Pay You can pay Earth Energy Systems online with a credit card or your PayPal account! Please enter your invoice # if you know it: Please type the amount you are paying (no “$” sign): A 3.5% PayPal transaction fee will be added to your total. Or mail check payments by Date Due to: Earth Energy Systems Company 24683 State Hwy 35/70 Siren, WI 54872 Thank you for your business!