If you are interested in installing a renewable generation system, your first step is to work with an installer and Heartland to determine what size solar array is right for you. The formula above can help with that. Our staff can help look at your usage to help refine your right size solar array. When you and your installer have determined what will be installed, you’ll need to submit an interconnection proposal to Heartland. An application form and $100 fee are required for systems 10 kilowatts or smaller. Systems larger than 10 kilowatts have a more complicated approval process due to concerns about the produced power on the cooperative's infrastructure. For very large systems, members will be required to cover the costs of an analysis conducted by an independent engineer.