Solar & hybrid power
Solar and solar–diesel hybrid plants, including mini-grids for small islands and remote areas that still depend on diesel generation.
PT Aria Royal Kapital · Jakarta
Strategic Capital for Indonesia’s Energy Transition
ARK is a strategic investment company in renewable energy and technology, built on our founder’s more than a decade of experience in solar power development.
Founder’s track record
View the Arya Watala Capital record →
From 2008 to 2022, through Arya Watala Capital, our founder developed solar power for remote villages, tourism areas and industrial customers, with projects in East Nusa Tenggara and Kalimantan.
Labuan BajoSumbaKatingan
01About ARK
A long-term partner for clean energy
PT Aria Royal Kapital (ARK) is a Jakarta-based strategic investment company focused on renewable energy and the technology that supports it.
We work alongside project developers and businesses as a long-term partner, pairing capital with hands-on support in governance and business development. Our perspective comes from the field: years of developing solar power on islands and in remote areas, where reliable electricity changes what communities and businesses can do.
Vision
An Indonesia powered by clean, reliable and affordable energy.
Mission
- Back renewable energy and technology initiatives that move Indonesia’s energy transition forward.
- Build long-term partnerships founded on good governance.
- Bring practical project-development experience to every partner we work with.
Integrity & governance
Clear structures, transparent decisions and accountability to our partners.
Long-term partnership
We stay engaged beyond the first agreement and grow with the people we work with.
Field experience
Our view is shaped by projects on the ground, not only on paper.
Sustainability
Energy that serves communities and the environment over the long run.
02Focus
Renewable energy, and the technology behind it
Indonesia’s energy transition runs across thousands of islands, many of them still reliant on diesel. Our focus follows the work we know best.
Distributed energy
Rooftop and on-site solar for industry, commercial buildings and tourism areas, bringing clean power closer to where it is used.
Enabling technology
Digital tools that help clean energy work in practice: monitoring, energy management and efficiency.
03Approach
How we work
Long-term strategic partnerships, with support in governance and business development at every stage.
01
Understand
We start from the site, the grid and the community, testing technical, commercial and regulatory realities early.
02
Partner
We commit as a long-term strategic partner, with governance aligned from the outset.
03
Strengthen
We support structuring, governance and business development as the project or company grows.
04
Sustain
We stay engaged through construction and operation, not only at the start.
04Leadership
Led by experience in the field
Aria Sulhan Witoelar
Chief Executive Officer
Aria Sulhan Witoelar is an entrepreneur and industrial engineer, a graduate of Universitas Indonesia. In 1996 he founded the digital agency Bubu.com, which he led until 2013.
In 2008 he founded Arya Watala Capital, which he led until 2022, developing solar power for remote villages, tourism areas and industrial customers, with projects in East Nusa Tenggara and Kalimantan. He has presented on solar mini-grids for Indonesia’s islands at COP22 in Marrakech (2016) and COP23 in Bonn (2017).
He is active in the Indonesian Chamber of Commerce and Industry (KADIN), where he served as Vice Chair for Energy Transition and Environment from 2015 to 2020.
Beyond leading ARK, Aria Sulhan Witoelar actively provides strategic advisory to government institutions.
- Education
- Industrial Engineering, Faculty of Engineering, Universitas Indonesia
- Founded
- Bubu.com (1996) · Arya Watala Capital (2008)
- Speaker
- COP22, Marrakech (2016) · COP23, Bonn (2017)
- KADIN
- Indonesia–Africa Bilateral Committee (2025–present) · Vice Chair, Energy Transition and Environment (2015–2020)
05Insights
Notes on the energy transition
Writing and talks by our CEO on clean energy for Indonesia’s islands and remote areas.
Powering the Archipelago
Electrifying small islands with hybrid solar, presented at the Indonesia Pavilion, COP22 Marrakech.
Read ↗Solar PV-Based Renewable Energy Mini-Grids for Small Islands or Remote Areas Electrification in Indonesia
Presented at the Indonesia Pavilion, COP23 Bonn.
Read ↗Rural Electrification through Village Grids / Mini-grids in Indonesia
Presented at Renewable Energy for Indonesia 2017, Jakarta.
View ↗