January 5, 2006


Via EDGAR, Facsimile and Courier

Mr. Michael Moran
United States Securities and Exchange Commission
Division of Corporation Finance
450 Fifth Street, N.W.
Washington, D.C.  20549-0405

Re:      Endesa S.A. ("Endesa")
         Form 20-F/A for Fiscal Year Ended December 31, 2004
         Filed October 28, 2005
         File No. 333-07654

Dear Mr. Moran:

               We are in receipt of the letter from the Staff of the  Securities
and Exchange  Commission,  dated  December 21, 2005,  regarding the amendment on
Form  20-F/A,  as filed on October 28, 2005 (the "Form  20-F/A"),  to our annual
report on Form 20-F for the year ended  December 31, 2004,  as filed on June 30,
2005 (the "Form  20-F").  For your  convenience,  we have  included  the Staff's
comments below and have keyed our responses accordingly.

               1.   You disclose you have eliminated certain sales and operating
costs  related  to your  electricity  and gas  businesses  citing  they  will be
recorded on a net basis for the purpose of U.S. GAAP  reporting.  Please explain
how the affected sales and purchases are conducted from an operational viewpoint
and why the accounting  treatment for these sales and purchases  between you and
certain  market agents is affected by recently  promulgated  U.S.  GAAP.  Please
provide us with your EITF 99-19 analysis  regarding sales and purchases with all
affected  entities and tell us how you made a determination  in fiscal 2004 that
it is now  appropriate  to report  certain sales and costs on a net basis rather
than gross. In your analysis specifically discuss the collective indicators that
lead  you to  believe  you are not a  principal  in these  arrangements.  Please
include a quantification of the gross sales and purchases with each market agent
and/or  subsidiary  included  in this  recent  adjustment.  We may have  further
comments.

               We have recorded the following items of sales and operating costs
related  to our  electricity and gas  businesses on a  net basis for purposes of




                                                                          Page 2


presenting  our net sales in accordance  with U.S. GAAP as reported in the table
under "Selected Financial Data" in the Form 20-F/A:

     o    amounts   collected  from   consumers  in  connection   with  Endesa's
          electricity  distribution  business  that are in addition to the fixed
          distribution fee set annually by the Spanish  government and, as such,
          constitute  pass-through  items.  These  amounts  totaled  (euro)3,196
          million in 2004;

     o    sales and purchases of electricity  by Endesa in the wholesale  market
          in Spain that constitute intra-company  transactions.  These sales and
          purchases totaled (euro)1,069 million in 2004; and

     o    gas exchange  transactions between Endesa and other gas retailers that
          are  intended  to  facilitate  the  delivery  of  gas to  third  party
          consumers and are not the  culmination  of an earning  process.  These
          transactions totaled (euro)74 million in 2004.

Our  analysis  with  respect  to each of these  items is set  forth  below.  The
adjustments to our net sales in accordance  with U.S. GAAP with respect to these
three items,  as reflected in the Form 20-F/A,  are not prompted by any recently
promulgated  principles  or  guidance.  Rather,  as  stated in our  response  to
Question 3 below,  these  adjustments are the correction of an error in the Form
20-F that was  discovered  after the document was filed with the  Commission  in
connection  with further  analysis of the  reconciliation  of our 2004 financial
results from Spanish GAAP to IFRS. These  adjustments do not affect Endesa's net
income or stockholders' equity under U.S. GAAP.

               Overview of the Electricity Sector in Spain

               We believe that a brief overview of the principal features of the
electricity  sector in Spain and the main actors  involved will  facilitate  the
presentation of our analysis with respect to the three items described above.

               Transactions in the Electricity Sector in Spain

               The  electricity  sector  in  Spain  encompasses   regulated  and
unregulated segments. The diagram below illustrates the various segments and how
they  interact  with  each  other in the  generation,  distribution  and sale of
electricity.




                                                                          Page 3

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     1.   Electricity  generating  companies sell  electricity  into a wholesale
          market  operated  by Operador  del  Mercado  Iberico de Energia - Polo
          Espanol,  S.A.  ("OMEL"),  from  which  electricity  distributors  and
          electricity retailers purchase electricity. OMEL basically operates as
          a clearinghouse in this wholesale  market,  matching supply and demand
          for electricity. As discussed below, OMEL carries out its functions as
          an  agent  for  the   participants  in  the  wholesale  market  (i.e.,
          generating companies, distributors and retailers).

     2.   Electricity  distributors purchase electricity in the wholesale market
          and  deliver  it to  consumers  in  Spain  that  have not  elected  to
          participate in the deregulated market for electricity (i.e., regulated
          customers).  The distributors receive amounts from regulated customers
          as  well  as  distribution  and  transmission  fees  from  electricity
          retailers  at  rates  set by the  Spanish  government,  and  they  are
          permitted to retain only the portion of such amounts that  corresponds
          to  a  fixed   distribution   fee  also  established  by  the  Spanish
          government. The remainder of the amounts received by distributors from
          regulated customers and electricity  retailers must be used to pay the
          cost of the  electricity  purchased  in the  wholesale  market and the
          regulated fee payable to the electricity transmission companies,  with
          any excess  required  to be paid over to the Spanish  National  Energy
          Commission  (Comision  Nacional de Energia)  ("CNE") to cover  certain
          regulatory costs established by the government.




                                                                          Page 4


     3.   Electricity retailers purchase electricity in the wholesale market and
          sell it to consumers in Spain that have elected to  participate in the
          deregulated market for electricity (i.e., deregulated customers).  The
          price paid by deregulated customers is freely agreed between retailers
          and their customers, and retailers earn profits depending on the price
          and volume of the electricity sold and purchased by them.

     4.   The CNE oversees the operation of the electricity  sector in Spain and
          the settlement of transactions  in the regulated  market and is funded
          by any excess collections by electricity  distributors as described in
          2 above.

               Principal Actors in the Electricity Sector

               Electricity Generating Companies

               Electricity  generation  is  a  deregulated  activity  in  Spain.
Generating  companies  sell  electricity  into, and  distribution  and retailers
purchase  electricity  from,  the  wholesale  market  operated by OMEL at market
prices which reflect incurred costs and supply and demand for electricity.

               Endesa  operates  in this  segment of the  electricity  sector in
Spain.

               We believe  that  electricity  generating  companies  function as
primary obligors for purposes of U.S. GAAP because, among other things, they are
primarily responsible for the delivery of electricity to fulfill customer demand
in the  market,  they  are  responsible  for  the  fulfillment  of  any  service
specifications,  they  establish  the price at which  they are  willing  to sell
electricity in the wholesale market and their earnings are directly dependant on
the volume and price of electricity produced.

               Electricity distributors

               As  described  above,  electricity  distribution  is a  regulated
activity in Spain. Each year the Spanish government  establishes the fee payable
to  distributors  for  their  activities.  This fee is  fixed  and does not vary
depending on the quantity or price of the electricity  involved.  The government
sets the fixed fee at the level it deems  necessary  to permit  distributors  to
recover  their  costs,  which  consist  mainly  of the  costs  related  to their
investment in the distribution network and the operation and maintenance of such
investment.

               Distributors  are the only  authorized  collection  agents in the
regulated market.  Under Spanish energy  regulations,  electricity  distributors
collect amounts from regulated  customers both for their own account (i.e.,  the
fixed  distribution  fee  payable to them) and for the  account  of  electricity
generating companies and electricity  transmission  companies.  Distributors are
not permitted to retain any amounts received from regulated customers beyond the




                                                                          Page 5


fixed  distribution  fee,  with any excess  payable to the CNE. In the event the
amount   collected  by  a  distributor  is  insufficient  to  cover  this  fixed
distribution  fee  after  the  distributor  has  settled  with  the  electricity
generating company and the transmission  company, the distributor is entitled to
recover the shortfall from CNE.

               Endesa  operates  in this  segment of the  electricity  sector in
Spain.

               We believe that  distributors  function as agents for purposes of
U.S.  GAAP  because,  among  other  things,  they  earn a fixed  fee  for  their
distribution services  independently of the volume or price of electricity sold,
they cannot  determine  the price for their  services,  they  cannot  choose the
generating  company that supplies the electricity  for a particular  transaction
and they are required to purchase  electricity in the wholesale  market operated
by OMEL.(1).  Electricity  distributors  are not accountable for failures in the
delivery  of  electricity  to  regulated  customers  that  are  attributable  to
electricity  generating or  transmission  companies.  We have  provided  further
analysis of the status of distributors as agents in the discussion below.

               Electricity Retailers

               Electricity  retailers  negotiate  prices for electricity  freely
with  deregulated  customers.  Retailers  purchase  electricity  from generating
companies in the wholesale  market  operated by OMEL at spot market prices,  and
must also pay fixed distribution and transmission fees in order to fulfill their
responsibilities  for services  provided.  Any profit realized by retailers will
depend on the price and volume of the electricity sold and purchased by them.

               We believe that  electricity  retailers are primary  obligors for
purposes  of U.S.  GAAP  because,  among  other  things,  they  are the  primary
responsible  party for the  fulfillment  of  services  provided  to  deregulated
customers,  they agree prices for  electricity  freely with their  customers and
their  earnings  are directly  dependent on the volume and price of  electricity
sold.

               OMEL

               OMEL  is   responsible   for  the   operation  of  the  wholesale
electricity  market in Spain.  OMEL's duties under Spanish law include receiving
purchase and sale offers from distributors,  retailers and generating companies,
matching  these  offers and  notifying,  settling  and  collecting  payments for
electricity  sold in the market.  OMEL is strictly  prohibited  from selling and

- -------------------
(1)  We note that an amendment to Spanish  electricity  regulations was approved
     in  December  2005 that would  permit  distribution  companies  to purchase
     electricity directly from generating companies rather than through OMEL. At
     this time it is not clear what the practical and accounting implications of
     this amendment will be for future periods.




                                                                          Page 6


purchasing   electricity   for  its  own  account,   functioning   solely  as  a
clearinghouse  for transactions in the wholesale  market.  OMEL is entitled to a
fee established annually by the Spanish government and paid directly by the CNE.


               We believe  that OMEL  functions as an agent for purposes of U.S.
GAAP because, among other things, it does not itself determine the price for any
electricity  transaction,  it does  not bear any  credit  risk for  transactions
settled in the wholesale  market,  it is not  responsible for the fulfillment of
any service  specifications  and its earnings are not directly  dependent on the
volumes or prices of electricity sold in the market.

               Regulated Customers

               Regulated customers purchase electricity at rates set annually by
the Spanish government.  The Spanish government seeks to set the applicable rate
based on  expectations  as to the price of electricity in the wholesale  market,
the regulated  fees payable to  distributors  and the  electricity  transmission
companies,  and other amounts needed to finance the operation of the electricity
sector (such as the operation of OMEL and others).

               CNE

               The  CNE  is  an  agency  of  the  Spanish  government  which  is
responsible  for the oversight of the  electricity  sector and the settlement of
transactions (including payments) in the Spanish electricity sector.

               Pass-Through Items in the Electricity Distribution Business

               Background

               As  stated  above,  electricity  consumers  in Spain may elect to
purchase  electricity  directly from retail  companies at mutually agreed prices
(i.e., the deregulated  market) or,  alternatively,  from  distributors at rates
fixed  annually by the Spanish  government  (i.e.,  the regulated  system).  The
regulated system derives its revenues from the price for electricity  charged to
consumers in such regulated system as well as transmission and distribution fees
charged to retail companies with respect to electricity sales in the deregulated
market. These revenues are used to cover the following costs:

     o    the cost of acquiring  electricity from generating companies to supply
          consumers in the regulated system;

     o    transmission fees, which are set annually by the Spanish government;

     o    distribution  fees, which are set annually by the Spanish  government;
          and

     o    other  costs  specified  pursuant to  applicable  law,  including  the
          operating  costs of the CNE, the operating  costs of OMEL, the cost of
          dismantling nuclear power stations and certain other liabilities.




                                                                          Page 7


               Electricity  distributors  collect  amounts from consumers at the
applicable rate set by the Spanish government and settle the related acquisition
costs and fixed  transmission  fees  referred to above.  Such  distributors  are
permitted to retain their fixed  distribution  fees only, the amount of which is
set by the Spanish  government  at the  beginning of each year and does not vary
according to the amount actually  collected by the  distributor  from consumers.
Any excess is required to be  transferred to the CNE to cover the other costs of
the regulated  system.  In the event the amount  collected by a  distributor  is
insufficient  to cover this fixed  distribution  fee after the  distributor  has
settled with the electricity  generating  company and the transmission  company,
the distributor is entitled to recover the shortfall from CNE. Accordingly,  the
costs incurred by electricity  distributors in respect of acquisition  costs and
transmission  fees  and the  other  costs  of the  regulated  system  constitute
pass-through items from the perspective of the distributor.

               The example in the table below shows that,  even where the amount
collected from the consumer and the related  acquisition cost of the electricity
vary, the fee retained by the distributor  remains the same,  since the fee does
not depend on the price or volume of the  electricity  acquired  or the price or
volume of the electricity sold to consumers.




                                                                               
Amount collected:                                                 100        100        120
                                                                  ===        ===        ===

From retailers                                                    10         10         12
                                                                  ==         ==         ==

From regulated consumers                                          90         90         108
                                                                  ==         ==         ===

         Acquisition cost paid to generating company              (40)       (35)       (50)

         Transmission fee set by Spanish government               (10)       (10)       (12)

         Distribution fee set by Spanish government               (30)       (30)       (30)
                                                                  ----       ----       ----

Excess payable to CNE(2)                                          20         25         28



In each of the cases illustrated  above, the only revenue  recordable under U.S.
GAAP would be 30 monetary units, which is the amount invoiced by the distributor
net of the  cost of the  electricity  in the  wholesale  market,  the  regulated
transmission fee and the excess transferred to the CNE.

               Analysis
               --------

- -------------------
(2)  In the case there would not be excess,  then CNE will pay the difference to
     distribution companies.




                                                                          Page 8


               Under Spanish GAAP,  the amount  collected  from  consumers by an
electricity  distributor  is included in the  distributor's  revenues on a gross
basis,  including the  acquisition  cost paid to the generating  company and the
transmission  fee set by the  Spanish  government  and  payable  to  electricity
transmission  companies.  This accounting policy has been adopted universally by
electricity  distributors  in  Spain  and is  based  on the  legal  form  of the
transaction. Under U.S. GAAP, Endesa believes that only the distribution fee set
annually  by the  Spanish  government  -  which  is the  sole  amount  that  the
distributor  is entitled and  permitted to retain - are properly  recognized  as
revenue by the  distributor,  with the remainder of the amount  collected netted
off against the related pass-through operating costs.

               We believe  that our  conclusion  as to the correct  treatment of
these  pass-through items under U.S. GAAP follows from the guidance set forth in
EITF Issue No. 99-19  (Reporting  Revenue Gross as a Principal  versus Net as an
Agent).  Given the fact that electricity  cannot be stored, we believe that many
indicators of gross reporting are not applicable,  especially  those relating to
inventory  holding  and  further  changes  and  specifications  to  the  product
supplied.  Of the various factors analyzed, we believe the following factors are
the strongest indicators of net reporting in our distribution business:

     o    Primary  obligor:  paragraph 15 of EITF 99-19 states that "[w]hether a
          supplier  or a company is  responsible  for  providing  the product or
          service  desired by a customer is a strong  indicator of the company's
          role in the transaction." Electricity distributors are not accountable
          for failures in the  delivery of  electricity  to regulated  customers
          that  are  attributable  to  electricity  generating  or  transmission
          companies.  Electricity distributors in Spain are only responsible for
          the  fulfillment  of the  distribution  services  for  which  they are
          entitled to be  compensated,  and not for any other  activities of the
          system (i.e., generation and transmission),  and therefore do not have
          the risks and rewards of  ownership  for the other  activities  of the
          system.  Accordingly, we believe that we should record revenue related
          to its distribution business solely in respect of those activities for
          which the  company is  responsible  (i.e.,  distribution)  and not for
          those  for  which it is not the  primary  obligor  and is acting as an
          agent.   In   addition,   paragraph  7  of  EITF  99-19  states  that:
          "[r]esponsibility for arranging transportation for the product ordered
          by a customer is not responsibility for fulfillment".

     o    Fixed  earnings:  we note that  paragraph 16 of EITF 99-19 states that
          "[i]f a company earns a fixed dollar  amount per customer  transaction
          regardless  of the amount billed to a customer or if it earns a stated
          percentage of the amount billed to a customer,  that fact may indicate
          that the company is an agent of the supplier and should record revenue
          net based on the amount  retained." As stated above,  the distribution
          of  electricity  is a  regulated  business in Spain,  and  electricity
          distributors  are  permitted to retain their fixed  distribution  fees
          only,  the  amount of which is set by the  Spanish  government  at the
          beginning  of each  year and does not  vary  according  to the  amount
          actually collected by the distributor from a customer. We believe that
          this fact is an indicator  that Endesa is an agent with respect to its
          distribution  business  and  should  record  revenue  net based on the
          amount of the distribution fee retained.




                                                                          Page 9


               The table below  discloses the amount by which Endesa's net sales
in 2000 to 2004 under U.S. GAAP have been reduced from the corresponding figures
under  Spanish GAAP due to the netting of amounts  collected  from  consumers in
Endesa's  electricity  distribution  business  that are in addition to the fixed
distribution fee set annually by the Spanish government and, as such, constitute
pass-through items:




Year-end ((euro) million)                           2000      2001       2002       2003       2004
                                                                             

Pass-Through  Items  in the  Electricity
Distribution Business                               2,852     2,967      3,326      3,243      3,196
                                                    -----     -----      -----      -----      -----



               Intra-Company Transactions in the Wholesale Market

               Background

               Since  1998,  purchases  and sales of  electricity  in Spain have
occurred through a wholesale market operated by OMEL. Generating companies offer
to sell electricity to this market in "generating units" by time slots. In turn,
distributors  and retailers  notify OMEL of the estimated  requirements of their
consumers for each time slot. OMEL determines  which generators will deliver the
electricity  required to cover the projected demand,  and selects the generating
units  offered at the lowest  price.  The  highest  price at which the  selected
generating  units are offered (i.e.,  marginal price) is then used to settle all
sales of electricity in the wholesale market for the relevant time slot.(3)

               OMEL's  sole  function is to organize  the  wholesale  market and
match  sale  and  purchase  bids.  Furthermore,  as  established  by  applicable
regulations  and  OMEL's own  by-laws,  OMEL does not act as a  counterparty  to
sellers or buyers in the  wholesale  market.  The only  parties  involved in the
transactions  conducted  in this  market  are the  agents  who act as  buyers or
sellers. Accordingly, OMEL does not record any electricity sales or purchases as
revenue.  OMEL's duties,  as established under applicable law, include receiving
sale and acquisition offers,  matching these offers and notifying,  settling and
collecting payments corresponding to the final price of the consumed energy.

               The above is  expressly  provided  for in  Article  33 of the Law
Governing  the  Electricity  Sector,  which  establishes  that OMEL "assumes the

- -------------------
(3)  The Spanish  system also includes an intra-day  market and a  supplementary
     services  market,  which covers the variances  between  actual and expected
     supply and demand in the daily  market and the  supplies  required,  from a
     technical standpoint, to guarantee the correct functioning of the system.




                                                                         Page 10


management of the system in place for offers to purchase and sell  electricity,"
receives  the  offers  to  sell  and  acquire  electricity,   and  accepts  "the
corresponding  guarantees,  as the case may be,"  matches the sale and  purchase
offers  "based on the lowest  offer  until the amount of demand is met" and,  in
short,  with  the  co-opeation  of  the  System  Operator,  proceeds  with  "the
liquidation and notification of payments and payment  collections  which must be
made according to the final energy price."

               Furthermore,   Article  22  of  Royal  Decree  2019/1997,   which
establishes and regulates the electricity generation market, also refers to OMEL
as the party  responsible  for the  management  of this market,  whereby OMEL is
responsible  for settling and  notifying any payment  obligations  and rights to
collect  payment  resulting  from  transactions  carried out in the  electricity
generation  market,  including by  determining  the price and final amount to be
paid by the  purchaser  as well as the price and  amount to be  received  by the
vendors.  In  sum,  therefore,   OMEL  is  a  mere  market  manager,  acting  as
intermediary  between the  purchasers  and vendors,  but not does act in its own
name or on its own behalf in the purchase or sale of electricity.

               In accordance with the by-laws  (Article 2), the corporate object
of OMEL is, in summary,  to ensure the adequate  operation of the system, and it
acts exclusively as the manager of the process to match the electricity supplies
and demand of third  parties,  and as liquidator  of the economic  flows in such
market,  and under no  circumstances  may it intervene as a party or  interested
party in the  transactions  or sale and purchase of electricity  that take place
through such market.

               Generating  companies  receive the full amount paid by purchasers
of electricity in the wholesale  market,  as OMEL is not permitted to retain any
amount in  connection  with  purchase  and sale  transactions.  The only revenue
obtained by OMEL is an amount set annually by the Spanish  government,  which is
paid to OMEL by the CNE from  amounts  collected  by  distributors  as described
above.

               All  invoices  issued by and paid to OMEL are  issued and paid on
behalf and for the  account of the buyers and sellers who operate in the market.
In accordance  with  applicable  regulations,  amounts  related to purchases and
sales of electricity in the wholesale market are paid into an account maintained
by OMEL for the benefit of market  participants,  which is subject to the regime
for the conduct of third-party  business.  These regulations stipulate that this
account shall in no  circumstances  form part of OMEL's assets and  liabilities.
This point is expressly  contained in another rule  governing the market:  "22.5
Account designated by OMEL for payments and deposits. OMEL will designate a cash
account  at the Bank of  Spain or in a  domestic  bank or  savings  bank for the
purposes  established  in these Rules.  This account will be opened by OMEL as a
deposit  account  in its own name but in the  interests  of the  market  agents,
according  to the rules  governing  the  management  of third party  businesses,
whereby any balance  contained in the account on an  exceptional  basis will not
under any  circumstances  be  included  in  OMEL's  assets.  With  regard to the
balance,  OMEL is the only party that can order any  debits or  deposits  in the
account corresponding to the settlement of amounts corresponding to transactions
carried out  through  the  electricity  generation  market,  in the terms of the
preceding sections."




                                                                         Page 11


               OMEL  does  not  assume  any  technical  or  financial   risk  in
connection with the operation of the wholesale  electricity market. The solvency
of the market is safeguarded by the  guarantees  that  purchasers of electricity
must  provide  to  cover  their  positions  and  guarantee  amounts  payable  to
generating  companies.  Notably,  when a group  operates in the market as both a
purchaser  and a seller of  electricity  through  separate  subsidiaries,  it is
required to provide  these  guarantees  for the group's net position  only.  The
rules governing the market specify that, apart from debit and credit notes, OMEL
will  issue,  in the name and on behalf  of  electricity  generating  companies,
invoices and documents  corresponding to the settlement of amounts corresponding
to transactions in the market.

               Endesa operates in the wholesale  electricity  market in Spain as
both a seller and a purchaser of electricity  through various  subsidiaries.  In
the case of purchases and sales of electricity  carried out by  subsidiaries  of
Endesa  in the same time slot and at the same  price,  title to the  electricity
generated by one  subsidiary of Endesa and sold to another  subsidiary of Endesa
for resale to the end customer is at no time transferred to any third party, and
no third party assumes any risk for this electricity at any time.

               Analysis
               --------

               Companies  like Endesa that are both a seller and a purchaser  of
electricity  in the wholesale  market  recognize  revenues under Spanish GAAP in
respect  of their  sales to the  market  even where  another  subsidiary  of the
company  simultaneously  purchases  electricity in the same time slot and at the
same price.  This  accounting  policy has been adopted  universally by companies
that both generate and distribute electricity in Spain and is based on the legal
form of the  transaction.  As a result,  under Spanish GAAP such companies would
record an item of revenue for the sale of electricity into the wholesale market,
an expense for the purchase  made from the market at the same time and price and
another item of revenue for sales to the end customer.

               Under U.S.  GAAP,  the revenue and related  expense from the sale
and purchase of electricity by subsidiaries  of Endesa at the same market,  time
and price must be eliminated as intra-company  transactions  since, as mentioned
earlier,  no third  party  has owned or  assumed  any risk or  opportunity  with
respect to such  electricity.  In this regard,  we note that, in accordance with
the  guidance in EITF 99-19 and the facts set forth above,  OMEL  operates as an
agent  in  the  wholesale   electricity   market  and  therefore  is  merely  an
intermediary for purposes of transactions  between market  participants (in this
case, a transaction  between two subsidiaries of Endesa) as is clearly stated in
the Spanish legislation governing OMEL.

               For the reasons set forth above,  we consider  that OMEL operates
as an agent in the  wholesale  electricity  market  and  therefore  is merely an
intermediary   for  purposes  of  transactions   between  market   participants,
consequently  we  believe  that  these  transactions   represents   intercompany
transactions that should be eliminated on consolidation.


               The table below  discloses the amount by which Endesa's net sales
in 2000 to 2004 under U.S. GAAP have been reduced from the corresponding figures




                                                                         Page 12


under Spanish GAAP due to the netting of sales by Endesa in the wholesale market
that  coincided  with purchases made by it in the same time slot and at the same
price:




Year-end ((euro) Million)                                  2000      2001       2002       2003       2004
                                                                                       

Intra-Company Transactions in the Wholesale Market(4)       844       885      1,095        981      1,069



               After  eliminating  the  pass-through   items  and  intra-company
transactions described above, Endesa's net sales under U.S. GAAP with respect to
its activities in the Spanish electricity sector consist mainly of:

                    o    Revenues from the sale of  electricity by Endesa in the
                         wholesale  market  in  its  capacity  as  a  generating
                         company for  delivery  to  regulated  customers  (i.e.,
                         electricity sold to distributors);

                    o    Revenues from the sale of  electricity by Endesa in the
                         wholesale  market  in  its  capacity  as  a  generating
                         company for delivery to retailers not  affiliated  with
                         Endesa;

                    o    Revenues from the fixed  distribution  fees received by
                         Endesa in its capacity as a distributor  from retailers
                         and regulated customers;

                    o    Revenues from the sale of  electricity by Endesa in its
                         capacity as a retailer to deregulated customers.

               Gas Exchange Transactions

               Background
               ----------

               Spain has  virtually no domestic  gas  production  and  therefore
depends on imports to fulfill its  requirements  for gas. These imports are made
either  through gas pipelines or, mainly,  in the form of liquefied  natural gas
(LNG),  which has to be re-gasified and stored for subsequent  transport through
the existing basic gas-pipeline networks in the Iberian Peninsula.  Since access
to the gas import  infrastructures  in Spain is  limited,  gas import  agents in
Spain (i.e.,  retailers),  as is the case in other  countries,  take contractual
steps aimed at minimizing the risks  resulting from the operation of the Spanish

- ----------------------
(4)  Purchases of  electricity  by Endesa's  distribution  subsidiaries  did not
     affect these amounts since these subsidiaries'  purchases are not reflected
     as  operating  costs  under U.S.  GAAP  because the only  revenue  recorded
     relates  to the  fixed  distribution  fee and all  other  transactions  are
     recorded on a net basis.




                                                                         Page 13


gas  system.  Thus on the  one  hand  the  retailers  have a more  or less  firm
obligation  to take the LNG  acquired,  re-gasify  it and  store  it  (with  the
concomitant  cost) and, on the other,  the obligation to fulfill customer demand
that can have a highly  variable  component.  The retailers  have to match these
requirements adequately.

               As a means to minimize the  logistical  risks in the  acquisition
and delivery of gas, retailers enter into gas exchange transactions whereby they
deliver gas to, or take delivery of gas from,  another  operator in exchange for
the  receipt or delivery  of the same  quantity of gas at a different  date and,
normally,  at a different place. No monetary  consideration is involved in these
transactions.

               Endesa Energia, a wholly-owned subsidiary of Endesa, arranges gas
exchange  transactions  with other retailers in which gas supplies are exchanged
in order to satisfy orders at different times and places.

               Analysis
               --------

               Under Spanish GAAP these gas  exchanges  were recorded on a gross
basis,  recording  a cost  for the  surrendered  inventory  cost  and an item of
revenue for the same  amount,  therefore  without any impact on our Spanish GAAP
net income but recognizing greater revenues and costs than otherwise.

               The example in the table below shows the journal  entries,  under
Spanish  GAAP,  when  exchanging  gas and how the margin is only recorded at the
time of sale of the  exchanged  products  (in the  same or  another  form)  to a
customer of the company.  However,  both revenues and expenses are accounted for
twice as a result of the exchange.

                                                     Debit            Credit

Gas acquired for further sale to customers
- ------------------------------------------

   Inventory                                          100

   Cash                                                                 100

Gas exchange agreement
- ----------------------

   Inventory                                                            100

   Cost of sales                                      100




                                                                         Page 14


   Accounts receivable                                100

   Revenues                                                             100

   Inventory                                          100

   Accounts receivable                                                  100

Gas previously exchanged sold to customers
- ------------------------------------------

   Revenues                                                             120

   Inventory                                                            100

   Cost of sales                                      100

   Cash                                               120

               As disclosed in the example above,  under Spanish GAAP a total of
220 monetary units have been recorded as revenues and 200 as cost of sales. This
accounting  policy under Spanish GAAP is not appropriate under U.S. GAAP because
such transactions  constitute  exchanges of non-monetary assets. Under U.S. GAAP
these transactions should be recognized at fair value or cost,  according to the
guidance in APB Opinion No. 29 (Accounting  for  Nonmonetary  Transactions).  We
believe that since such exchange is intended to  facilitate  the delivery of gas
to third party  consumers  and does not involve  the  culmination  of an earning
process,  there should not be any effect on earnings or revenues  until the time
of sale of the exchanged products (in the same or another form) to a customer of
the company,  therefore  recording  such  exchange at cost.  Our  conclusion  is
supported  by  paragraph  21 APB  Opinion  No. 29  (Accounting  for  Nonmonetary
Transactions)  since such guidance  considers these transactions to be exchanges
of non-monetary  assets that would not be recognized at fair value, based on the
fact that the inventory  delivered is identical to or substantially  the same as
the  inventory  received and are  exchanges  performed  in the normal  course of
business  to  facilitate  the  sale  to  final  customers.  This  conclusion  is
consistent with our net income approach for our Spanish GAAP accounting policy.




                                                                         Page 15


Therefore,  in the example  above,  the revenues and cost of sales (100 monetary
units) recorded due to the inventory exchange would be excluded so that revenues
(120 monetary  units) and cost of sales (100  monetary  units) would be the only
amounts recorded at the time the inventory is finally sold to a customer.

               As stated above,  Endesa's net sales in 2004 under U.S. GAAP have
been reduced by (euro)74  million from the  corresponding  figure under  Spanish
GAAP due to the  non-recognition  under U.S.  GAAP of gas exchange  transactions
between  Endesa and other gas  retailers  that are  intended to  facilitate  the
delivery  of gas to third  party  consumers  and are not the  culmination  of an
earning  process.  These  transactions  took place for the first time in 2004 so
they were not necessary to adjust sales for prior periods for this item.

               We note the  request in your letter for a  quantification  of our
gross sales and purchases with each market agent and/or  subsidiary  included in
the  adjustment  to our net sales under U.S.  GAAP related to these gas exchange
transactions in the Form 20-F/A. We are providing you with this information in a
separate letter for which confidential treatment is requested.

               2.   Tell us your  consideration of the impact, if any, that EITF
99-19 may have on these sales and  purchase  arrangements  within the context of
adopting EITF 02-3 and 03-11,  both of which were in effect for your fiscal year
2003.  See  paragraphs  19 of EITF 02-3 and 10 of EITF  03-11.  Include  in your
response your  accounting  policy for these sales and purchases  both before and
after you filed your amended Form 20-F.  We note your  disclosure  on page F-116
states the  application of EITF 03-11 had no effect on your financial  position,
cash flows or results of operations.

               EITF  Issue  No.  02-03  (Issues   Involved  in  Accounting   for
Derivative  Contracts Held for Trading Purposes and Contracts Involved in Energy
Trading and Risk  Management  Activities),  requires that all contracts  entered
into for trading  purposes by an entity  involved  in such  activities  ("energy
trading  contracts"),  including  those contracts that are also considered to be
derivatives  pursuant  to SFAS No.  133,  should be  measured  at fair value and
recorded in the  consolidated  balance sheet with gains and losses recorded on a
net basis in  current  earnings..  EITF  02-03  applies  to all  energy  trading
contracts and not just those that meet the definition of a derivative.

               EITF  Issue No.  03-11  (Reporting  Realized  Gains and Losses on
Derivative  Instruments That Are Subject to FASB Statement No. 133 and Not "Held
for Trading  Purposes" as Defined in Issue No. 02-3) considers that  determining
whether  realized gains and losses on physically  settled  derivative  contracts
(whether or not the derivative is designated as a hedging instrument pursuant to
Statement 133) not "held for trading  purposes" should be reported in the income
statement  on a gross or net basis is a matter of judgment  that  depends on the
relevant facts and circumstances. Consideration of the economic substance of the
transaction  as well as the guidance set forth in APB Opinion No. 29 relative to
nonmonetary  exchanges and the gross versus net reporting indicators provided in
EITF 99-19 should be made in the context of the various activities of the entity
rather than based solely on the terms of the individual contracts.  As stated in




                                                                         Page 16


the Form 20-F, the application of EITF 03-11 did not impact  Endesa's  financial
position, cash flows or results of operations.

Endesa considers that the pass-through transactions,  intra-company transactions
and gas exchange  transactions  described in our response to Question 1 that are
analyzed under U.S. GAAP relate to transactions that are not within the scope of
EITF 02-03 or EITF 03-11 since they involve transactions that we have designated
as "normal  purchases and normal sales" pursuant to paragraph 10(b) of Statement
133 and related  Implementation  Issues and did not relate to contracts  entered
into for trading purposes or physically settled  derivative  contracts not "held
for trading purposes".

               We have  applied  EITF 02-03 when  accounting  for all  contracts
entered  into for  trading  purposes  by us,  measuring  them at fair  value and
recording in the  consolidated  balance  sheet the gains and losses  included in
current earnings in a net basis. In addition, we have considered the guidance in
EITF 03-11 for all physically settled derivative contracts not "held for trading
purposes" in the  determination of the income statement  presentation on a gross
or net basis of such  contracts.  Our  application  of both EITF  02-03 and EITF
03-11 for transactions under the scope of each accounting  guidance has remained
the same before and after we filed the Form 20-F/A.

               It is unclear  from the current  disclosure  whether you view the
revision of net sales in  accordance  with U.S.  GAAP as a change in  accounting
principle,  a change in accounting  estimate or the  correction of an error.  In
consideration of APB No. 20, please tell us the nature and justification for the
change in net sales in  accordance  with U.S.  GAAP. If you believe this to be a
change  in  accounting  principle  please  tell us if you  have  disclosed  in a
previous SEC filing,  the  anticipated  accounting  method and adoption  date in
accordance with SAB No. 74 (Topic 11M) or,  alternatively,  tell us why you have
not. If you believe this to be a correction of an error,  please tell us how you
have satisfied the disclosure requirements stated in paragraphs 36 and 37 of APB
No. 20. We may have further comments.

               Endesa  views the prior  period  adjustments  to its net sales in
accordance  with U.S. GAAP  contained in the Form 20-F/A as the correction of an
error, as defined in APB Opinion No. 20. According to such definition,  an error
results from  mathematical  mistakes,  mistakes in the application of accounting
principles,  or  oversight  or  misuse  of facts  that  existed  at the time the
financial statements were prepared. In contrast, a change in accounting estimate
results from new information or subsequent  developments  and  accordingly  from
better  insight  or  improved  judgment,  and a change in  accounting  principle
results from adoption of a generally  accepted  accounting  principle  different
from  the one  used  previously  for  reporting  purposes  (including  not  only
accounting  principles  and  practices  but also the methods of applying  them).
Subsequent to the submission of its Form 20-F to the  Commission,  Endesa became
aware that, in its reconciliation of net sales from Spanish GAAP to U.S. GAAP in
the Form 20-F, Endesa had not eliminated certain transactions that, as described
in our  response to Question 1 above,  should have been  eliminated  pursuant to
U.S. GAAP.  Accordingly,  Endesa  complied with the disclosure  requirements  of




                                                                         Page 17


paragraphs  36 and 37 of APB 20 by  reporting  the  correction  in the period in
which it was  discovered as a prior period  adjustment and disclosing the nature
of the  above-described  error and the  absence  of any effect on  Endesa's  net
income.  In this regard, we draw the Staff's attention to the disclosures in the
third and fourth  paragraphs under  "Explanatory  Note" in the Form 20-F/A,  the
table under "Selected  Financial Data," including footnotes 6 and 7 (pages 1-2),
and the first three  paragraphs of Note 26.27  ("Classification  differences and
other"),  as  restated,  of Endesa's  consolidated  financial  statements  (page
F-119).

               We note  that,  in  accordance  with  paragraph  36 of APB 20 and
paragraph 18 of APB Opinion No. 9, those items that are reported as prior period
adjustments shall, in single period  statements,  be reflected as adjustments of
the opening  balance of  retained  earnings.  When  comparative  statements  are
presented, corresponding adjustments should be made of the amounts of net income
(and the components thereof) and retained earnings balances (as well as of other
affected  balances)  for all of the  periods  reported  therein,  to reflect the
retroactive application of the prior period adjustments.

               Therefore,  since the  correction of this error affected only the
additional disclosures in Note 26. 27. ("Classification  differences and other")
in our consolidated financial statements and since it did not have any effect on
our income  before  extraordinary  items,  net  income,  earnings  per share and
shareholders' equity in accordance with U.S. GAAP, the application of APB 20 and
APB 9 impacted  only certain U.S. GAAP  financial  information  presented  under
"Selected  Financial  Data" in the Form 20-F and the  description of differences
between  Spanish  and U.S.  GAAP which do not affect net income or net equity in
Note 26.27 of our consolidated  financial  statements.  The revised audit report
included in the Form 20-F/A refers to the restatement of Note 26.27.

                                     * * *




                                                                         Page 18


               Endesa  acknowledges  that it is responsible for the adequacy and
accuracy of the disclosure in its Form 20-F/A, that Staff comments or changes to
disclosure in response to Staff  comments do not foreclose the  Commission  from
taking any action with  respect to the filing,  and that it may not assert Staff
comments  as a defense in any  proceeding  initiated  by the  Commission  or any
person under the federal securities laws of the United States.

               Please  feel  free to call me at +34 91 213  1394 if you have any
questions about this response letter.

                                                     Very truly yours,

                                            By:      /s/ Jose Luis Palomo
                                                     --------------------
                                            Name:    Jose Luis Palomo
                                            Title:   CFO


cc:      Brian McAllister
         (Securities and Exchange Commission)

         Joseph B. Frumkin
         Sergio J. Galvis
         Richard A. Pollack
         Angel L. Saad
         (Sullivan & Cromwell LLP)