Yes and yes!
You can buy your Energy Subscription starting in Year 5. After purchasing the system, you will own the system and no longer pay the monthly bill. However, as the new system owner, you will also be responsible for system maintenance.
You can also pre-pay your energy subscription at any time! This means you will no longer pay your monthly bill, but Daylight will still own the system, covering operations and maintenance. You are required to pay the entire remaining amount if you choose to pre-pay.