Erg S.p.A., acronym for Edoardo Raffinerie Garrone, is an Italian energy company, founded in 1938, and based in Genoa, Italy.

[5] In 1999 it opened gas, (petrol), stations network in Spain through Erg Petroleos, sold in 2008 to Saras S.p.A.[8] In 2007 Erg started to operate in the French[9] and German[10] wind markets, acquiring wind farms also in Bulgaria, Romania, Polonia and United Kingdom.

[19][11] In 2015 Erg entered the hydroelectric sector, via acquisition of E.ON's Italian assets, with 527 MW of capacity.

[11] In the same year, Erg entered the solar power business through the acquisition of 89 MW (30 photovoltaic plants) in Italy.

Operational since 15 April 2009,[28][29] it was the result of a commercial agreement between Erg and Vodafone (the service, launched as ESP MVNO, in fact uses the GSM/GPRS/UMTS network of the British company).

On 10 January 2018, the sale of the TotalErg business unit relating to fuels to Gruppo API was completed and on 30 November 2018,[30] after months of uncertainties and disservices in the provision of new SIMs, the operator, via an SMS, notified its customers of the cessation of all activities starting from March 30, 2019.