"Through transparent auctions with a ready provision of land, transmission and the like, solar tariffs have come down below thermal power cost," Goyal said in a tweet.
"We are moving rapidly towards realising the clean energy vision of Prime Minister Narendra Modi," Goyal tweeted further.
He congratulated Rajasthan Chief Minister Vasundhara Raje on "achieving the lowest-ever Indian solar tariff of Rs 4.34 per unit through reverse auction".
The solar power tariff fell to an all-time low, with Finland-based energy firm Fortum Finnsurya Energy quoting Rs 4.34 to bag the mandate to set up a 70-mw solar plant under NTPC's Bhadla Solar Park tender.
NTPC on Monday conducted the reverse bidding for 420 MW solar power projects to be set up at the Bhadla Solar Park-II near Jodhpur in Rajasthan.
In November last year, the solar power tariff had slid to an all-time low of Rs 4.63 following aggressive bidding by the US-based SunEdison, the world's biggest developer of renewable energy power plants.
"Based on the general procedure, a letter of intent (LoI) shall be issued within 15 days from the completion of the reverse auction and PPA shall be signed within 30 days after the LoI is issued," Fortum India MD Sanjay Aggarwal said in a statement.
Fortum India will be in a position to disclose details once the company signs the PPA with a relevant authority in India, the company said.
combined capacity of 420 mw saw aggressive bidding, the company said.
"The central government has set a target of 100 gw of solar power generation by 2020 along with bringing in grid parity and we are fully committed and contributing to achieving this ambitious goal," RattanIndia Solar CEO Anjali Rattan Nashier said.
SunEdison had won a bid to sell solar power from a 500 megawatt plant in Andhra Pradesh under the Jawaharlal Nehru National Solar Mission at Rs 4.63 per kilowatt-hour (kwh or unit).
SunEdison had offered tariff lower than that of SoftBank Group Corp of Japan and Chinese solar productmaker Trina Solar Ltd in the auction, industry sources said.
