We support renewable energy and partner with our customers to
ensure safe and reliable interconnection of renewable energy into the electric
Combined Heat and Power (CHP), or cogeneration, provides both an
on-site source of electric power and useful energy from a single fuel source.
These systems capture thermal energy that would normally be lost in traditional
power generation and use it to serve on-site heating and cooling needs.
A form of distributed generation, CHP systems typically are
located at or near the energy-consuming facility. Recovering the heat normally
lost in power generation or transmission processes to provide on-site heating
or cooling results in increased energy-efficiency and reduced greenhouse gas
CHP systems are configured with either a topping or bottoming
cycle. In a typical topping cycle system, fuel is combusted in a prime mover --
such as a gas turbine or reciprocating engine -- to generate electricity. Most
energy lost from the prime mover’s hot exhaust and cooling systems is recovered
and provides valuable and usable heated air or water. The heated air is
generally used for industrial processes such as petroleum refining or food
processing, and the hot water is typically used for laundry, dishwashing, space
heating, cooling, and dehumidification. In a bottoming cycle system, also
referred to as “waste heat recovery,” fuel is combusted to provide thermal
input to a furnace or other industrial process. Any heat rejected from this process
is then used for electricity production.
In Maryland, the energy generated by CHP systems must be
consumed by the facility and no excess generation can be fed back onto the
grid. Thus, no DC-to-AC inverter is required and Delmarva Power does not install
a net-capable meter. Based on the standard Maryland Level 2, 3, & 4
Interconnection Application and Agreement, the Maryland Combined Heat and
Power Interconnection Application and Agreement
facilitates these special circumstances and provides CHP-specific directions
for completing the application form and review process.
CHP systems in Maryland may be eligible for rebates under the
EmPOWER Maryland Energy Savings Program for Commercial & Industrial
customers. This requires a separate application. For more information, see the
EmPOWER Maryland CHP