July 27 (Reuters) - U.S. natural gas futures dropped about 5% to a one-week low on forecasts for less demand and less hot
weather over the next two weeks than previously expected.
        That price drop came despite a slightly smaller-than-expected storage build last week when hotter-than-normal weather boosted
the amount of gas power generators burned to produce power to keep air conditioners humming.
  
        In the spot market, meanwhile, power and gas prices in some markets rose to their highest in months as homes and businesses
continued to crank up their air conditioners to escape a lingering heat wave blanketing much of the country this week. That extreme
heat is boosting power demand to near-record levels and stressing electric grids across the country.
    The U.S. Energy Information Administration (EIA) said utilities added 16 billion cubic feet (bcf) of gas into storage during the
week ended July 21.
    That is a slightly less than the 19-bcf build analysts forecast in a Reuters poll and compares with an increase of 18 bcf in the
same week last year and a five-year (2018-2022) average increase of 31 bcf.
    Last week's increase boosted stockpiles to 2.87 trillion cubic feet (tcf), or 13.1% above the five-year average of 2.642 tcf for
the time of year.
    On its next to last day as the front-month, gas futures for August delivery on the New York Mercantile Exchange fell 12.6
cents, or 4.7%, to $2.539 per million British thermal units (mmBtu) at 10:41 a.m. EDT (1441 GMT), putting the contract on track for
its lowest close since July 17.
    Futures for September, which will soon be the front-month, were down about 10 cents to $2.60 per mmBtu.
    The premium of futures for September over August  were on track to hit a record high for a second day in a row on
Thursday. That is a big change from where the spread usually trades. Over the past four years, September has traded at a premium to
August on just 14 occasions - all of them in June and July of 2023.
    In the spot market, next-day power prices for Thursday soared to their highest since December 2022 at the Palo Verde hub
 in Arizona and their highest since February 2023 at the PJM Western Hub , which covers an area from
northwestern Pennsylvania to Washington, D.C.
    Next-day gas for Thursday at the Southern California Border  nearly doubled to $12.55 per mmBtu, their highest
since March 2023.
    
    SUPPLY AND DEMAND
    Data provider Refinitiv said average gas output in the U.S. Lower 48 states rose to 101.5 billion cubic feet per day (bcfd) so far
in July, up from 101.0 bcfd in June. That compares with a monthly record of 101.8 bcfd in May.
    Even though the weather will be less hot over the next two weeks than previously expected, meteorologists forecast the weather in
the Lower 48 states will remain hotter than normal through at least Aug. 11.
    Refinitiv forecast U.S. gas demand, including exports, would rise from 104.7 bcfd this week to 105.7 bcfd next week. Those
forecasts were lower than Refinitiv's outlook on Wednesday.
    Gas flows to the seven big U.S. LNG export plants rose to an average of 12.7 bcfd so far in July from 11.6 bcfd in June. That is
still well below the monthly record of 14.0 bcfd in April due to ongoing maintenance at several facilities.
    On a daily basis, however, LNG feedgas fell to a preliminary two-week low of 12.2 bcfd due to recent reductions at Cheniere
Energy's Sabine Pass in Louisiana and the shutdown of the Columbia pipeline to Berkshire Hathaway Energy's Cove Point in
Maryland.
    The amount of gas flowing to Cove Point was on track to reach 0.6 bcfd on Thursday, the same as Wednesday, after dropping to 0.5
bcfd on Tuesday due to the Columbia pipe fire. That compares with feedgas of around 0.8 bcfd since November.
    
                                                                      Week ended    Week ended    Year ago     Five-year         
                                                                        Jul 21       Jul 14        Jul 21       average    
                                                                       Forecast       Actual                    Jul 21     
 U.S. weekly natgas storage change (bcf):                                 16            41           18           31             
 U.S. total natgas in storage (bcf):                                     2,987        2,971         2,414        2,642           
 U.S. total storage versus 5-year average                                13.1%        13.8%                                      
                                                                                                                                 
                                                                                                                                 
 Global Gas Benchmark Futures ($ per mmBtu)                           Current Day   Prior Day    This Month   Prior Year    Five Year
                                                                                                  Last Year     Average      Average
                                                                                                                 2022      (2017-2021)
 Henry Hub                                                               2.63          2.67         7.19         6.54         2.89
 Title Transfer Facility (TTF)                                           9.39          9.58         51.76        40.50        7.49
 Japan Korea Marker (JKM)                                                11.10        11.46         39.36        34.11        8.95
                                                                                                                                 
                                                                                                                                 
 Refinitiv Heating (HDD), Cooling (CDD) and Total (TDD) Degree Days                                                              
 Two-Week Total Forecast                                              Current Day   Prior Day    Prior Year     10-Year      30-Year
                                                                                                                 Norm         Norm
 U.S. GFS HDDs                                                             3            3             1            2            3
 U.S. GFS CDDs                                                            239          243           245          211          201
 U.S. GFS TDDs                                                            242          246           246          213          204
                                                                                                                                 
 Refinitiv U.S. Weekly GFS Supply and Demand Forecasts                                                                           
                                                                      Prior Week   Current Week   Next Week    This Week    Five-Year
                                                                                                               Last Year   Average For
                                                                                                                              Month
 U.S. Supply (bcfd)                                                                                                                   
 U.S. Lower 48 Dry Production                                               101.2         101.2        101.2         98.0         90.5
 U.S. Imports from Canada                                                     7.4           7.6          7.6          9.1          8.2
 U.S. LNG Imports                                                             0.0           0.0          0.0          0.0          0.1
 Total U.S. Supply                                                          108.6         108.8        108.8        107.1         98.8
                                                                                                                                      
 U.S. Demand (bcfd)                                                                                                                   
 U.S. Exports to Canada                                                       1.7           1.6          1.6          2.5          2.4
 U.S. Exports to Mexico                                                       6.6           6.1          6.7          5.7          5.5
 U.S. LNG Exports                                                            12.7          12.7         12.7         10.6          6.1
 U.S. Commercial                                                              4.3           4.4          4.4          4.4          4.5
 U.S. Residential                                                             3.5           3.5          3.6          3.5          3.6
 U.S. Power Plant                                                            48.0          47.7         48.0         43.7         41.7
 U.S. Industrial                                                             21.3          21.4         21.4         21.3         21.1
 U.S. Plant Fuel                                                              5.0           5.0          5.0          5.0          5.0
 U.S. Pipe Distribution                                                       2.2           2.2          2.3          2.3          2.2
 U.S. Vehicle Fuel                                                            0.1           0.1          0.1          0.1          0.1
 Total U.S. Consumption                                                      84.6          84.3         84.7         80.3         78.2
 Total U.S. Demand                                                          105.6         104.7        105.7         99.1         92.2
                                                                                                                                      
                                                                                                                           
 U.S. Northwest River Forecast Center (NWRFC) at The Dalles Dam       Current Day  Prior Day        2022      2021         2020       
                                                                      % of Normal  % of Normal   % of Normal  % of Normal  % of Normal
                                                                       Forecast      Forecast      Actual       Actual       Actual
 Apr-Sep                                                                  83            83           107          81           103
 Jan-Jul                                                                  77            77           102          79           98
 Oct-Sep                                                                  75            75           103          81           95
                                                                                                                           
                                                                                                                           
 U.S. weekly power generation percent by fuel - EIA                                                                                   
                                                                      Week ended    Week ended   Week ended   Week ended   Week ended
                                                                        Jul 28        Jul 21       Jul 14        Jul 7       Jun 30
 Wind                                                                      6            7             7            6           10
 Solar                                                                     4            4             4            4            4
 Hydro                                                                     6            6             6            6            6
 Other                                                                     2            2             2            2            2
 Petroleum                                                                 0            0             0            0            0
 Natural Gas                                                              45            46           45           45           43
 Coal                                                                     20            19           19           19           18
 Nuclear                                                                  17            17           17           18           17
                                                                                                                                 
 SNL U.S. Natural Gas Next-Day Prices ($ per mmBtu)                                                                              
 Hub                                                                  Current Day   Prior Day                                    
 Henry Hub                                                      2.60          2.66                                       
 Transco Z6 New York                                           2.09          1.99                                       
 PG&E Citygate                                                5.32          5.43                                       
 Eastern Gas (old Dominion South)                            1.47          1.65                                       
 Chicago Citygate                                              2.46          2.39                                       
 Algonquin Citygate                                            6.30          4.60                                       
 SoCal Citygate                                             12.55          6.65                                       
 Waha Hub                                                    2.32          2.30                                       
 AECO                                                        1.75          1.73                                       
                                                                                                                                      
 SNL U.S. Power Next-Day Prices ($ per megawatt-hour)                                                                                 
 Hub                                                                  Current Day   Prior Day                                         
 New England                                                98.75         58.00                                       
 PJM West                                                  142.75         51.50                                       
 Ercot North                                                56.00         40.75                                       
 Mid C                                                      89.00        104.20                                       
 Palo Verde                                                231.00        126.00                                       
 SP-15                                                      76.00         76.75                                       
 
 (Reporting by Scott DiSavino; editing by Jonathan Oatis)