TransitionZero launches ASEAN-wide modelling capabilities in Scenario Builder

London, 2 June 2026: Climate tech non-profit TransitionZero has launched the latest upgrade to its flagship no-code energy system modelling platform, Scenario Builder.

ASEAN is the first region where this multi-country modelling capability is live, covering 10 countries and 25 nodes across Southeast Asia in a single integrated model.

The launch comes as the region prepares for a new phase of cross-border transmission projects and the possibility of cross-border power trade alongside traditional long-term power purchase agreements.

The new multi-country modelling feature gives users in Singapore, Malaysia, Indonesia, the Philippines, Thailand, Vietnam, Myanmar, Laos, Brunei, and Cambodia an open access modelling environment for regional power-system analysis.

This upgrade enables energy planners across Southeast Asia to model cross-border power systems in a single platform, supporting faster planning workflows, more consistent assumptions across borders, and evidence-based decision-making for cross-border investments.

Why regional grid integration matters

Regional grid integration is widely discussed as important to energy security and coordination, as well as cost-effective for scaling renewables in Southeast Asia.

But until now, cross-border grid assessments have been limited, and the tools to model them have often been expensive, proprietary, or dependent on bespoke commissioned studies.

As ASEAN moves toward layered electricity markets, where long-term power purchase agreements coexist with emerging short-term cross-border trade, planners need tools that can model both the integrated regional system and individual country conditions at the same time.

Scenario Builder’s multi-country modelling capability is TransitionZero’s direct response to that challenge.

“Regional grid planning in ASEAN has entered a new phase. The conversation has moved from whether to build interconnectors to how cross-border markets get designed, how projects get financed, and how decisions get made across jurisdictions. Those are complex, high-stakes questions that require tools different stakeholders can use themselves, with transparent assumptions. Scenario Builder’s multi-country modelling gives ASEAN’s energy community the tooling to build those models and test those scenarios, so capital can be committed and design discussions can be properly informed,” said Matt Gray, CEO of TransitionZero.

A platform built on open access principles

This new multi-country modelling feature is embedded into TransitionZero’s existing no-code and cloud-native modelling tool, Scenario Builder.

Scenario Builder is designed for power system analysts, planners, and policymakers to build, run, and analyse long-term capacity expansion and dispatch models rapidly and transparently.

When planners work from a shared, open model, they can align on the inputs and assumptions that drive model outcomes, compare scenarios, and identify trade-offs more transparently.

This supports more informed cross-border planning, market design discussions, and regional investment decisions, while reducing duplication of modelling effort across the region.

TransitionZero’s open approach removes traditional barriers to energy modelling, including closed datasets, proprietary tools, and the need for dedicated technical expertise.

It is designed to strengthen in-house modelling capacity within governments, planning bodies, and other institutions working on energy transition decisions.

Connecting power systems with real-world relevance

With this latest multi-country modelling capability, integrated analysis of power systems across ASEAN is now possible within a single interface, covering energy generation, transmission, and trade flows.

Multi-country modelling allows planners to test cross-border scenarios without commissioning separate studies or stitching together fragmented national models.

Users can evaluate how regional interconnection could expand viable clean energy pathways, where transmission constraints are most binding, how different trade structures affect costs across the system, and how national plans interact at a regional level.

A planner could use Scenario Builder to model how increased renewable capacity in one country affects neighbouring grids, where transmission bottlenecks emerge under different trade structures, or how regional interconnection changes the least-cost generation mix across ASEAN.

“The APG model gives planners, researchers, and institutions a practical way to understand how power systems interact across Southeast Asia. By bringing generation, transmission, dispatch, and trade flows into one open modelling environment, Scenario Builder helps users compare options, understand trade-offs, and work from transparent assumptions. What we are excited to see now is how users apply this capability to their own planning questions, and how open modelling can support more practical, evidence-based conversations across the region,” said Ajita Mishra, Head of Market Development at TransitionZero.

As with all models on Scenario Builder, users begin with a 'model-ready' dataset and a calibrated 'least-cost' scenario. This scenario is a starting point - not a forecast or a policy commitment. Users can rapidly adjust assumptions around demand, fuel prices, technology costs, and policy constraints to understand how different choices shape costs, investments and emissions.

Multi-country modelling is now live on Scenario Builder. Explore the ASEAN Power Grid model today.

For media inquiries, contact:

Chua Sheng Rui, Strategy Consultant. Email: shengrui@swstrategies.org. Mobile: +65 9137 2102.

Tan Li Wen, Strategy Consultant. Email: liwen@swstrategies.org. Mobile: +65 9655 6045.

About TransitionZero

TransitionZero is a climate tech non-profit founded in 2021. TransitionZero builds software to reduce the time to build clean energy at scale. We pioneer open access and open source tools that make electricity system modelling more transparent, accessible, and actionable for governments, financiers and grid operators worldwide.

Our flagship tool, Scenario Builder, enables policymakers, planners and investors to rapidly build, analyse and share energy system and electricity grid models without coding expertise or external consultants. Supported by model-ready datasets, training and market insights, our tools strengthen in-house capacity and support resilient, affordable and locally-led energy transitions.

Since launching publicly in October 2025, Scenario Builder spans 16 countries and supports around 500 users from think tanks, government agencies, utilities, system operators, and financial institutions. TransitionZero is entirely grant-funded by leading climate philanthropies, including Google.org, Sequoia Climate Foundation, Bloomberg Philanthropies and the European Climate Foundation, among others. For more information, visit our website or contact us.