Exhibit 99.1


                     KEYSPAN ENERGY TO ACQUIRE EASTERN ENTERPRISES IN
                  STRATEGIC COMBINATION FOR APPROXIMATELY $2.5 BILLION

                 __Creates Largest Gas Distribution Company in the Northeast

Brooklyn,  NY and Weston,  MA __November 4, 1999 __ KeySpan  Corporation  [NYSE:
KSE] ("KeySpan Energy") and Eastern Enterprises [NYSE: EFU] today announced that
the  companies  have signed a definitive  merger  agreement  under which KeySpan
Energy will  acquire all of the common stock of Eastern  Enterprises  for $64.00
per share in cash. This represents a premium of 24% over the Eastern Enterprises
closing price of $51.56 on Wednesday,  November 3, 1999,  and a 45% premium over
the average of the last 90_day trading period. The transaction has a total value
of  approximately  $2.5  billion  ($1.7  billion in equity  and $0.8  billion in
assumed debt and preferred  stock).  The transaction  will be accounted for as a
purchase and will be immediately accretive to KeySpan Energy's cash earnings per
share and will turn accretive to the company's  earnings per share in the second
year after closing.

Robert B.  Catell,  chairman  and chief  executive  officer of  KeySpan  Energy,
commented,  "Together KeySpan Energy and Eastern share a common vision as to the
great potential of the markets we serve.  Our combined  companies will serve 2.4
million customers and will be strong competitors in the emerging energy markets.
This merger is consistent  with our vision for growth,  and with the addition of
Eastern's unregulated businesses, accelerates our plans to become a full service
energy  company.  We  look  forward  to  working  with  Eastern's  well_regarded
management  team to continue to provide  safe and  reliable  energy  services to
customers  throughout the Northeast and to build future value for all of KeySpan
Energy's shareholders.

"This  combination  provides an excellent  opportunity to increase  growth while
introducing geographic and regulatory diversity," Mr. Catell continued. "Eastern
Enterprises  is by far the  largest  natural  gas  distribution  utility  in New
England,  however,  there  is  still  significant  upside  potential  due to the
relatively low penetration of customers  using gas for heat in the region.  This
opportunity  is similar to what KeySpan Energy is  experiencing  on Long Island.
The  combined  company  will employ its  considerable  marketing  expertise  and
acclaimed  customer  service to enhance  this  growth.  The  development  of new
pipeline  capacity and new supply options to New England over the past two years
will certainly help us to grow our customer base.

"In addition,  the combined company will have a broad platform for future growth
for the full array of services KeySpan Energy and Eastern  Enterprises have been
developing in their non_regulated subsidiaries," Mr. Catell added.

"We have great respect for the Eastern Enterprises employees and look forward to
having them join the KeySpan Energy family. We each have a proud history of over
100 years of positive community  involvement and look forward to continuing that
tradition," Mr. Catell concluded.

 J. Atwood  Ives,  Eastern  chairman  and chief  executive  officer,  commented,
"Eastern's  Board of Trustees and management have concluded an extensive  twelve
week review and analysis of the company's strategic alternatives.  The choice of
KeySpan Energy as our partner for the future will bring  immediate and long_term
benefits to our customers, shareholders, employees and the communities we serve.
The  increased  size and scope of the  combined  organization  will enable us to
provide  enhanced,  cost_effective  customer  service and to  capitalize  on the
above_average  growth opportunities for natural gas in the Northeast and provide
additional resources to our unregulated businesses."

Mr. Ives  concluded,  "We have known and respected Bob Catell and his management
team for many  years.  We share  their  vision  that  together  we can build the
premier full service energy company in the Northeast." The combined company will
have  assets  of  $8.8  billion,  $4.3  billion  in  revenues,   and  EBITDA  of
approximately $950 million.

KeySpan Energy expects  pre_tax  annual cost savings will be  approximately  $30
million.  These cost savings result  primarily from the elimination of duplicate
corporate and administrative  programs,  greater  efficiencies in operations and
business  processes,  and  increased  purchasing  efficiencies.  KeySpan  Energy
expects to achieve  reductions  due to the merger  through a variety of programs
which would include hiring freezes, attrition and separation programs. All union
contracts will be honored.

KeySpan  Energy  expects to raise $1.7  billion  of  initial  financing  for the
transaction  in short term markets  which will  ultimately be replaced with long
term financing.  Going forward,  KeySpan Energy will actively manage its balance
sheet to maintain strong investment grade ratings at each of its rated entities.

KeySpan Energy  anticipates  continuing  its current  annual  dividend of $1.78.
Eastern  Enterprises  will  continue  to pay its  dividend at the annual rate of
$1.72.

Mr. Catell will remain chairman and CEO of the combined company. Upon completion
of the transaction,  Mr. Ives will retire from active  management at the company
and  will  join  the  KeySpan  Energy  board  of  directors.   KeySpan  Energy's
headquarters will remain in New York.

Boston will serve as the New England headquarters for the combined company.

The merger is  conditioned,  among other  things,  upon the  approval of Eastern
Enterprises  shareholders,  the Securities  and Exchange  Commission and the New
Hampshire  Public  Utility   Commission.   The  company   anticipates  that  the
transaction can be completed in
9 to 12 months.

J.P.  Morgan & Co.  acted as  financial  advisor and Simpson  Thacher & Bartlett
acted  as legal  counsel  to  KeySpan  Energy.  Salomon  Smith  Barney  acted as
financial   advisor  and  Ropes  &  Gray  acted  as  legal  counsel  to  Eastern
Enterprises.

In  connection  with the  merger,  Eastern  Enterprises  has  amended its merger
agreement  with  EnergyNorth,  Inc.  to provide for an all cash  acquisition  of
EnergyNorth shares at a price per share of $61.13. The restructured  EnergyNorth
merger is expected to close  contemporaneously  with the KeySpan  Energy/Eastern
Enterprises transaction.

 Eastern Enterprises owns and operates Boston Gas Company, Colonial Gas Company,
Essex Gas  Company,  Midland  Enterprises  Inc.  Transgas  Inc.  and  ServicEdge
Partners,  Inc. Upon  completion of the pending merger with  EnergyNorth,  Inc.,
Eastern will serve over 800,000 natural gas customers in  Massachusetts  and New
Hampshire. Midland, headquartered in Cincinnati, Ohio, is the leading carrier of
coal and a major  carrier  of other  dry bulk  cargoes  on the  nation's  inland
waterways.  Transgas  is  the  nation's  largest  over_the_road  transporter  of
liquefied  natural  gas.  ServicEdge  is the  largest  unregulated  provider  of
residential   HVAC   equipment   installation   and  service  to   customers  in
Massachusetts.  More  information  can be  found  at  the  company's  Web  site:
www.efu.com.

KeySpan  Energy is a holding  company  operating two utilities  that  distribute
natural gas under the Brooklyn  Union name to 1.6 million  customers in New York
City and on Long Island, making it the fourth largest  gas_distribution  company
in the United  States.  Other  KeySpan  Energy  companies  market a portfolio of
gas_marketing   and   energy_related   services   in  the   Northeast,   operate
electric_generation  plants in New York  City and on Long  Island,  and  provide
operating and customer  services to 1.1 million  electric  customers of the Long
Island Power Authority.  KeySpan Energy's unregulated energy activities focus on
three principal lines of business:  gas exploration and  development,  primarily
through The Houston  Exploration  Company (NYSE:  THX);  domestic  pipelines and
storage; and international  activities,  including gas_processing in Canada, and
gas pipelines and  local_distribution  in Northern Ireland. More information can
be found at the company's Web site:
www.keyspanenergy.com.

Certain  statements  contained  herein  are  forward_looking  statements,  which
reflect  numerous  assumptions and involve a number of risks and  uncertainties.
Actual results may differ  materially from those  discussed in such  statements.
Among the factors  that could cause  actual  results to differ  materially  are:
available  sources and cost of fuel;  State and Federal  regulatory  initiatives
that increase  competition,  threaten cost and investment  recovery,  and impact
rate  structures;  the  ability of the Company to  successfully  reduce its cost
structure;  the  ability  of the  Company  to  successfully  integrate  acquired
operations;  the degree to which the  Company  develops  non_regulated  business
ventures; the effect of inflationary trends and increases in interest rates; the
ability of the  Company and its  significant  vendors to modify  their  computer
software,  hardware  and  databases  to  accommodate  the year  2000;  and risks
detailed from time to time in reports and other  documents  filed by the Company
with the Securities and Exchange Commission.

Contacts for KeySpan Energy:                  Contacts for Eastern Enterprises:
Name: Robert J. Mahony                        Name: Jane W. McCahon
Phone: 718.403.2503                           Phone: (781) 647_2316

Name:   Michael J. Taunton
Phone: 718.403.3265