The ISA Countries section of ISA InfoPedia comprises country-specific pages where ISA Members provide information on news, policies, best practices, tenders etc. Country-specific information

ISA Infopedia

ISA Countries Catalogue

The ISA Countries section of ISA InfoPedia comprises country-specific pages where ISA Members provide information on news, policies, best practices, tenders etc.

Kingdom of Tonga

0.006 GW

The Kingdom of Tonga is a Polynesian country with a group of more than 170 islands spread over an area of the South Pacific. The total surface area is about 750 km2 scattered over 700,000 square kilometres of the southern Pacific Ocean. The sovereign state has a population of 108,020 of whom 70% reside on the main island of Tongatapu. Tonga is the second most climate vulnerable country in the world.

Tonga’s economy is dominated by subsistence agriculture, and therefore relies heavily on weather conditions and world commodity prices. Tonga’s economy also relies on remittances from the Tongan population living and working overseas.

Tonga is highly dependent on imported fuels to meet its overall energy requirements. Tonga's total fuel imports account for about 25% of all imports and about 10% of GDP. Apart from diesel, the most attractive electricity generation technologies in Tonga are solar, wind and to a lesser extent, biomass. Solar energy resources have a high potential in Tonga, particularly towards the north, where satellite measurements indicate average insolations of up to 5.8 kWh/m2/day.

The main source for lighting is electricity supplied through the national grid which is powered by the government-owned Tonga Power Ltd (TPL) which generates, distributes and sells electricity to four of Tonga’s islands: Tongatapu, Vava’u, Ha’api and Eua. As 92% of the electricity on the TPL grid is supplied from diesel generation, the price of diesel fuel is the major component of the electricity tariff. The total generation (diesel plus renewable) in all four islands groups for the year ending June 2017 was about 66.5GWh. The total renewable energy generation for 2016/17 was 4,823MWh, which had increased by 2.0% compared to 2015/16 where it was 4,730MWh.

In 2009, the Government of Tonga approved a goal of 50% of electricity to be generated from renewable energy sources by 2020 and an additional target in its NDC to have 70% of electricity generated from renewable sources by 2030. Under Tonga Energy Road Map (TERM) and with TPL direct operational input, five major solar plants were constructed. Furthermore, TPL owns 65kW roof-top micro solar capacity with 510kW of third-party micro solar capacity owned by private customers.

NFP Details: 


MEIDECC, Nuku’ALofa, Tonga

Phone- +676 8815340

Photovoltaic Map: 
Global Horizontal Irradiation Map: 
Direct Normal Irradiation Map: 
Webpage/Web Article

Honorable Sovaleni launches first solar power plant in ‘Eua

Article on The ‘Eua Solar Plant  which is a part of the Outer Islands Renewable Energy Project (OIREP) which aims at improving the quality, standard and cost of the power delivered to the people in the outer islands of the Kingdom of Tonga. 

Webpage/Web Article

Tonga commissions its MW sized solar facility

Article on Matatoa Solar Project that was built and is being operated by the Chinese company Zhuhai Singyes Green Building Technology CO. Ltd.


Electricity Commission

The main mission of the Electricity Comission are to ensure the provision of a safe, continuous and uninterrupted supply of electrical power to Tongan Consumers, and to ensure that the cost of such electrical power is kept as low as possible. 

Webpage/Web Article

Energy Planning Unit (EPU)

The EPU deals with planning, policy and the coordination as well as management of the energy sector. It is responsible for electrifying areas not reached by a TPL grid. 


Department of Energy, MEIDECC

The department is mandated to govern the energy strategy in Tonga under the NSDF (National Strategic Development Framework) .The Ministry of Meteorology, Energy, Information, Disaster Management, Climate Change and Communications (MEIDECC) is the main regulating body for all communication services, and has the role of lead communicator for government information in creating the outer islands of the Kingdom of Tonga.


Ministry of Finance and National Planning (MFNP)

The MFNP is the central institution with the economic and financial landscape of the kingdom. It’s mission is to ensure the provision of high quality and timely economic and financial policy advice to the government and increasingly effective economic management in the Kingdom


Tonga Power Limited (TPL)

TPL is national utility which produces, generates and distributes electricity to commercial and domestic customers in Tongatapu, Vavau, Haapai and Eua.

Legal/Regulatory Document

Renewable Energy Act 2008

The RE Act of 2008 provides a legal framework to promote the utilization of renewable energy in Tonga, through the creation of a conducive and an enabling market environment.

Legal/Regulatory Document

National Renewable Energy Policy 2006

Policy specifying the development plan for renewable energies in Tonga. 

Legal/Regulatory Document

Electricity Act 2007

Legislation governing the electricity sector in Tonga. 

Legal/Regulatory Document

National Strategic Planning Framework

Provides an overarching framework for the country's development over 10 years. 

Legal/Regulatory Document

Tonga Energy Road Map 2010-2020

Provides the country's road map for the energy sector from 2010 to 2020. 


Tonga Chamber for Commerce and Industry

The Website offers various information related to investment opportunities and to how to start a Business in Tonga. The chamber also aoffers tailored services for Business support.