All routes will be electrified to save on imported-fuel costs. Off-the-grid solar-powered trains are planned with the installation of one gigawatt of solar and 130 megawatts of wind power between 2017 and 2022; India introduced the world's first solar-powered train and 50 coaches with rooftop solar farms in June 2017. Initial assessments of this experiment have been positive. Rooftop solar electricity is planned at stations to reduce long-term fuel costs and protect the environment. and Sustainable LED lighting at all the stations was completed by March 2018 which saves Rs 500 million per annum in electricity bills. Locomotive factories have been modernised, including two new factories in Bihar: an electric locomotive factory in Madhepura and a diesel locomotive factory in Marhaura, and 2,285 bio-toilets were introduced from April to July 2014. A partnership with Alstom to supply 800 electric locomotives from 2018 to 2028 was announced.