Kristoforus Jimmy Yans

Managing Partner

Jimmy obtained his law degree from University of Indonesia. Jimmy has served several multinational companies during his initial three years working period It gave him a lot of experience to handle compliance matter, foreign direct investment and licenses. In 2010, he started his professional career in a prominent law firm specializing in oil & gas industry. During his professional career, he experiences in drafting contract and legal opinion regarding specific legal issues encountered by client, performing legal due diligence to support client with legal data analysis for conducting corporate action, representing client in a contract negotiation, dispute resolution both non-litigation and litigation before Indonesia national court or arbitration. Throughout his career, he has advises Indonesia oil.

and gas state owned enterprise, state owned enterprise, regional owned enterprises, special task force for upstream oil and gas business activities Republic of Indonesia (SKK Migas), both domestic and foreign PSCs contractors, Indonesia stated owned electricity company, oil and gas service companies, cooperation operation (KSO) partner companies, foreign direct investment companies, startup companies, and also individual who encounter legal matter such as land matter, property, etc. By his experiences and competency, he has specialization in the area of engineering procurement construction (EPC) project, drilling and drilling support service, unitization of oil and gas fields, cooperation oil and gas operation in Pertamina working area, gas sales and transportation, power purchase.

During his professional career, he has experienced in several projects among others :

• Assist Indonesian authorities in preparing draft of laws and regulations particularly in oil and gas industry;
• Assist PSCs contractor in tender process in compliance with SKK Migas working guidelines;
• Providing legal opinion to Indonesian PSCs contractor concerning interpretation and implementation of PSC and other legal issues occurred in the oil and gas operation;
• Perform legal due diligence prior the participating interest (PI) and share acquisition;
• Provide legal analysis for Korean EPC Company for its plan to enter Indonesian Market;
• Advising regional owned enterprise concerning its cooperation with investor/financier in regard with the management of 10% Indonesian participant;
• Preparing, reviewing and negotiating contracts for Indonesian oil and gas state owned enterprises and other PSCs contractors, such as Oil and Gas Production Sharing Contracts, Joint Operating Agreements, Unitization and Unit Operating Agreements, Facility Sharing Agreements, Farm in Agreements, Engineering Procurement Construction Installation Agreements, Seismic/ drilling/ vessel/ fixed wing agreements, Principle of Agreement for the field development of Liquid Natural Gas, Operational Cooperation Agreement (KSO), Technical Assistance Contract, Enhanced Production Cooperation Agreement, Old Wells Work-over Contracts, Gas Sale Agreements, Partnership Agreements, and other contracts;
• Providing legal services to several investment funds of some major investment companies in terms of its dissolution and liquidation;
• Representing clients in private law dispute before Indonesia national court, Indonesia National Arbitration Body (BANI) and International Arbitration for various complex legal matters;
• Advising and assisting vessel and a construction company in conducting acquisition;
• Secondment as legal counsel at several oil and gas company in Indonesia, to support its legal department.
• Preparing, reviewing and negotiating contracts for Indonesian electricity state owned enterprises, such as Power Purchase Agreement, Gas Sales Agreement, Gas Transportations Agreement, Regasification Facility Agreement;
• Assisting Indonesian electricity state owned enterprises in:

1. implementing energy transition program;
2. preparing proposal for several drafts of regulation particularly in renewable power generation sector;
3. Gasification of Power Plant Project

Adhesa Pramudya Abiyanto

Junior Partner

Adhesa graduated from the Faculty of Law of Atma Jaya Catholic University of Indonesia in 2010, and obtained his Master’s Degree from the Faculty of Law of Gadjah Mada University in 2017, both focusing on Economic & Business Law. Adhesa has provided legal services since 2010, in several prominent law firms and various practice areas. Adhesa has experienced in assisting clients from various background, such as state-owned enterprise, foreign and domestic companies in energy sector, service companies, shipping companies, general mining companies and individuals. He involved in many projects in energy sector, in particular assisting clients in dispute settlement both before the arbitration and Indonesia national court with various complexity disputes such as EPCI contract, Technical Assistance Contract (TAC),

Refinery Lease agreement, Drilling Contract, Coal Sales Agreement, Infrastructure Lease Agreement, Pre-emptive right of minority shareholder and many others. He also involved as defense attorney on various corruption case for individuals, whether from private sectors or government executives. He also experiences in advising companies regarding risk and mitigation of available actions for managements, whether transaction or policy related issues. Adhesa is actively providing legal knowledge to law undergraduates in several universities, who participates in national moot court competition.

Throughout his career, he has involved in:

• Acting as the defense lawyer team in several corruption cases for various clients, such as the Director of private company, district attorney, Head & Deputy of a Government Body, Mayor, and the Director of State-owned company;
• Representing clients in arbitration, whether in BANI, ICC, or SIAC, among others:
• Dispute regarding Pre-emptive rights of a TOLL road company shareholder;

1. Dispute regarding EPC Contract for Gas Processing Plant, with a total claim of ±USD126,000,000;
2. Dispute regarding EPC Contract for Gas Turbine Power Plant, with a total claim of ±IDR250.000.000.000;
3. Dispute regarding EPC Contract for Coal Fired Power Plant, with a total claim of ±IDR3.000.000.000.000;
4. Dispute regarding EPC Contract for Coal Fired Power Plant, with a total claim of ±IDR800.000.000.000;
5. Dispute regarding Gas Transportation Agreement, with a total claim of ±USD400,000,000;
6. Dispute regarding Gas Sales & Purchase Agreement, with a total claim of ±USD12,000,000;
7. Dispute regarding Technical Assistance Contract (TAC); and
8. Dispute regarding Joint-Operating Agreement for jack-up rig operation.

• Representing clients before the Indonesian Court in various civil cases, whether regarding tort or breach of contract;
• Advising various companies, in a matter of, patent infringement accusation, personal data breach and defamation accusation, lease, operating, & maintenance agreement of an FSRU, push down liability received by a subsidiary company, etc.
• Assisting in negotiation for EPC Contract, sale & purchase agreement for acquisition, emergency well services, etc.
• Cooperating with international law firms in advising clients or representing before the arbitration.

Margaretta Mellisa Yans

Junior Partner

Mellisa is an expert focusing in commercial and corporate matters; she earned her Bachelor of Laws degree, majoring in Business Law from the prestigious University of Indonesia. Prior joining JTAsyer in 2017, Mellisa built a unique industry perspective through her professional experience at leading media and entertainment companies, including O Channel TV, Skymedia Network, and MTV Indonesia. Mellisa has various experience assisting domestic and international clients in navigating Indonesia’s regulatory landscape, and successfully negotiating high-value commercial agreements, among others: power purchase agreements; gas sales agreement for both upstream and downstream transaction; gas transportation agreements; vessel charters; coal sales agreements; hedging agreement for LNG price; and electricity supply agreements. Notably, Mellisa has assisted clients in negotiating gas sales and gas infrastructure development agreement for supporting the expansion of gas distribution across Indonesia with contract value exceeding IDR 1 trillion.

Her practice spans the energy sector, corporate and commercial matters, and entertainment law. She also has played a pivotal role in drafting and advises on mergers and acquisitions, including share sale and purchase agreements, and represents clients in alternative dispute resolution. She also assists clients in securing permits and approvals from key authorities such as the Ministry of Health, the Indonesia Investment Coordinating Board (BKPM), the Ministry of Law and Human Rights, the Ministry of Industry, regional governments, and other relevant institutions.

Leveraging her background, Mellisa also provides comprehensive legal opinions, and extensive regulatory research relating to energy, media, advertising, and content-related agreements. Her multidisciplinary experience, combined with her commercial mindset and attention to detail, allows her to deliver practical, forward-looking advice tailored to each clients’ business objectives with her professional standing and commitment to the highest standards of legal excellence. Mellisa is a licensed Advocate and a member of the Indonesian Advocates Association (PERADI).