along its stretch. The development and manufacture of health care devices and software is a growing sector of the state's economy, with key players such as GE Healthcare, Epic Systems, and TomoTherapy. Tourism Tourism is a major industry in Wisconsin—the state's third largest, according to the Department of Tourism. Tourist destinations such as the House on the Rock near Spring Green, Circus World Museum in Baraboo, and The Dells of the Wisconsin River draw thousands of visitors annually, and festivals such as Summerfest and the EAA Oshkosh Airshow draw international attention, along with hundreds of thousands of visitors. Given the large number of lakes and rivers in the state, water recreation is very popular. In the North Country, what had been an industrial area focused on timber has largely been transformed into a vacation destination. Popular interest in the environment and environmentalism, added to traditional interests in hunting and fishing, has attracted a large urban audience within driving range. The distinctive Door Peninsula, which extends off the eastern coast of the state, contains one of the state's tourist destinations, Door County. Door County is a popular destination for boaters because of the large number of natural harbors, bays, and boat launches on both the Green Bay and Lake Michigan sides of the peninsula that forms the county. The area draws more than two million visitors yearly to its quaint villages, seasonal cherry picking, and fish boils. Film industry On January 1, 2008, a new tax incentive for the film industry came into effect. The first major production to take advantage was Michael Mann's Public Enemies. While the producers spent $18 million on the film, it was reported that most of it went to out-of-state workers and for out-of-state services; Wisconsin taxpayers had provided $4.6 million in subsidies, and derived only $5 million in revenues from the film's making. During this period, the movie Transformers: Dark of the Moon also used Milwaukee as a filming location. This incentive was eliminated in 2013. Energy Wisconsin has no production of oil, gas, or coal. Its in-state electrical generation is mostly from coal. Other important electricity sources are natural gas and nuclear. The state has a mandate that ten percent of its electrical energy come from renewable sources by the end of 2015. This goal has been met, but not with in-state sources. , a third of that ten percent comes from out of