Fiji and Tuvalu have joined an Indian initiative to increase solar energy production.
The International Solar Alliance was launched by India in late 2015 and has about 40 countries as members.
The Alliance's aim is to undertake innovative efforts to develop solar power technology at a reduced cost.
India's government said the Alliance is seeking investment to promote energy security and access for its members.
Any country located between the Tropics of Cancer and Capricorn is eligible to join the Alliance.
Vanuatu is also a member.