Canberra mainly comes from the national power grid through substations at Holt and Fyshwick (via Queanbeyan). Power was first supplied from a thermal plant built in 1913, near the Molonglo River, but this was finally closed in 1957. The ACT has four solar farms, which were opened between 2014 and 2017: Royalla (rated output of 20 megawatts, 2014), Mount Majura (2.3 MW, 2016), Mugga Lane (13 MW, 2017) and Williamsdale (11 MW, 2017). In addition numerous houses in Canberra have photovoltaic panels and/or solar hot water systems. In 2015/16, rooftop solar systems supported by the ACT government's feed-in tariff had a capacity of 26.3 megawatts, producing 34,910 MWh. In the same year, retailer-supported schemes had a capacity of 25.2 megawatts and exported 28,815 MWh to the grid (power consumed locally was not recorded). The ACT has the highest rate with internet access at home (94 per cent of households in 2014–15). Economy The economic activity of the Australian Capital Territory is heavily concentrated around the city of Canberra. A stable housing market, steady employment and rapid population growth in the 21st century have led to economic prosperity and, in 2011, CommSec ranked the ACT as the second best performing economic region in the country. This trend continued into 2016, when the territory was ranked the third best performing out of all of Australia's states and territories. In 2017–18, the ACT had the fastest rate of growth in the nation due to a rapid growth in population, a strongly performing higher education sector as well as a significant housing and infrastructure investment. Higher education is the territory's largest export industry. Canberra is home to a significant number of universities and higher education providers. The other major services exports of the ACT in 2017-18 were government services and personal travel. The major goods exports of the territory in 2017-18 were gold coin, legal tender coin, metal structures and fish, though these represent a small proportion of the economy compared to services exports. The economy of the ACT is largely dependent on the public sector with 30% of the jobs in the territory being in the public sector. Decisions by the federal government regarding the public service can have a significant impact on the territory's economy. The ACT's gross state product in 2017-18 was $39.8 billion which represented 2.2% of the overall gross domestic product of Australia. In 2017-18 the ACT economy grew