The Act to Protect the Privacy of Online Customer Information ('the Act') entered into effect, on 1 July 2020. In particular, the Act prohibits, among other things, internet service providers ('ISP') from using, disclosing, selling, or permitting access to customer personal information unless the customer has expressly given their consent. In addition, the Act prohibits ISPs from refusing to serve a customer, charging a customer a penalty, or offering a customer a discount if the customer does or does not consent to the use, disclosure, sale, or access of their personal information. Moreover, the Act provides for exceptions to customer consent requirements and measures for the security of customer information. 

You can read the Act here and view its history here. 

UPDATE (1 July 2020)

AG delays enforcement of internet privacy law 

Peter Guffin, Partner at Pierce Atwood LLP, told OneTrust DataGuidance, "Although [the Act] took effect on 1 July 2020, the Maine Attorney General has agreed to delay any enforcement actions for one month in light of the ISP's need to devote efforts to avoiding service operations during the COVID-19 ('Coronavirus') pandemic."