18 Cfr 37

18 CFR Part 37 (up to date as of 5/13/2024)
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18 CFR Part 37 (May 13, 2024)

This content is from the eCFR and is authoritative but unofficial.

Title 18 —Conservation of Power and Water Resources
Chapter I —Federal Energy Regulatory Commission, Department of Energy
Subchapter B —Regulations Under the Federal Power Act
Part 37 Open Access Same-Time Information Systems
§ 37.1 Applicability.
§ 37.2 Purpose.
§ 37.3 Definitions.
§ 37.4 [Reserved]
§ 37.5 Obligations of Transmission Providers and Responsible Parties.
§ 37.6 Information to be posted on the OASIS.
§ 37.7 Auditing Transmission Service Information.
§ 37.8 Obligations of OASIS users.

PART 37—OPEN ACCESS SAME-TIME INFORMATION SYSTEMS
Authority: 16 U.S.C. 791-825r, 2601-2645; 31 U.S.C. 9701; 42 U.S.C. 7101-7352.
Source: Order 889, 61 FR 21764, May 10, 1996, unless otherwise noted.

§ 37.1 Applicability.
This part applies to any public utility that owns, operates, or controls facilities used for the transmission of electric
energy in interstate commerce and to transactions performed under the pro forma tariff required in part 35 of this
chapter.

§ 37.2 Purpose.
(a) The purpose of this part is to ensure that potential customers of open access transmission service
receive access to information that will enable them to obtain transmission service on a nondiscriminatory basis from any Transmission Provider. These rules provide standards of conduct and
require the Transmission Provider (or its agent) to create and operate an Open Access Same-time
Information System (OASIS) that gives all users of the open access transmission system access to the
same information.
(b) The OASIS will provide information by electronic means about available transmission capability for pointto-point service and will provide a process for requesting transmission service. OASIS will enable
Transmission Providers and Transmission Customers to communicate promptly requests and responses
to buy and sell available transmission capacity offered under the Transmission Provider's tariff.

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§ 37.3 Definitions.
(a) Transmission Provider means any public utility that owns, operates, or controls facilities used for the
transmission of electric energy in interstate commerce.
(b) Transmission Customer means any eligible customer (or its designated agent) that can or does execute a
transmission service agreement or can or does receive transmission service.
(c) Responsible party means the Transmission Provider or an agent to whom the Transmission Provider has
delegated the responsibility of meeting any of the requirements of this part.
(d) Reseller means any Transmission Customer who offers to sell transmission capacity it has purchased.
(e) Wholesale merchant function means the sale for resale of electric energy in interstate commerce.
(f) Affiliate means:
(1) For any exempt wholesale generator, as defined under section 32(a) of the Public Utility Holding
Company Act of 1935, as amended, the same as provided in section 214 of the Federal Power Act;
and
(2) For any other entity, the term affiliate has the same meaning as given in § 161.2(a) of this chapter.
[Order 889, 61 FR 21764, May 10, 1996, as amended by Order 889-A, 62 FR 12503, Mar. 14, 1997]

§ 37.4 [Reserved]
§ 37.5 Obligations of Transmission Providers and Responsible Parties.
(a) Each Transmission Provider is required to provide for the operation of an OASIS, either individually or
jointly with other Transmission Providers, in accordance with the requirements of this Part. The
Transmission Provider may delegate this responsibility to a Responsible Party such as another
Transmission Provider, an Independent System Operator, a Regional Transmission Group, or a Regional
Reliability Council.
(b) A Responsible Party must provide access to an OASIS providing standardized information relevant to the
availability of transmission capacity, prices, and other information (as described in this part) pertaining to
the transmission system for which it is responsible.
(c) A Responsible Party may not deny or restrict access to an OASIS user merely because that user makes
automated computer-to-computer file transfers or queries, or extensive requests for data.
(d) In the event that an OASIS user's grossly inefficient method of accessing an OASIS node or obtaining
information from the node seriously degrades the performance of the node, a Responsible Party may limit
a user's access to the OASIS node without prior Commission approval. The Responsible Party must
immediately contact the OASIS user to resolve the problem. Notification of the restriction must be made
to the Commission within two business days of the incident and include a description of the problem. A
closure report describing how the problem was resolved must be filed with the Commission within one
week of the incident.
(e) In the event that an OASIS user makes an error in a query, the Responsible Party can block the affected
query and notify the user of the nature of the error. The OASIS user must correct the error before making
any additional queries. If there is a dispute over whether an error has occurred, the procedures in
paragraph (d) of this section apply.
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(f) Transmission Providers must provide “read only” access to the OASIS to Commission staff and the staffs
of State regulatory authorities, at no cost, after such staff members have complied with the requisite
registration procedures.
[Order 889, 61 FR 21764, May 10, 1996, as amended by Order 605, 64 FR 34124, June 25, 1999; Order 638, 65 FR 17400, Mar. 31,
2000; Order 676, 71 FR 26212, May 4, 2006]

§ 37.6 Information to be posted on the OASIS.
(a) The information posted on the OASIS must be in such detail and the OASIS must have such capabilities as to
allow Transmission Customers to:
(1) Make requests for transmission services offered by Transmission Providers, Resellers and other providers
of ancillary services, request the designation of a network resource, and request the termination of the
designation of a network resource;
(2) View and download in standard formats, using standard protocols, information regarding the transmission
system necessary to enable prudent business decision making;
(3) Post, view, upload and download information regarding available products and desired services;
(4) Clearly identify the degree to which transmission service requests or schedules were denied or
interrupted;
(5) Obtain access, in electronic format, to information to support available transmission capability
calculations and historical transmission service requests and schedules for various audit purposes; and
(6) Make file transfers and automated computer-to-computer file transfers and queries as defined by the
Standards and Communications Protocols Document.
(b) Posting transfer capability. The available transfer capability on the Transmission Provider's system
(ATC) and the total transfer capability (TTC) of that system shall be calculated and posted for each
Posted Path as set out in this section.
(1) Definitions. For purposes of this section the terms listed below have the following meanings:
(i)

Posted path means any control area to control area interconnection; any path for which service is
denied, curtailed or interrupted for more than 24 hours in the past 12 months; and any path for which
a customer requests to have ATC or TTC posted. For this last category, the posting must continue for
180 days and thereafter until 180 days have elapsed from the most recent request for service over
the requested path. For purposes of this definition, an hour includes any part of an hour during which
service was denied, curtailed or interrupted.

(ii) Constrained posted path means any posted path having an ATC less than or equal to 25 percent of
TTC at any time during the preceding 168 hours or for which ATC has been calculated to be less than
or equal to 25 percent of TTC for any period during the current hour or the next 168 hours.
(iii) Unconstrained posted path means any posted path not determined to be a constrained posted path.
(iv) The word interconnection, as used in the definition of “posted path”, means all facilities connecting
two adjacent systems or control areas.

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(v) Available transfer capability or ATC means the transfer capability remaining in the physical
transmission network for further commercial activity over and above already committed uses, or
such definition as contained in Commission-approved Reliability Standards.
(vi) Total transfer capability or TTC means the amount of electric power that can be moved or transferred
reliably from one area to another area of the interconnected transmission systems by way of all
transmission lines (or paths) between those areas under specified system conditions, or such
definition as contained in Commission-approved Reliability Standards.
(vii) Capacity Benefit Margin or CBM means the amount of TTC preserved by the Transmission Provider
for load-serving entities, whose loads are located on that Transmission Provider's system, to enable
access by the load-serving entities to generation from interconnected systems to meet generation
reliability requirements, or such definition as contained in Commission-approved Reliability
Standards.
(viii) Transmission Reliability Margin or TRM means the amount of TTC necessary to provide reasonable
assurance that the interconnected transmission network will be secure, or such definition as
contained in Commission-approved Reliability Standards.
(2) Calculation methods, availability of information, and requests.
(i)

Information used to calculate any posting of ATC and TTC must be dated and time-stamped and all
calculations shall be performed according to consistently applied methodologies referenced in the
Transmission Provider's transmission tariff and shall be based on Commission-approved Reliability
Standards, business practice and electronic communication standards, and related implementation
documents, as well as current industry practices, standards and criteria. Such calculations shall be
conducted in a manner that is transparent, consistent with anticipated system conditions and
outages for the relevant timeframe, and not unduly discriminatory or preferential.

(ii) On request, the Responsible Party must make all data used to calculate ATC, TTC, CBM, and TRM for
any constrained posted paths publicly available (including the limiting element(s) and the cause of
the limit (e.g., thermal, voltage, stability), as well as load forecast assumptions) in electronic form
within one week of the posting. The information is required to be provided only in the electronic
format in which it was created, along with any necessary decoding instructions, at a cost limited to
the cost of reproducing the material. This information is to be retained for six months after the
applicable posting period.
(iii) System planning studies, facilities studies, and specific network impact studies performed for
customers or the Transmission Provider's own network resources are to be made publicly available
in electronic form on request and a list of such studies shall be posted on the OASIS. A study is
required to be provided only in the electronic format in which it was created, along with any
necessary decoding instructions, at a cost limited to the cost of reproducing the material. These
studies are to be retained for five years.
(3) Posting. The ATC, TTC, CBM, and TRM for all Posted Paths must be posted in megawatts by specific
direction and in the manner prescribed in this subsection.
(i)

Constrained posted paths —
(A) For firm ATC and TTC.

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(1) The posting shall show ATC, TTC, CBM, and TRM for a 30-day period. For this period
postings shall be: by the hour, for the current hour and the 168 hours next following; and
thereafter, by the day. If the Transmission Provider charges separately for on-peak and offpeak periods in its tariff, ATC, TTC, CBM, and TRM will be posted daily for each period.
(2) Postings shall also be made by the month, showing for the current month and the 12
months next following.
(3) If planning and specific requested transmission studies have been done, seasonal
capability shall be posted for the year following the current year and for each year
following to the end of the planning horizon but not to exceed 10 years.
(B) For non-firm ATC and TTC. The posting shall show ATC, TTC, CBM and TRM for a 30-day period
by the hour and days prescribed under paragraph (b)(3)(i)(A)(1) of this section and, if so
requested, by the month and year as prescribed under paragraph (b)(3)(i)(A) (2) and (3) of this
section. The posting of non-firm ATC and TTC shall show CBM as zero.
(C) Updating posted information for constrained paths.
(1) The capability posted under paragraphs (b)(3)(i)(A) and (B) of this section must be
updated when transactions are reserved or service ends or whenever the estimate for the
path changes by more than 10 percent.
(2) All updating of hourly information shall be made on the hour.
(3) When the monthly and yearly capability posted under paragraphs (b)(3)(i)(A) and (B) of
this section are updated because of a change in TTC by more than 10 percent, the
Transmission Provider shall post a brief, but specific, narrative explanation of the reason
for the update. This narrative should include, the specific events which gave rise to the
update (e.g., scheduling of planned outages and occurrence of forced transmission
outages, de-ratings of transmission facilities, scheduling of planned generation outages
and occurrence of forced generation outages, changes in load forecast, changes in new
facilities' in-service dates, or other events or assumption changes) and new values for ATC
on the path (as opposed to all points on the network).
(4) When the monthly and yearly capability posted under paragraphs (b)(3)(i)(A) and (B) of
this section remain unchanged at a value of zero for a period of six months, the
Transmission Provider shall post a brief, but specific, narrative explanation of the reason
for the unavailability of ATC.
(ii) Unconstrained posted paths.
(A) Postings of firm and nonfirm ATC, TTC, CBM, and TRM shall be posted separately by the day,
showing for the current day and the next six days following and thereafter, by the month for the
12 months next following. If the Transmission Provider charges separately for on-peak and offpeak periods in its tariff, ATC, TTC, CBM, and TRM will be posted separately for the current day
and the next six days following for each period. These postings are to be updated whenever the
ATC changes by more than 20 percent of the Path's TTC.
(B) If planning and specific requested transmission studies have been done, seasonal capability
shall be posted for the year following the current year and for each year following until the end
of the planning horizon but not to exceed 10 years.

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(iii) Calculation of CBM.
(A) The Transmission Provider must reevaluate its CBM needs at least every year.
(B) The Transmission Provider must post its practices for reevaluating its CBM needs.
(iv) Daily load. The Transmission Provider must post on a daily basis, its load forecast, including
underlying assumptions, and actual daily peak load for the prior day.
(c) Posting Transmission Service Products and Prices. (1) Transmission Providers must post prices and a summary
of the terms and conditions associated with all transmission products offered to Transmission Customers.
(2) Transmission Providers must provide a downloadable file of their complete tariffs in the same electronic format
as the tariff that is filed with the Commission. Transmission Providers also must provide a link to all of the rules,
standards and practices that relate to transmission services posted on the Transmission Providers' public Web
sites.
(3) Any offer of a discount for any transmission service made by the Transmission Provider must be
announced to all potential customers solely by posting on the OASIS.
(4) For any transaction for transmission service agreed to by the Transmission Provider and a customer, the
Transmission Provider (at the time when ATC must be adjusted in response to the transaction), must post
on the OASIS (and make available for download) information describing the transaction (including: price;
quantity; points of receipt and delivery; length and type of service; identification of whether the transaction
involves the Transmission Provider's wholesale merchant function or any affiliate; identification of what, if
any, ancillary service transactions are associated with this transmission service transaction; and any other
relevant terms and conditions) and shall keep such information posted on the OASIS for at least 30 days.
A record of the transaction must be retained and kept available as part of the audit log required in § 37.7.
(5) Customers choosing to use the OASIS to offer for resale transmission capacity they have purchased must
post relevant information to the same OASIS as used by the Transmission Provider from whom the
Reseller purchased the transmission capacity. This information must be posted on the same display page,
using the same tables, as similar capability being sold by the Transmission Provider, and the information
must be contained in the same downloadable files as the Transmission Provider's own available
capability.
(d) Posting Ancillary Service Offerings and Prices. (1) Any ancillary service required to be provided or offered under
the pro forma tariff prescribed by part 35 of this chapter must be posted with the price of that service.
(2) Any offer of a discount for any ancillary service made by the Transmission Provider must be announced to all
potential customers solely by posting on the OASIS.
(3) For any transaction for ancillary service agreed to by the Transmission Provider and a customer, the
Transmission Provider (at the time when ATC must be adjusted in response to an associated transmission service
transaction, if any), must post on the OASIS (and make available for download) information describing the
transaction (including: date and time when the agreement was entered into; price; quantity; length and type of
service; identification of whether the transaction involves the Transmission Provider's wholesale merchant function
or any affiliate; identification of what, if any, transmission service transactions are associated with this ancillary

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service transaction; and any other relevant terms and conditions) and shall keep such information posted on the
OASIS for at least 30 days. A record of the transaction must be retained and kept available as part of the audit log
required in § 37.7.
(4) Any other interconnected operations service offered by the Transmission Provider may be posted, with the price
for that service.
(5) Any entity offering an ancillary service shall have the right to post the offering of that service on the OASIS
if the service is one required to be offered by the Transmission Provider under the pro forma tariff
prescribed by part 35 of this chapter. Any entity may also post any other interconnected operations
service voluntarily offered by the Transmission Provider. Postings by customers and third parties must be
on the same page, and in the same format, as postings of the Transmission Provider.
(e) Posting specific transmission and ancillary service requests and responses—(1) General rules. (i) All requests for
transmission and ancillary service offered by Transmission Providers under the pro forma tariff, including requests
for discounts, and all requests to designate or terminate a network resource, must be made on the OASIS and
posted prior to the Transmission Provider responding to the request, except as discussed in paragraphs (e)(1)(ii)
and (iii) of this section. The Transmission Provider must post all requests for transmission service, for ancillary
service, and for the designation or termination of a network resource comparably. Requests for transmission
service, ancillary service, and to designate and terminate a network resource, as well as the responses to such
requests, must be conducted in accordance with the Transmission Provider's tariff, the Federal Power Act, and
Commission regulations.
(ii) The requirement in paragraph (e)(1)(i) of this section, to post requests for transmission and ancillary
service offered by Transmission Providers under the pro forma tariff, including requests for
discounts, prior to the Transmission Provider responding to the request, does not apply to requests
for next-hour service made during Phase I.
(iii) In the event that a discount is being requested for ancillary services that are not in support of basic
transmission service provided by the Transmission Provider, such request need not be posted on the
OASIS.
(iv) In processing a request for transmission or ancillary service, the Responsible Party shall post the
same information as required in paragraphs (c)(4) and (d)(3) of this section, and the following
information: the date and time when the request is made, its place in any queue, the status of that
request, and the result (accepted, denied, withdrawn). In processing a request to designate or
terminate the designation of a network resource, the Responsible Party shall post the date and time
when the request is made.
(v) For any request to designate or terminate a network resource, the Transmission Provider (at the time
when the request is received), must post on the OASIS (and make available for download)
information describing the request (including: name of requestor, identification of the resource,
effective time for the designation or termination, identification of whether the transaction involves
the Transmission Provider's wholesale merchant function or any affiliate; and any other relevant
terms and conditions) and shall keep such information posted on the OASIS for at least 30 days. A
record of the transaction must be retained and kept available as part of the audit log required in §
37.7.

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(vi) The Transmission Provider shall post a list of its current designated network resources and all
network customers' current designated network resources on OASIS. The list of network resources
should include the name of the resource, its geographic and electrical location, its total installed
capacity, and the amount of capacity to be designated as a network resource.
(2) Posting when a request for transmission service is denied. (i) When a request for service is denied, the
Responsible Party must provide the reason for that denial as part of any response to the request.
(ii) Information to support the reason for the denial, including the operating status of relevant facilities, must be
maintained for five years and provided, upon request, to the potential Transmission Customer and the Commission's
Staff.
(iii) Any offer to adjust operation of the Transmission Provider's System to accommodate the denied request must
be posted and made available to all Transmission Customers at the same time.
(3) Posting when a transaction is curtailed or interrupted. (i) When any transaction is curtailed or interrupted, the
Transmission Provider must post notice of the curtailment or interruption on the OASIS, and the Transmission
Provider must state on the OASIS the reason why the transaction could not be continued or completed.
(ii) Information to support any such curtailment or interruption, including the operating status of the facilities
involved in the constraint or interruption, must be maintained and made available upon request, to the curtailed or
interrupted customer, the Commission's Staff, and any other person who requests it, for five years.
(iii) Any offer to adjust the operation of the Transmission Provider's system to restore a curtailed or interrupted
transaction must be posted and made available to all curtailed and interrupted Transmission Customers at the
same time.
(f) Posting Transmission Service Schedules Information. Information on transmission service schedules must be
recorded by the entity scheduling the transmission service and must be available on the OASIS for download.
Transmission service schedules must be posted no later than seven calendar days from the start of the
transmission service.
(g) Posting Other Transmission-Related Communications. (1) The posting of other communications related to
transmission services must be provided for by the Responsible Party. These communications may include “want
ads” and “other communications” (such as using the OASIS as a Transmission-related conference space or to
provide transmission-related messaging services between OASIS users). Such postings carry no obligation to
respond on the part of any market participant.
(2) The Responsible Party is responsible for posting other transmission-related communications in conformance
with the instructions provided by the third party on whose behalf the communication is posted. It is the
responsibility of the third party requesting such a posting to ensure the accuracy of the information to be posted.
(3) Notices of transfers of personnel shall be posted as described in § 358.4(c). The posting requirements are the
same as those provided in § 37.7 for audit data postings.

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(4) Logs detailing the circumstances and manner in which a Transmission Provider or Responsible Party exercised
its discretion under any terms of the tariff shall be posted as described in § 358.5(c)(4). The posting requirements
are the same as those provided in § 37.7 for audit data postings.
(h) Posting information summarizing the time to complete transmission service request studies. (1) For each
calendar quarter, the Responsible Party must post the set of measures detailed in paragraph (h)(1)(i) through
paragraph (h)(1)(vi) of this section related to the Responsible Party's processing of transmission service request
system impact studies and facilities studies. The Responsible Party must calculate and post the measures in
paragraph (h)(1)(i) through paragraph (h)(1)(vi) of this section for requests for short-term firm point-to-point
transmission service, requests for long-term firm point-to-point transmission service, and requests to designate a
new network resource or network load. When calculating the measures in paragraph (h)(1)(i) through paragraph
(h)(1)(iv) of this section, the Responsible Party may aggregate requests for short-term firm point-to-point service
and requests for long-term firm point-to-point service, but must calculate and post measures separately for
transmission service requests from Affiliates and transmission service requests from Transmission Customers who
are not Affiliates. The Responsible Party is required to include in the calculations of the measures in paragraph
(h)(1)(i) through paragraph (h)(1)(vi) of this section all studies the Responsible Party conducts of transmission
service requests on another Transmission Provider's OASIS.
(i)

Process time from initial service request to offer of system impact study agreement.
(A) Number of new system impact study agreements delivered during the reporting quarter to
entities that request transmission service,
(B) Number of new system impact study agreements delivered during the reporting quarter to
entities that request transmission service more than thirty (30) days after the Responsible Party
received the request for transmission service,
(C) Mean time (in days), for all requests acted on by the Responsible Party during the reporting
quarter, from the date when the Responsible Party received the request for transmission
service to when the Responsible Party changed the transmission service request status to
indicate that the Responsible Party could offer transmission service or needed to perform a
system impact study,
(D) Mean time (in days), for all system impact study agreements delivered by the Responsible Party
during the reporting quarter, from the date when the Responsible Party received the request for
transmission service to the date when the Responsible Party delivered a system impact study
agreement, and
(E) Number of new system impact study agreements executed during the reporting quarter.

(ii) System impact study processing time.
(A) Number of system impact studies completed by the Responsible Party during the reporting
quarter,
(B) Number of system impact studies completed by the Responsible Party during the reporting
quarter more than 60 days after the Responsible Party received an executed system impact
study agreement,
(C) For all system impact studies completed more than 60 days after receipt of an executed system
impact study agreement, average number of days study was delayed due to transmission
customer's actions (e.g., delays in providing needed data),
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(D) Mean time (in days), for all system impact studies completed by the Responsible Party during
the reporting quarter, from the date when the Responsible Party received the executed system
impact study agreement to the date when the Responsible Party provided the system impact
study to the entity who executed the system impact study agreement, and
(E) Mean cost of system impact studies completed by the Responsible Party during the reporting
quarter.
(iii) Transmission service requests withdrawn from the system impact study queue.
(A) Number of transmission service requests withdrawn from the Responsible Party's system
impact study queue during the reporting quarter,
(B) Number of transmission service requests withdrawn from the Responsible Party's system
impact study queue during the reporting quarter more than 60 days after the Responsible Party
received the executed system impact study agreement, and
(C) Mean time (in days), for all transmission service requests withdrawn from the Responsible
Party's system impact study queue during the reporting quarter, from the date the Responsible
Party received the executed system impact study agreement to date when request was
withdrawn from the Responsible Party's system impact study queue.
(iv) Process time from completed system impact study to offer of facilities study.
(A) Number of new facilities study agreements delivered during the reporting quarter to entities
that request transmission service,
(B) Number of new facilities study agreements delivered during the reporting quarter to entities
that request transmission service more than thirty (30) days after the Responsible Party
completed the system impact study,
(C) Mean time (in days), for all facilities study agreements delivered by the Responsible Party
during the reporting quarter, from the date when the Responsible Party completed the system
impact study to the date when the Responsible Party delivered a facilities study agreement, and
(D) Number of new facilities study agreements executed during the reporting quarter.
(v) Facilities study processing time.
(A) Number of facilities studies completed by the Responsible Party during the reporting quarter,
(B) Number of facilities studies completed by the Responsible Party during the reporting quarter
more than 60 days after the Responsible Party received an executed facilities study agreement,
(C) For all facilities studies completed more than 60 days after receipt of an executed facilities
study agreement, average number of days study was delayed due to transmission customer's
actions (e.g., delays in providing needed data),
(D) Mean time (in days), for all facilities studies completed by the Responsible Party during the
reporting quarter, from the date when the Responsible Party received the executed facilities
study agreement to the date when the Responsible Party provided the facilities study to the
entity who executed the facilities study agreement,
(E) Mean cost of facilities studies completed by the Responsible Party during the reporting quarter,
and
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(F) Mean cost of upgrades recommended in facilities studies completed during the reporting
quarter.
(vi) Service requests withdrawn from facilities study queue.
(A) Number of transmission service requests withdrawn from the Responsible Party's facilities
study queue during the reporting quarter,
(B) Number of transmission service requests withdrawn from the Responsible Party's facilities
study queue during the reporting quarter more than 60 days after the Responsible Party
received the executed facilities study agreement, and
(C) Mean time (in days), for all transmission service requests withdrawn from the Responsible
Party's facilities study queue during the reporting quarter, from the date the Responsible Party
received the executed facilities study agreement to date when request was withdrawn from the
Responsible Party's facilities study queue.
(2) The Responsible Party is required to post the measures in paragraph (h)(1)(i) through paragraph (h)(1)(vi) of this
section for each calendar quarter within 15 days of the end of the calendar quarter. The Responsible Party will keep
the quarterly measures posted on OASIS for three calendar years.
(3) The Responsible Party will be required to post on OASIS the measures in paragraph (h)(3)(i) through paragraph
(h)(3)(iv) of this section in the event the Responsible Party, for two consecutive calendar quarters, completes more
than twenty (20) percent of the studies associated with requests for transmission service from entities that are not
Affiliates of the Responsible Party more than sixty (60) days after the Responsible Party delivers the appropriate
study agreement. The Responsible Party will have to post the measures in paragraph (h)(3)(i) through paragraph
(h)(3)(iv) of this section until it processes at least ninety (90) percent of all studies within 60 days after it has
received the appropriate executed study agreement. For the purposes of calculating the percent of studies
completed more than sixty (60) days after the Responsible Party delivers the appropriate study agreement, the
Responsible Party should aggregate all system impact studies and facilities studies that it completes during the
reporting quarter.
(i)

Mean, across all system impact studies the Responsible Party completes during the reporting
quarter, of the employee-hours expended per system impact study the Responsible Party completes
during reporting period;

(ii) Mean, across all facilities studies the Responsible Party completes during the reporting quarter, of
the employee-hours expended per facilities study the Responsible Party completes during reporting
period;
(iii) The number of employees the Responsible Party has assigned to process system impact studies;
(iv) The number of employees the Responsible Party has assigned to process facilities studies.
(4) The Responsible Party is required to post the measures in paragraph (h)(3)(i) through paragraph (h)(3)(iv) of this
section for each calendar quarter within 15 days of the end of the calendar quarter. The Responsible Party will keep
the quarterly measures posted on OASIS for five calendar years.
(i)

Posting data related to grants and denials of service. The Responsible Party is required to post data
each month listing, by path or flowgate, the number of transmission service requests that have been
accepted and the number of transmission service requests that have been denied during the prior

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18 CFR 37.7

month. This posting must distinguish between the length of the service request (e.g., short-term or
long-term requests) and between the type of service requested (e.g., firm point-to-point, non-firm
point-to-point or network service). The posted data must show:
(1) The number of non-Affiliate requests for transmission service that have been rejected,
(2) The total number of non-Affiliate requests for transmission service that have been made,
(3) The number of Affiliate requests for transmission service, including requests by the transmission
provider's merchant function to designate a network resource or to procure secondary network service,
that have been rejected, and
(4) The total number of Affiliate requests for transmission service, including requests by the transmission
provider's merchant function to designate, or terminate the designation of, a network resource or to
procure secondary network service, that have been made.
(j) Posting redispatch data.
(1) The Transmission Provider must allow the posting on OASIS of any third party offer to relieve a specified
congested transmission facility.
(2) The Transmission Provider must post on OASIS
(i)

its monthly average cost of planning and reliability redispatch, for which it invoices customers, at
each internal transmission facility or interface over which it provides redispatch service and

(ii) a high and low redispatch cost for the month for each of these same transmission facilities. The
transmission provider must post this data on OASIS as soon as practical after the end of each
month, but no later than when it sends invoices to transmission customers for redispatch-related
services.
(k) Posting of historical area control error data. The Transmission Provider must post on OASIS historical one-minute
and ten-minute area control error data for the most recent calendar year, and update this posting once per year.
[Order 889, 61 FR 21764, May 10, 1996, as amended by Order 889-A, 62 FR 12503, Mar. 14, 1997; Order 605, 64 FR 34124, June
25, 1999; Order 2004, 68 FR 69157, Dec. 11, 2003; Order 890, 72 FR 12493, Mar. 15, 2007; Order 890-A, 73 FR 3111, Jan. 16, 2008;
Order 784, 78 FR 46210, July 30, 2013; Order 676-J, 86 FR 29502, June 2, 2021]

§ 37.7 Auditing Transmission Service Information.
(a) All OASIS database transactions, except other transmission-related communications provided for under §
37.6(g)(2), must be stored, dated, and time stamped.
(b) Audit data must remain available for download on the OASIS for 90 days, except ATC/TTC postings that
must remain available for download on the OASIS for 20 days. The audit data are to be retained and made
available upon request for download for five years from the date when they are first posted in the same
electronic form as used when they originally were posted on the OASIS.
[Order 889, 61 FR 21764, May 10, 1996, as amended by Order 889-A, 62 FR 12504, Mar. 14, 1997; Order 890, 72 FR 12496, Mar. 15,
2007]

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18 CFR 37.8

§ 37.8 Obligations of OASIS users.
Each OASIS user must notify the Responsible Party one month in advance of initiating a significant amount of
automated queries. The OASIS user must also notify the Responsible Party one month in advance of expected
significant increases in the volume of automated queries.
[Order 605, 64 FR 34124, June 25, 1999]

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