General Electric

(GE) - Get Report

said this morning that its Power Systems unit signed a long-term service agreement with

PG&E National Energy Group

worth more than $1 billion.

PG&E will develop about 20 gas turbines at power plants throughout North America. GE will supply parts, services and repairs for the gas turbines for 12 years.

PG&E National Energy Group, which is based in San Francisco, is a division of

PG&E

(PCG) - Get Report

. The PG&E unit owns and operates more than 30 power plants in 10 states that produce more than 7,000 megawatts of power.