Exhibit 99
 
  
 Re:
    
    Estimates of Proved Reserves,Future Production Rates, andFuture Net Revenues for theBP Prudhoe Bay Royalty TrustAs of December 31, 2010
    Two Houston Center 909 Fannin Street, Suite 1300 Houston Texas 77010
 Telephone 713-651-9455 Telefax 713-654-9914 e-mail: mail@millerandlents.com




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The Bank of New York Mellon Trust Company, N.A.
    
    February 18, 2011Trustee, BP Prudhoe Bay Royalty Trust
    
    Page 2
      1.
    
    A large body of basic data and detailed analyses are available and were used
in making the
estimates. In our judgment, the quantity and quality of currently available data
on reservoir boundaries, original fluid contacts, and reservoir rock and fluid
properties are sufficient to indicate that any future revisions to the estimates
of total original in-place volumes should be minor. Furthermore, the data and
analyses on recovery factors and future production rates are sufficient to support
the Proved Reserves estimates.2.
    
    Proved Reserves were estimated generally by extrapolation of
well-established historical
production performance trends and/or were supported by other geologic and
engineering studies. Where sufficient performance data did not exist, reserves
were estimated by volumetric calculations, simulations, or by analogy to similar
producing areas of the field. The methods and procedures employed to accumulate
and evaluate the necessary




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The Bank of New York Mellon Trust Company, N.A.
    
    February 18, 2011Trustee, BP Prudhoe Bay Royalty Trust
    
    Page 3
 information and to estimate, document, and reconcile reserves, annual production
rate forecasts, and future net revenues are effective and appropriate.
 3.
    
    Based on our limited independent tests of the computations of reserves,
production
flowstreams, and Future Net Revenues, such computations were performed in
accordance with the methods and procedures described to us and conform to the
relevant SEC definitions.4.
    
    The estimated net remaining Proved Reserves attributable to the BP Prudhoe
Bay Royalty
Trust as of December 31, 2010, of 78.275 million barrels of oil and condensate
are, in the aggregate, reasonable. Of the 78.275 million barrels of total Proved
Reserves, 67.401 million barrels are Proved Developed Reserves, and 10.874 million
barrels are Proved Undeveloped Reserves.5.
    
    The 2010 average West Texas Intermediate price of $79.43 per barrel,
applicable under
current SEC regulations, represents the twelve-month average of the
first-day-of-the-month price for each month within the twelve month period prior
to December 31, 2010. Based on this price, other economic parameters as prescribed
by the Overriding Royalty Conveyance, and utilizing the specified procedures
outlined in Financial Accounting Standards Board Accounting Standards Codification
932, Extractive Activities  Oil and Gas, BP Exploration (Alaska) Inc. calculated
that as of December 31, 2010 production of the Proved Reserves will result in
Estimated Future Net Revenues of $1,992.6 million and Present Value of Estimated
Future Net Revenues of $1,186.5 million to the BP Prudhoe Bay Royalty Trust. These
estimates are reasonable.6.
    
    BP Exploration (Alaska) Inc. has undertaken a program of field-wide
infrastructure
renewal, pipeline replacement, and well mechanical improvements. As a consequence
of the required downtime for these activities, and the natural production decline,
BP Exploration (Alaska) Inc.s net production of oil and condensate from Proved
Reserves attributable to the Trust was less than 90,000 barrels per day on an
annual average basis in 2010. BP Exploration (Alaska) Inc. expects that its net
production of oil and condensate from Proved Reserves attributable to the Trust
will be less than 90,000 barrels per day on an average basis for most future
years. The BP Exploration (Alaska) Inc. projection of its future net production of
oil and condensate is reasonable.7.
    
    Production attributable to the BP Prudhoe Bay Royalty Trust will decline
with the BP
Exploration (Alaska) Inc. production. However, the Per Barrel Royalty will not
have a positive value if the West Texas Intermediate Price is less than the sum of
the per barrel Chargeable Costs and per barrel Production Taxes, appropriately
adjusted in accordance with the Overriding Royalty Conveyance. Under such
circumstances, average daily production attributable to the BP Prudhoe Bay Royalty
Trust will have no value and therefore will not contribute to the reserves
regardless of BP Exploration (Alaska) Inc.s net production level.




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The Bank of New York Mellon Trust Company, N.A.
    
    February 18, 2011Trustee, BP Prudhoe Bay Royalty Trust
    
    Page 4
 8.
    
    Based on the SEC-defined 12-month average West Texas Intermediate Price of
$79.43 per
barrel, and Production Taxes and Adjusted Chargeable Costs as prescribed by the
Overriding Royalty Conveyance, the projection that royalty payments will continue
through the year 2027 is reasonable. For the economic conditions and production
forecast as of December 31, 2010 the Per Barrel Royalty will be zero following the
year 2027. Therefore, no reserves are currently attributed to the BP Prudhoe Bay
Royalty Trust after that date. The cessation of production date forecasted by BP
Exploration (Alaska) Inc. exceeds the life of the Prudhoe Bay Royalty Trust.9.
    
    Even if expected reservoir performance does not change, the estimated
reserves, economic
life, and Future Net Revenues attributable to the BP Prudhoe Bay Royalty Trust may
change significantly in the future. This may result from changes in the West Texas
Intermediate Price or from changes in other prescribed variables utilized in
calculations defined by the Overriding Royalty Conveyance.




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The Bank of New York Mellon Trust Company, N.A.
    
    February 18, 2011Trustee, BP Prudhoe Bay Royalty Trust
    
    Page 5




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The Bank of New York Mellon Trust Company, N.A.
    
    February 18, 2011Trustee, BP Prudhoe Bay Royalty Trust
    
    Page 6