Met Ed is a type of company which provides energy saving solutions.

It provides different types of products

Appliances
Lighting
Consumer Electronics
HVAC & Water Heating
Residential Energy Audit

As you have asked about the Met Ed Solar Water Heating rebates, I am giving you some information about it
Pennsylvania residential customers of Met-Ed, Penelec, Penn Power and West Penn Power can obtain a $500 rebate for the installation of high-efficiency solar thermal water heating systems.

The solar thermal water heater rebate is one more way FirstEnergy's Pennsylvania services are working to help customers reduce their energy usage and increase their energy efficiency.
The $500 rebate is accessible to residential customers of Met-Ed, Penelec, Penn Power and West Penn Power on certain equipment purchased between June 1, 2013, and May 31, 2016.
Rebates must be sent in inside 180 days of purchase.

Additional restrictions apply;

Simply contact a local participating contractor — a trained professional who is familiar with the program details can:

Assess your current system
Explain energy-efficient solar technology
Provide a detailed estimate
Perform a quality installation
Help to complete your rebate application