The major electricity supplier is Ente Nazionale per l'energia ELettrica (ENEL), which although also privatised, is subject to strict governmental controls. It has an annual revenue of €38.153 billion, making it the third largest energy provider in the world. Electricity supply can be unpredictable in the Naples region, although has been more regular in recent years. Residential power supply generally provided between 1.5 kW and 6 kW, although commercial premised and industries are supplied at higher wattages. Most Italian homes run at 3 kW, which often results in blown fuses if too much demand is placed on the supply. Gas provision has slightly more choice for the consumer than electricity, but surprisingly tends to be more expensive. SIG and Italgas are the major suppliers, and most properties in San Giorgio a Cremano are connected to mains supply, although bomboli, or small portable gas canisters are still used by some residents.