Hatteras Island power outage and response

North Carolina's Hatteras Island experienced a power outage last week when construction activity damaged two underground transmission cables serving the island.  While the damage is repaired, residents face mandatory power conservation rules and visitors have been evacuated.

Hatteras Island is a barrier island located in North Carolina's Outer Banks.  While the island is relatively far offshore, it is connected to the northern Outer Banks islands by the Bonner Bridge.  Hatteras Island's roughly 4,000 residents and tens of thousands more seasonal visitors are supplied electricity by Cape Hatteras Electric Cooperative, a member-owned, not-for-profit electric distribution cooperative.

According to the cooperative, on July 27 a contractor building a replacement for the Bonner Bridge "accidentally drove a steel casing through the cooperative’s transmission cables" at the south side of the bridge.  The cooperative says it is taking steps toward both temporary and permanent solutions. For now, it is using a permanent diesel generator in the village of Buxton as well as temporary backup diesels to provide power to the island and is "working to expand the temporary generation service on Hatteras Island in order to accommodate a staged reentry of visitors." Meanwhile, the cooperative is working to splice the damaged underground cable and to build a new overhead transmission line, so permanent transmission service can be restored.

Calling the incident an "unprecedented complete loss of power delivery to Hatteras Island," Dare County issued a mandatory evacuation order for all visitors to Hatteras Island effective July 29, citing "life safety issues from the loss of reliable electrical power on Hatteras Island and growing uncertainty as to when repairs to the main transmission line will be completed to enable restoration of full power to the island."  Estimates suggested over 10,000 visitors have been kept off Hatteras Island as a result of the evacuation order, with proper credentials required for reentry.

According to the county's website, a complete repair might take from one to two weeks.  The county notes that the on-island diesel generators "will only be able to run if load is at minimal levels and everyone is conserving." The county cites mandatory power and water conservation measures in effect, including a requirement to disconnect system circuit breakers for air conditioning systems and hot tub heaters.

Restoring old mill hydro sites and FERC licensure

Suppose you own an existing water powered mill complex whose hydromechanical facilities have not been operational for decades.  You would like to develop a hydropower project at the site, using the existing dam, headrace, and headgates, plus new equipment including two small generators, penstocks, and appurtenant facilities, to provide electricity to your home and workshop.  Do you need a license from the Federal Energy Regulatory Commission?

In the case of the Egnaczak Net Zero Hydro Project proposed for the outlet of the Hoosic River in Cheshire, Massachusetts, the FERC concluded that section 23(b)(1) of the Federal Power Act requires that project's owners to obtain a license for the project's construction, maintenance, and operation.  Proposed by Kenneth and Susan Egnaczak, the Egnaczak Net Zero Hydro Project would have a total generating capacity of 10.7 kilowatts.

Pursuant to section 23(b)(1) of the Federal Power Act, a non-federal hydroelectric project must be licensed (unless it has a still-valid pre-1920 federal permit) if it:

(a) is located on a navigable water of the United States;
(b) occupies lands or reservations of the United States;
(c) utilizes surplus water or waterpower from a government dam; or
(d) is located on a stream over which Congress has Commerce Clause jurisdiction, is constructed or modified on or after August 26, 1935, and affects the interests of interstate or foreign commerce.

The fourth prong itself has three main elements: project located on a Commerce Clause stream, post-1935 construction or modification, affecting interstate commerce.  In this case, FERC concluded that the Egnaczak project satisfied the fourth prong.

First, FERC found that the Egnaczak project is located on a Commerce Clause stream.  Under a 1965 Supreme Court ruling, for purposes of Federal Power Act section 23(b)(1), Commerce Clause streams are the headwaters and tributaries of navigable waters of the United States.  While FERC declined to determine whether the Hoosic River is navigable at the site of the project, it concluded that downstream segments of the Hoosic are navigable, as is the Hudson River into which the Hoosic flows.

Second, FERC next found that installing new hydroelectric generating capacity constitutes post-1935 construction within the meaning of Federal Power Act section 23(b)(1). 

Third, FERC found that the project would offset both electrical and heating needs that would have been otherwise supplied by the interstate grid -- and thus that the project would affect the interests of interstate commerce.  A footnote notes, "It is well settled that small hydroelectric projects that are connected to the interstate grid affect interstate commerce by displacing power from the grid, and the cumulative effect of the national class of these small projects is significant for purposes of FPA section 23(b)(1)."

FERC concluded that because the project would be located on a Commerce Clause stream, would be constructed after 1935, and would affect interstate commerce through its connection to the interstate grid, Section 23(b)(1) of the Federal Power Act requires Kenneth and Susan Egnaczak to obtain a license for the project's construction, maintenance, and operation.  The FERC order also suggests the project may be eligible to obtain an exemption from licensing as a small hydroelectric power project of 10 megawatts or less, and encourages the applicants to investigate the requirements for securing an exemption from licensure.

October 21, 2010 - renewable energy credits

Yesterday, we began a look at RECS: renewable energy credits, or renewable energy certificates.  A REC represents the renewable attributes associated with a particular megawatt-hour of generation.  This approach to placing a higher value on renewable generation as opposed to other technologies works well because electrons are generally fungible, and indeed because power transactions are often “virtual” as opposed to physical deliveries of electrons from a specific generator to a specific consumer.  RECs may thus be sold to any purchaser, even if no power actually changes hands.  In some jurisdictions, RECs may be traded and used for compliance even if the underlying power would not physically be deliverable to the REC buyer.  It is thus important to view RECs as a separate commodity offering renewable generators a new revenue stream.

Each REC contains a broad range of information about its origins: what type of renewable resource produced the power, the date the REC was created, when the renewable generator was built, and the location of the renewable generator.  RECs include this information to allow buyers to make specific claims regarding the nature of the power they consume.  For example, a manufacturer might elect to purchase RECs generated by wind resources in order to market its products as environmentally sustainable.

Because many U.S. states have enacted legislative standards (called Renewable Portfolio Standards, or RPS) requiring certain amounts of utility load served to be sourced from renewable power, RECs also include information on their eligibility for certification for compliance with these state requirements.