Renewable Energy Development

GWP has a long history of supporting renewable energy. In 1937, Glendale became one of the first California cities to contract with the Federal Government to purchase hydropower from Hoover Dam, and we've been generating electricity using landfill gas from Scholl Canyon since 1994. More recently, GWP has made long term investments in wind, small hydroelectric, and geothermal generation resources. In addition, we built a 261 KW solar photovoltaic generating system on top of the parking garage at the local community college.

To show our continued commitment to renewable resource development, GWP adopted a Renewable Portfolio Standard (RPS) in 2004. The GWP RPS recognizes the intent of the Californian Legislature to encourage renewable resources, while taking into consideration the effect on rates, reliability, financial resources, and the goal of environmental improvement. The new GWP RPS sets an initial goal of 20% of its annual energy requirements from renewable energy sources by 2017, with the additional goal of 23% if it can be reached at reasonable cost.

Today, GWP proudly provides approximately 22% of its energy requirements from renewable resources on an annual basis as follows:

GWP's Renewable Resources

Resource	Type	Capacity (MW)	Max Energy (MWh/year)
Hoover	Hydro	20	58,000
High Winds Generation	Wind	3	23,000
Southwest Wyoming Wind	Wind	10	25,000
Heber South	Geothermal	3	18,000
Scholl Landfill	Landfill Gas	8	70,080
Pebble Springs Wind	Wind	20	42,000
Glendale College	Solar	0.3	400
Verdugo Metro	Hydro	0.3	400
Tieton Hydroelectric	Hydro	10	22,000

Detailed Information on GWP's Renewable Resources

Hoover & Other Hydro Providers

The GWP entitlement in the Hoover Dam Power Project totals 20 MW. This resource is formally purchased from Western, and consists of an up-rated portion of the plant of 2 MW and a renewal portion of 18 MW, with annual associated energy of approximately 2,000 MWh and 56,000 MWh, respectively. This contract remains in effect until October 1, 2017.

Tieton Hydropower Project (Tieton) was built in 2005-06 at the base of Tieton Dam, which was constructed during the period of 1917-25 for irrigation purposes. At times during the year, the water upstream of the dam is frozen and the plant generates no energy. The plant operates only when water is released through the dam for irrigation needs, which is anticipated to occur annually between the months of May through October. Glendale now owns 50% of this 20 MW facility, with an annual energy allotment of approximately 22,000 MWh.

Additionally, GWP owns and operates the Verdugo Metropolitan Hydroelectric Plant, a small hydroelectric generating plant designed to operate in conjunction with the Verdugo Metropolitan Pump Station. This plant is rated at 300 kW and initially had an average yearly production of 1,000015,690 MkWh. Recent water conservation efforts, however, have resulted in reduced water flow which has brought the average yearly production down to approximately 400,000 MkWh. This lower energy production is sufficient to sustain the electrical energy needs of the pump station. Any excess energy is integrated into the GWP electrical distribution system.

Scholl Canyon Landfill

In July , 1994, GWP completed a 5-mile pipeline that transports methane gas produced at Scholl Canyon landfill to the steam boilers at the Grayson Power Plant. Starting in July , 1994, Grayson Units 3, 4, or 5 have generated power using this methane at a minimum loading of approximately 8 MW. Any additional output from Units 3, 4, and 5 is fueled by natural gas. During fiscal year 2010, the Grayson Power Plant generated approximately 70,080 MWh from Scholl Canyon landfill gas. The energy produced from Scholl Canyon landfill gas is CEC RPS Certified.

High Winds Generation Facility (PPM1 Wind Project)

GWP has signed a 25-year power purchase contract with Iberdrola, formerly known as PacifiCorp Power Marketing, Inc. (PPM) for the purchase of wind powered electrical energy associated with a 9 MW share of the 145.8 MW High Winds wind generation facility located in Solano County, California. The contract allows GWP to have power delivered at a flat 3 MW based on a 33% capacity factor. Therefore, this resource will provide 23,000 MWh of renewable energy on an annual basis to GWP customers. This contract commenced on September 1, 2003.

Heber South Geothermal Power Project

GWP has signed a 25-year contract with SCPPA for the purchase of up to 3 MW of geothermal power. The project is located in the geothermal areas of Imperial Valley, California. This contract commenced in February , 2006 at the level of 1 MW. An additional 2 MW was added in 2008. Currently, GWP receives approximately 18,000 MWh of renewable energy on an annual basis from this project.

Southwest Wyoming Wind Generation Facility (PPM2 Wind Project)

GWP has signed a 16-year power purchase contract with Iberdrola. This 2nd wind power contract with Iberdrola will provide up to 10 MW of capacity at a 33% capacity factor from a generation facility located in Southwest Wyoming. The contract commenced in July , 2006, and currently provides approximately 25,000 MWh of renewable energy on an annual basis to GWP's customers.

Pebble Springs Wind Generation Facility (Wind Project-3)

GWP has signed an 18-year agreement with SCPPA for the purchase of 20 MW of wind powered generation located in Gilliam County, Oregon. Iberdrola has contracted with SCPPA to be the power supplier. GWP’s share of Pebble Springs is 20 MW with an expected capacity factor of 33%. The project will provide GWP with approximately 42,000 MWh of energy per year. The project commenced service on January 1, 2009.

Grid-Connected Photovoltaic Power Generation

GWP is committed to exploring new renewable energy options for its customers. GWP currently offers rebates for customers to install grid-connected photovoltaic power generation systems. These systems require an interconnection agreement that allows GWP to buy any excess power from the customer. To date, in cooperation with various residential and commercial customers, approximately 700 kW of grid-connected photovoltaic generation has been installed on various structures within the City including the Glendale Community College PV array on their Parking structure.

Future Renewable Energy Investment Possibilities

• Partnering with the Southern California Public Power Authority to review and evaluate proposals for renewable energy with an eye toward obtaining an additional 3 to 10 MW of renewable generation.
• Working with other utilities looking into the possible development of transmission lines emanating from the southeastern deserts of California with the goal of providing a route to receive solar and geothermal power.
• Upgrading the STS transmission line to provide a route to receive additional renewable power from the Wyoming-Utah area into Southern California.