touching Golaghat, Jorhat, Sivasagar and Karbi Anglong districts
• Disputed Area Belt (DAB): six sectors (A to F) across reserved forests including Geleki, Abhoypur, Tiru Hills, Desoi Valley and Doyang; CRPF deployed as a neutral force since 1979
• Nagaland became India’s 16th state on 1 December 1963 under the State of Nagaland Act, 1962; boundary follows the 1925 colonial notification
• Article 371A, inserted by the 13th Constitutional Amendment (1962) to honour the 16-Point Agreement of 1960
• Assam’s Original Suit No. 2 of 1988 filed under Article 131 (Supreme Court’s original jurisdiction); mediators in 2010 (Sriram Panchu, Niranjan Bhatt) failed
• Three boundary commissions — Sundaram (1971), Shastri (1985), Pillai (1997) — none accepted by both states
• ONGC extracted ~1.02 million metric tonnes of crude at Changpang (Wokha district) between 1981 and 1994; abandoned it in May 1994 after an NSCN(IM) ultimatum; Nagaland notified its own Petroleum and Natural Gas Regulations in 2012
• Asia’s first commercial oil well: Digboi, Assam, 1889; Hydrocarbon Vision 2030 for North-East India (2016) targets doubling regional output
• Violence record: Chungajan clashes (1979, ~54 dead); Merapani confrontation (1985, 41 dead including 28 Assam police)
• Entry 53 of the Union List vests regulation of oilfields in the Centre; Oilfields (Regulation and Development) Act, 1948

Mains Relevance

GS Paper 2 (Federalism and Inter-State Relations): a live example of the Union as facilitator achieving in negotiation what 37 years of litigation under Article 131 could not.

• Revenue-sharing arrangements as instruments of cooperative federalism
• Statics anchored: Article 131, Article 263 (Inter-State Council), Article 371A, Entry 53 of the Union List, State of Nagaland Act 1962, 16-Point Agreement 1960
• Adjudication versus facilitated negotiation in resolving inter-state boundary disputes
• The Article 371A tension: protecting Naga customary rights versus freezing resource development

GS Paper 3 (Energy security and Northeast development): India imports over 85% of its crude; unlocking under-explored onshore prospectivity in the Northeast.

Essay: “sharing sovereignty’s dividends before settling sovereignty’s lines” as an illustration of cooperative federalism in practice.

Background and Context

Roots of the Boundary Dispute

The quarrel is older than Nagaland itself, rooted in colonial line-drawing.

• The British carved a Naga Hills district out of Assam in 1866 and kept shifting its limits; a 1925 notification folded forested foothill tracts into Assam’s plains districts
• On statehood in 1963, Nagaland’s boundary followed the 1925 line; Naga leaders never accepted it, claiming large parts of Golaghat, Jorhat and Sivasagar
• The contested stretch is managed as the Disputed Area Belt (DAB), six sectors (A–F) through reserved forests
• Four interim agreements in 1972 froze the status quo on paper; the CRPF has policed the belt since 1979
• See our note on inter-state boundary disputes

Violence and the Failure of Institutions

• Chungajan clashes (1979): around 54 people dead
• Merapani confrontation (1985): 41 dead, including 28 Assam police personnel, in fighting between two state police forces
• Three boundary commissions — Sundaram (1971), Shastri (1985), Pillai (1997) — never won acceptance from both states
• Assam filed Original Suit No. 2 of 1988 under Article 131 seeking the 1925 notification as the settled boundary; still at trial nearly four decades on
• Court-appointed mediators in 2010 could not close the gap — litigation preserved the stalemate rather than ending it

The Oil Freeze and Jurisdictional Gridlock

Oil is where the stalemate became expensive.

• ONGC entered Nagaland on a state permit in 1973 and pumped ~1.02 million metric tonnes of crude from Changpang (Wokha) between 1981 and 1994
• An NSCN(IM) extortion ultimatum forced ONGC to abandon Changpang in May 1994 — wells left unplugged, spills uncleaned
• On the Assam side, exploration stalled because neither state would let the other drill in claimed land
• Article 371A (from the 16-Point Agreement of 1960) bars Acts of Parliament on ownership and transfer of land and its resources from applying to Nagaland unless its Assembly so resolves
• Nagaland used this to notify its own Petroleum and Natural Gas Regulations in 2012, clashing with the Union’s Oilfields Act, 1948 and Entry 53 of the Union List
• See our explainer on special provisions for states under Articles 371-371J

The Energy-History Backdrop

• Upper Assam is India’s oldest petroleum province — Asia’s first commercial oil well came up at Digboi in 1889
• Hydrocarbon Vision 2030 for North-East India (2016) set out to double the region’s oil and gas output
• The disputed belt sits squarely inside this prospective geology, which is why a forest-tract quarrel froze a wanted hydrocarbon asset

Key Features of the Tripartite MoU

• Parties: Government of India (Petroleum and Natural Gas Ministry), Assam, Nagaland; signed in New Delhi 11 June 2026 with Amit Shah witnessing
• Joint exploration and production across 1,000+ sq km, including six disputed oilfields
• 50:50 sharing of hydrocarbon resources, delinking revenue from the unresolved boundary
• Open participation: both PSUs and private energy companies can operate
• Joint policing: a coordinated law-and-order mechanism between the two state governments
• Boundary case untouched: Original Suit No. 2 of 1988 continues before the Supreme Court
• Origin: an April 2023 in-principle understanding between the two CMs; three years to negotiate modalities

The Federalism Lens: Monetise Now, Adjudicate Later

• The 50:50 formula cuts the weld between the boundary question and the resource question that had frozen both for three decades
• Neither state concedes territory by signing — the suit survives intact — yet both earn from the belt immediately
• A zero-sum fight over a line becomes a positive-sum flow of royalties, changing each state’s incentive to escalate
• The Centre-as-broker pattern: Assam-Meghalaya agreement (March 2022, six of twelve sectors); Assam-Arunachal Namsai Declaration track (2023 boundary pact)
• Method: CMs negotiate directly, district committees ground-truth claims, the Union Home Ministry supplies the table and political cover — where the Inter-State Council under Article 263 and Article 131 suits have under-delivered; this sits at the heart of cooperative federalism

Challenges and Concerns

• The MoU monetises the dispute without resolving it; a final judicial boundary award could reopen whether 50:50 survives
• Article 371A politics: Naga civil society (including the Naga Hoho) wants drilling to follow Nagaland’s 2012 regulations and community consent — the MoU answers the inter-state pact demand, not yet the consent demand
• The Changpang legacy: ONGC’s 1994 exit without decommissioning and documented spill damage left deep local distrust
• Ecological sensitivity: the belt runs through reserved forests, and Doyang is a major Amur falcon roosting site
• Security coordination: a joint mechanism between police forces that fought at Merapani in 1985 is untested at oilfield scale; insurgent extortion pressure hasn’t vanished

Way Forward

Codify Fast, Drill Later

• Agree a detailed operating framework before the first rig moves: operator selection, royalty and revenue-flow mechanics, district-level benefit sharing on both sides
• Build in decommissioning bonds and a grievance-redress channel — the Changpang experience shows extraction without exit rules and local buy-in collapses

Use the Economic Thaw to Work the Boundary

• Adapt the Assam-Meghalaya model of sector-by-sector regional committees to the DAB’s six sectors
• Revive the Supreme Court’s mediation track with the new goodwill as capital
• A 50:50 formula that works on the ground is the strongest argument that the line, too, can be drawn without a loser

Conclusion

The Assam-Nagaland MoU is a work-around, not a settlement — its intellectual core is sequencing: monetise the belt now, adjudicate the boundary later. It applies, for the first time to an internal border with real money attached, the logic of separating the sovereignty dispute from the economic activity.

For energy security, a belt whose output can rise more than tenfold is no marginal asset, and the Northeast is the one Indian region where significant onshore prospectivity stays under-explored for political rather than geological reasons. Yet the hardest constitutional question — who owns the petroleum under Nagaland’s soil under Article 371A versus Entry 53 — has been parked, not answered. Implementation will be tested in villages, where benefit-sharing under customary law and credible environmental safeguards will decide whether the belt’s second oil era outlasts its first.

UPSC Practice Questions

Prelims MCQ 1

With reference to the 2026 Assam-Nagaland tripartite MoU, consider the following statements:

1. It provides for a 50:50 sharing of hydrocarbon resources from the disputed areas between the two states.
2. It settles the Assam-Nagaland boundary dispute, withdrawing Original Suit No. 2 of 1988 from the Supreme Court.
3. Only public sector undertakings, and not private companies, may operate in the disputed belt.

How many of the above statements are correct?

(a) Only one (b) Only two (c) All three (d) None

Answer: (a)

Explanation:

• Statement 1 is correct — the 50:50 formula is the operative principle.
• Statement 2 is incorrect — the MoU does not settle the border; Original Suit No. 2 of 1988 stays pending.
• Statement 3 is incorrect — both PSUs and private energy companies can participate.

Prelims MCQ 2

Article 371A, central to Nagaland’s claim over the petroleum beneath its soil, flows from which of the following?

(a) The Sixth Schedule (b) The 16-Point Agreement of 1960 (c) The Shillong Accord of 1975 (d) The Bodo Accord of 2020

Answer: (b)

Article 371A was inserted by the 13th Constitutional Amendment (1962) to honour the 16-Point Agreement of 1960; it bars parliamentary laws on Naga customary law and on ownership and transfer of land and resources from applying to Nagaland unless its Assembly so resolves.

UPSC Mains Questions

The Assam-Nagaland tripartite MoU on hydrocarbon exploration shows that inter-state disputes can be monetised before they are resolved. Examine how revenue-sharing arrangements can serve as instruments of cooperative federalism in managing India’s inter-state boundary disputes. (GS Paper 2, 15 marks)

Adjudication under Article 131 has rarely settled inter-state boundary disputes in the Northeast. Discuss why politically negotiated settlements facilitated by the Union government have delivered more outcomes since 2022, and the risks of bypassing constitutional machinery like the Inter-State Council. (GS Paper 2, 15 marks)