Indian Railways is planning to come up with solar power tenders of 4 giga watt (GW) soon. : In a bid to cut down on its power purchase costs and utilise the vast stretches of linear land along the tracks with greater efficiency, the Indian Railways is planning to come up with solar power tenders of 4 giga watt (GW) soon. The bids will open up business opportunities of about Rs 18,000 crore for the domestic solar industry that consists of equipment makers and plant installers.