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September 1, 2020


Carbon Storage Requirements in the 45Q Tax Credit


The Internal Revenue Code Section 45Q tax credit is
intended to promote investment in carbon capture and
sequestration (CCS), a process designed to reduce
emissions of greenhouse gases (GHGs) from power plants
and other industrial sources. Geologic sequestration of
carbon dioxide (C02), a type of carbon storage, is a process
aiming to permanently store the captured gases deep
underground. The Section 45Q tax credit can be claimed for
the capture and sequestration of carbon oxides, categorized
as (1) CO2 captured directly from industrial facilities
originally placed in service before February 9, 2018; (2)
CO2  and other carbon oxides captured directly from
industrial facilities originally placed in service on or after
February 9, 2018; and (3) CO2 captured directly from the
ambient air (direct air capture). In 2020, Section 45Q
provides tax credits of $31.77 per ton for carbon oxide that
is geologically sequestered and $20.22 per ton for carbon
oxide that is sequestered during enhanced oil recovery
(EOR), or used in other qualified industrial processes.
These tax credits increase to $50 and $35 per ton,
respectively, by 2026.

In June 2020, the Internal Revenue Service (IRS) issued a
notice of proposed rulemaking, Credit for Carbon Oxide
Sequestration, which includes proposed requirements for
demonstrating the secure geological storage of carbon
oxides in underground formations needed to qualify for
45Q  tax credits (85 Federal Register 34050). Section 45Q
and this proposed rule cover a larger set of chemical
substances (i.e., carbon oxides) compared to some other
federal GHG-related rules, which specifically target CO2.

Scure Geological  Stora',ge\ in 45Q
Section 45Q tax credits were enacted as part of the Energy
Extension and Improvement Act of 2008 (P.L. 110-343,
Division B). Section 45Q(f)(2) of the act required the
Department of the Treasury, in consultation with the
Environmental Protection Agency (EPA), the Department
of Energy, and the Department of the Interior, to establish
regulations for the secure geological storage of qualified
carbon oxide to prevent release into the atmosphere.
Further, the provision defined secure geological storage
locations to include deep saline formations, oil and gas
reservoirs, and unmineable coal seams, under conditions
as determined in regulations. Secure geological storage is
required whether the taxpayer is claiming the credit for
carbon oxides used as a tertiary injectant and consequently
stored during EOR operations or injected into underground
formations solely for geologic sequestration.

Cnnection to EPA's Grenhouse Gas
Reorting rogram            Requirements
In 2009, IRS Notice 2009-83 provided interim guidance on
specific requirements for secure geological storage, pending


issuance of regulations. The guidance established that
taxpayers claiming the 45Q tax credits must demonstrate
secure geological storage by calculating the amount of CO2
at the source of capture using methodologies contained in
EPA's  2009 Mandatory Reporting of Greenhouse Gases
Rule (40 C.F.R. Part 98). This rule does not regulate GHG
emission levels but requires facilities designated as GHG
sources to report annual GHG emissions as part of EPA's
Greenhouse  Gas Reporting Program (GHGRP)   and to
follow monitoring, recordkeeping, and verification
requirements. Title 40, Part 98, Subparts RR and UU, of the
Code ofFederal  Regulations, added in 2010, apply to GHG
sources associated with the underground injection and
sequestration of CO2.

S ub partk R R
Subpart RR applies to facilities with wells that inject CO2
for long-term geologic sequestration. This includes all wells
classified by EPA as Underground Injection Control (UIC)
Class VI geologic sequestration wells. The facilities must
calculate and report (1) the mass of CO2 received; (2) the
mass of CO2 injected into the subsurface; (3) the mass of
CO2 produced  (mixed with produced oil, gas, or other
fluids); (4) the mass of CO2 emitted by surface leakage; (5)
the mass of CO2 emitted as equipment leakage or vented
from surface equipment; (6) the mass of CO2 sequestered in
subsurface geologic formations; and (7) the cumulative
mass of CO2 sequestered since the start of required
reporting. Subpart RR also requires facilities to submit a
proposed monitoring, reporting, and verification (MRV)
plan meeting certain requirements to EPA (Table 1). Once
approved, EPA  issues a final MRV plan.

Table  I. Subpart RR MRV   Plan Requirements
*     Delineation of the maximum and active monitoring areas
*     Identification of potential COz leakage pathways in the
      maximum monitoring area and the likelihood, magnitude,
      and timing of surface leakage through these pathways
 * Strategy  to detect and quantify C02 surface leakage
 *    Strategy to establish the expected baselines for
      monitoring CO surface leakage
  *   Considerations intended to be used to calculate site-
      specific variables in the mass balance equation
 * UIC well   number, if permitted under the UIC program
 *    Proposed date to begin collecting data for calculating the
      total amount of CO, sequestered
Source: 40 C.F.R. Part 98, Subpart RR.

From  2016, the first year of reporting, through 2018, the
latest year for which GHGRP data are available, five
facilities injecting CO2 have reported CO2 data to EPA
under Subpart RR. This includes one facility in Illinois


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