Distributed generation is growing

Customer-sited generation is growing in the U.S.  A look at some of the distributed generation projects that came online in September 2014 shows that universities and institutions are developing projects powered by natural gas, solar photovoltaics, and oil, thanks to policies such as remote net metering and support for microgrid development.

At the University of California at Santa Cruz, Santa Cruz Cogeneration Associates has brought online a new 4.4 megawatt natural gas-fired cogeneration plant. The power generated is used on-site at the UC Santa Cruz campus.   Meanwhile the new unit will generate more than twice as much useful heat as the existing cogeneration unit, with a capacity of 1,391 tons (16,693 kBtu/h) of heating.

At the University of California at Riverside, Solar Star California XXIX LLC’s 3 megawatt UC Riverside Solar project is now online.  All of the power generated is used on-site at the UC Riverside campus, with the project's peak load representing about 30% of the campus's base load.  The University partnered with SunPower Corporation to install the 10.92-acre solar farm on campus open space.

Farther east, Cornell University’s 2 MW Snyder Road Solar Farm project came online. The power generated is used on-site at the Cornell University campus.  Cornell’s first solar photovoltaic project includes a 2MW tilt rack-mounted array on eleven acres of Cornell property in the Town of Lansing.  The Snyder Road Solar Farm is expected to produce 2.5 million kilowatt-hours annually, covering about 1 percent of Cornell’s total electricity use, and is expected to reduce the university’s annual greenhouse emissions by 625 metric tons per year.

Santa Fe Community College’s 1.5 MW Santa Fe Community College Solar project in Santa Fe County, New Mexico is online. The project is sited on 5.4 acres on campus, and consists of 4,620 SunPower 327-Watt photovoltaic modules mounted on fixed racking.  The power generated is used on-site at the Santa Fe Community College campus, generating approximately 43% of the college’s electricity demands, and saving the college more than $200,000 annually.  

Connecticut Municipal Electric Energy Cooperative’s 10 MW oil-fired Matlack Road Microgrid project in New London County, CT is online.  CMEEC supplies power and related electric services to municipal utilities and other wholesale customers that, in turn, provide electricity to roughly 70,000 residential, commercial/industrial and small business customers across the state.  The $9 million Matlack Road Microgrid project serves as emergency backup power for the Backus Hospital campus and adjacent critical facilities including schools, emergency shelters, fire station, supermarket / pharmacy, public water supply, gas station and a shopping center in the event of a sustained power outage.

Businesses and institutions choose distributed generation for a variety of reasons, but most hope for reduced costs and improved reliability compared to traditional utility service.  Will distributed generation continue to grow in the U.S.?  How will utilities -- and policymakers -- adapt as customers continue to adopt consumer-sited generation?

June 24, 2010 - FPL's De Soto Next Generation Solar facility; Patriot Renewables and Maine wind

In past entries, I've looked at FPL's Martin Next Generation Solar Energy Center, which will combine solar thermal energy with existing steam boilers to power combined-cycle turbines.  As it turns out, FPL and its NextEra siblings already operate the largest solar photovoltaic power plant in the United States: the 25-megawatt DeSoto Next Generation Solar Energy Center. At DeSoto, over 90,500 PV panels are projected to generate about 42,000 megawatt-hours annually, enough power to serve about 3,000 homes.  Over 30 years, the DeSoto facility's generation will decrease fossil-fuel usage by approximately 7 billion cubic feet of natural gas and 277,000 barrels of oil.  This shift will displace more than 575,000 tons of greenhouse gas emissions, equivalent of removing more than 4,500 cars from the road every year for the entire life of the project.

How about costs?  The DeSoto facility cost $150 million to construct (and was $22 million under budget).  This translates roughly into a capital cost of 12 cents per kWh over the 30-year lifetime of the plant.

In Maine renewable news, the Lewiston Sun Journal reports that a petition is circulating in Dixfield that asks to leave wind siting decisions to a vote of the townspeople.  The second of two successive six-month moratorium periods will end this fall.  Dixfield wind energy isn't just a hypothetical situation; Massachusetts-based Patriot Renewables LLC has proposed developing the wind energy potential on Colonel Holman Mountain and its surrounding ridges.  Patriot Renewables also has a project proposed in nearby Carthage and Woodstock. (Woodstock and Carthage have both rejected moratoria recently.)  The area is also home to proposed projects by First Wind and Independence Wind in Rumford and Roxbury.  (Thanks to Mike Novello for straightening me out on the projects in this area of Maine.)