India’s central government has sent a reminder to the northwestern state of Rajasthan to install solar photovoltaic (PV) systems on its government buildings, the Economic Times reported this week.

In a move aimed at reducing the state’s electricity costs, the central government had requested in August 2015 that the state ‘explore opportunities’ to install on-site solar systems ‘in available roof space and other available space fit for the purpose’.

However, to date few solar systems have been installed, the newspaper said, citing ‘lukewarm’ response due to high up-front installation costs.

An unnamed spokesperson was quoted as saying that ‘There are already provision of mandatory use of some solar power in government buildings, offices, hospital and other establishments. It is not implemented properly even when there is subsidy available.’

‘Most offices are yet to follow’ the directive, the spokesperson said.

According to an official interviewed by the Economic Times, about 10 square metres are required for 1 kW in solar rooftop capacity, while Rajasthan’s government buildings feature over 5000 square metres of unused rooftop space.

In its reminder, the central government noted that ‘even if a part of this roof space is utilized for setting up rooftop solar power systems, thousands of MW of solar power can be generated saving money for the government.’

India aims to install 100 GW of solar power capacity by 2022, with around 40 GW of this expected to come from rooftop systems.