Sunday, April 13, 2014

Pipeline* - Local Natural Gas Distribution Companies - Natural Gas in New Hampshire Part 3

In my last post, I finished off by introducing the two local natural gas distribution companies (LDCs) here in New Hampshire that deliver natural gas to residential, commercial, and industrial customers through their distribution networks. As a reminder, I again present the map below  which shows the service areas of these two LDCs.


Source: NHPUC
The first and largest of the NH LDCs, with about 89,000 residential, commercial, and industrial customers as of 2012, is EnergyNorth which does business under the Liberty Utilities umbrella. Liberty Utilities has the franchise for the distribution of natural gas up the Merrimack corridor to the Lakes region—where they tap into a branch of the Tennessee Gas pipeline—and the tiny Berlin “island”, where they draw off the Portland Natural Gas Transmission System Pipeline that crosses the northern part of the state. EnergyNorth was, for many years, a standalone natural gas distribution company, but has recently been through several ownership changes. In 2000, it was acquired by Keyspan. In 2006, National Grid, a UK utility company, acquired Keyspan. National Grid then sold EnergyNorth to Liberty Utilities in 2012. Liberty Utilities is itself part of a much larger, multifaceted energy company, Alqonquin Power and Utilities Corporation. Alqonquin owns hydroelectric, wind, and solar generating facilities, and well as water, natural gas, and electricity distribution businesses in the US and Canada. Alqonquin Power and Utilities is headquartered in Oakville, Ontario, and is listed on the Toronto Stock Exchange. Liberty Utilities also has a smaller business distributing electricity to about 43,000 customers in the west and south regions of NH.

The other natural gas LDC is Northern Utilities, which operates under the Unitil name. This is a smaller natural gas and electricity distribution company with operations in Maine, NH, and Massachusetts. In NH, their gas distribution business is limited to the sea-coast area where they draw of the Granite State Gas Transmission pipeline which runs up the coast to Portland, Maine.   In 2012, they had about 30,000 natural gas customers. Northern Utilities Company has also been through many ownership changes. It was purchased by Bay State Gas in 1979, which  merged with NiSource in 1999. NiSource then merged with the Columbia Energy Group in 2000 and, in 2008, Northern Utilities was purchased by Unitil. Like Liberty Utilities, Unitil is also in the electricity distribution business in NH. Unitil is a publically traded corporation listed on the NYSE and is headquartered in Hampton, NH.

There are two aspects to the business of the LDCs. The first is creating and operating the natural gas distribution pipeline and the other is providing the gas that the customer uses. This is the reason that NH natural gas users are charged separately for natural gas distribution services and for the natural gas commodity itself (see Jumping Jack Gas for a typical breakout of a NH natural gas bill).  Establishing and operating a gas distribution network is a complicated, expensive,  and highly specialized business so these utilities have the sole right to distribute natural gas in a specified area - a monopoly - on condition that it is done cost-effectively, safely, and that the service is reliable. As a consequence of the monopoly awarded to these companies, they are tightly regulated by the New Hampshire Public Utilities Commission. (For a primer on public utilities, see What’s It All About, Alfie?)

In NH, the natural gas business is partially deregulated. Only the large industrial and commercial customers can choose their natural gas supplier from competitive suppliers. Residential users have no choice and are obligated to purchase their natural gas from their local distribution company. The LDCs therefore distribute natural gas supplied by others in the case of commercial industrial customers or supplied directly by themselves directly for residential customers.

Operating a natural gas distribution company is a challenging business. As we were reminded again by the gas explosion in New York last month that killed eight people and leveled two buildings, handling, transporting, and safely delivering a combustible fuel takes special technology and unique precautions. When the pipelines leak and the leaks go undetected or unreported, the consequences can be disastrous. The LDCs have a safety-first approach and are very concerned about running a safe distribution system. They react rapidly to reports of natural gas leaks. We, as citizens, also bear some responsibility for natural gas safety and we should promptly report leaks when we smell that distinctive natural gas smell. All excavation projects, including simple home projects like planting trees and shrubs, should be first cleared by a call to the Dig Safe hotline at 811 so that they can come out and mark where your utility lines run. Nothing quite spoils a gardening or home construction project like puncturing a natural gas line: you really don’t want to be that guy who caused the whole neighborhood to evacuate on a Sunday morning! 


Source: Flickr - Eugene Peretz

One of the prevailing safety issues is that the original gas distribution piping was made of unprotected cast iron or bare steel buried underground. After years of underground exposure, these pipelines slowly corrode and, in areas where soil moisture is high or the conditions are highly corrosive, corrosion can be severe and leaks can occur. The picture below shows a piece of highly corroded pipe removed from a natural gas distribution network in NH. The LDCs have active programs in place to replace steel pipe with newer and safer high tech plastic piping, but this is an expensive endeavor with costs of the order of $1.5 million per mile. Over the years, the utilities have replaced a great deal of their networks with plastic distribution pipelines. The latest pipeline report indicates that only 155 miles (8.2%) of the 1875 miles of piping in NH is still made of iron. Compare this to NYC, where 60% of distribution mains are still made of cast iron or bare steel and where some of the lines are over 100 years old.


Source: NHPUC Filing

These LDCs are an important component of the business infrastructure for NH and, like all other businesses, they are looking to grow and to earn a return on their investment. However, they face some unique challenges. From my research and discussions with some of the LDCs and other folks who have been in the natural gas business for a long time, I got an improved understanding and appreciation for their business and challenges. Here are some of the interesting things I have learned:

  • LDCs make their money from the distribution of natural gas and not from the sale of gas. The natural gas is passed through to their customers on a dollar-for-dollar basis. They are not allowed to mark up the price of natural gas that they purchase and resell. In the case of commercial and industrial customers, they simply transport gas provided by a competitive supplier.
  • Because the LDCs are regulated utilities with a monopoly in their service area, any rate changes to their services need to be approved by the regulators at the NH Public Utilities Commission. 
  • In the rate-setting process, several factors are taken into account, the key one being the investment the LDCs have made in distribution equipment and facilities (pipelines, compressor stations, trucks, etc.) as well as the working capital used to operate their business. These investments are collectively known as the rate base. Expenses such as payroll, administration, and taxes are also taken into account. Because LDCs are for-profit business, they are allowed to earn a return on their distribution services, however, the rate of return is capped by the regulators, and is typically in the range of 9 to 10% on the equity invested.
  • Rate-setting is a complicated business and rate cases presented by utilities are expensive and lengthy endeavors requiring a great deal of review and analysis by both the LDC and the regulators.
  • Growing the natural gas distribution business is expensive and challenging. The reasons are complex, but an important aspect is that within the networks, the LDCs have already been very successful in signing up natural gas customers. In their service areas, which is considered to be within 100 ft of natural gas main, the LDCs have already signed up about 80% of potential customers. This significantly limits potential growth in their customer base from within their existing distribution network. Growth needs to come from expanding the network.
  • At the same time as the natural gas utilities are trying to grow their businesses, there is a negative impact on natural gas usage due to energy-efficiency measures  in homes and the “natural” turnover and replacement of aging heating units, such as dryers and stoves, to more efficient units.

As public utilities, the LDCs are required to submit annual reports to the NH Public Utilities Commission. These reports make for compelling reading. Here are some interesting details that I gleaned from an examination of the 2012 annual reports (2013 reports are not yet available):

  • These are capital-intensive business with profitabilities of the order of 5%.
  • Revenues per customer are ~$900 per year and net income per customer is only about $50/year, which is not a great deal.
  • The bulk of their costs are associated with the purchase of natural gas (about 60% of their overall expenses).
  • Other costs include typical operations and maintenance costs, depreciation, administration and debt service expenses.
  • The LDCs keep a small supply of liquefied natural gas at storage facilities on hand to assist with supply shortages. Some will even use propane when natural gas is in short supply and some LDCs have even purchased storage capacity at underground storage locations located in other parts of the US to ensure gas supply during periods of high demand.  

A question often asked is why the natural gas utility cannot provide natural gas to your home. The main reason is that there may not be a natural gas main pipeline nearby. The service area for a natural gas company typically lies within 100 ft of a mainline: anything further becomes too expensive. Expansion of service area by the laying down of new distribution piping is expensive and consideration must be given to the costs of pipeline extensions, housing density, and the probability of signing up new customers. Moreover, regulators are very sensitive to the “socialization” of expansion plans so they do not want network expansion plans funded by rate increases for existing customers. New pipelines, which cost about $1 million per mile, have to be paid by new customers. As noted earlier, the income per natural gas customer per year is low so capital recovery and return on investment requires a very long period. It is for this reason that expansion in natural gas service areas is a slow, measured, and carefully evaluated process.


In my next post, I will take a closer look at retail natural gas pricing in New Hampshire, which turns out to be a fairly complicated matter.

In the meantime, remember to turn off the lights before you leave the room and call Dig Safe at 811 before starting to dig.

Mike Mooiman
Franklin Pierce University
mooimanm@franklinpierce.edu





[*Pipeline – A great 1960’s surf music instrumental by the Chantays. I have always have loved the way this tune kicks off with that distinctive riff. You just know there are good things to come. Here is Pipeline, covered by Stevie Ray Vaughn and surf guitar god, Dick Dale.] 

Friday, March 28, 2014

End of the Line* - Natural Gas Transmission Pipelines in New Hampshire - Natural Gas in New Hampshire Part 2

One of the major sources of energy in New Hampshire is natural gas. Natural gas has also been a major disruptive force in the energy markets throughout the US. Just five years ago, we were importing significant quantities of natural gas into the US and foreign deliveries of liquefied natural gas, such as that shown below, to storage depots located in Boston harbor were the order of the day.

Liquefied Natural Gas Tanker Making Its Way Through Boston Harbor Near Charlestown

In 2008 fracking technology kicked into high gear and we were able to release the vast resources of previously inaccessible natural gas and oil located in shale deposits in Texas, Pennsylvania, North Dakota, and other places.

Natural gas is typically transported by major interstate pipelines that run across the US. As I noted in my previous post, these steel gas pipelines are 20 to 42 inches in diameter and are buried underground along 100 ft rights of way. Compressor stations along the pipelines maintain the gas pressures, which can range from 200 to 1500 pounds per square inch. The natural gas is then directed to distribution points where it passes through a gate station. Here it becomes the responsibility of the local distribution company which then drops the pressure, adds the odorant that gives natural gas its distinct smell, and directs the gas through lower pressure and smaller 2 to 8 inch mainlines to homes and business. Service lines branching off the distribution mainline bring the gas directly into homes or businesses.

Natural gas can also be compressed and transported as compressed natural gas,  CNG,  or even liquefied at very high pressures to form liquefied natural gas, LNG, which can be transported by rail, truck, or ship (as shown in the picture above). In fact, CNG and LNG are interesting and growing options to get natural gas to areas where there are no natural gas pipelines (but that will be a topic for a future blog). In this post, we focus on natural gas transported in pipelines.

As shown in the figure below, the US has an impressive network of natural gas pipelines snaking their way across the country, especially across the central corridor from the Great Lakes down through Texas and the Gulf Coast region. The gas pipeline network is particularly dense in the areas where the natural gas is found, such as Texas, Oklahoma, Louisiana, and Pennsylvania.


 Source: EIA

The figure above and the accompanying figure  below, which shows more detail for New England, indicate that the natural gas network is rather more spread out in the Northeast. Massachusetts and Connecticut are reasonably well serviced but this pipeline network somewhat peters out for the northern New England states. When it comes to natural gas pipelines, New Hampshire and Vermont are literally at “the end of the line”.*

Source: ICF/ISO NE 

In NH there are only four natural gas pipelines. The most important for NH residents is the Tennessee Gas Pipeline (TGP) which is owned by Kinder Morgan and which brings gas from Texas, Louisiana, and the Gulf of Mexico into New England. This pipeline crosses New York state and the length of Massachusetts and distributes gas across a large part of MA. This pipeline has several tributaries, one of which branches off near Lowell in Massachusetts and heads north into NH along the communities near the Merrimack River and reaching as far as the Lakes region.

In the northern part of the state,  the Portland Natural Gas Transmission System (PNGTS) pipeline (shown in light blue in the map above) brings in gas from Canada from the Trans-Quebec and Maritimes pipeline systems. This pipeline drops down from Canada along the VT/NH border and then crosses the northern part of the state into Maine where it heads for the seacoast to join up with the Maritimes and Northeast (M&N) pipeline. The PNGTS pipeline, owned by two Canadian gas companies, TransCanada and Gaz Metro, is not a distribution pipeline to deliver gas to NH. Instead it is a transmission pipeline focused on bringing Canadian natural gas to some major paper mill operations in Maine and natural gas-fired generation operations in New England. After this connects with the M&N pipeline in Westbrook, ME, it drops down through the Maine and NH seacoast area, dropping off natural gas in the Portsmouth area on its way to Dracut and Haverhill, MA, to bring Canadian natural gas to the area north of Boston. The section of the pipeline from Westbrook, ME, to Dracut, MA, is a joint venture between PNGTS and M&N.

Source: PNGTS

In NH, the PNGTS pipeline has three metering stations, one in Pittsburg, another in Groveton (the now defunct site of the Groveton and Washau Paper Mills), and an important one in Berlin. At this station, natural gas is tapped off the PNHTS pipeline and distributed in the local Berlin area by Liberty Utilities, which accounts for a lone island of natural gas supply in the northern part of the state. The Gorham paper mill also accesses natural gas from this pipeline and it is the cheap fuel from this pipeline that is large part of why this paper mill is still a viable operation. However, increases in natural gas prices this past winter caused the paper mill to curtail operations and lay off workers. The metering stations represent potential distribution points for natural gas and plans are afoot to use the Groveton and Gorham sites as a distribution point for LNG.

The third pipeline that impacts New Hampshire is the 730-mile long M&N pipeline that brings in natural gas from New Brunswick, the Sable, and Deep Panuke natural gas deposits offshore of Nova Scotia as well as from the LNG storage and re-gasification facility in St. John, New Brunswick. This pipeline is jointly owned by Spectra Energy, Emera, and Exxon Mobil. It connects with the PNGTS in Westford, Maine and, as mentioned above, it then shares the pipeline with PNGTS to head south along the Maine and New Hampshire seacoast on its journey to Dracut. It also branches off and delivers gas to Methuen and Beverley, MA. Its original function was to bring Canadian natural gas from the Maritimes to Atlantic Canada and New England, however, with gas production from Maritimes offshore deposits declining and increased natural gas consumption in the Maritimes states, there could in the future be a shortage of natural gas in the Canadian Atlantic states. In a remarkable reversal, consideration is now been given to reversing the flow of natural gas along parts of this pipeline to bring gas from the Pennsylvanian natural gas deposits up through New England and then sending it north to Maine and perhaps even into Atlantic Canada.

The fourth pipeline is the Granite State Gas Transmission (GSGT) pipeline that runs from Haverhill, MA, up to Portland, ME. This pipeline is owned by Unitil and, for most of its journey, runs in parallel with the PNGTS and M&N shared pipeline, as can be seen from the map below. This pipeline picks up gas from the hubs in the Haverhill area (from either the PNGTS,  M&N, or the TGP pipelines) and then sends it north up the seacoast to Portland, Maine, where it supplies the Unitil distribution network along this area.
Source: GSTS

With knowledge of these four pipelines, it is now straightforward to understand which communities in NH have natural gas, as shown on the map below. As noted, we have the lone northern island of natural gas supply in Berlin where the gas is delivered by PNGTS pipeline. We also have the seacoast communities in dark blue, where the gas is supplied by the GSGT pipeline, and then we have the communities along the Merrimack corridor that tap into the tributary of the TGP pipeline. [There is a single small propane distribution network in Keene which is shown in grey.]
Source: NHPUC

The seacoast area is the service area of Unitil and the Merrimack corridor, and the lone dropoff point in Berlin is serviced by Liberty Utilities. These are the only two local distribution companies  in New Hampshire that deliver natural gas to residential, commercial, and industrial customers through their distribution network.

My next post will take a closer look at these local natural gas distribution companies, but, in the meantime, it is important to be aware that, even though I am looking at natural gas from a NH perspective, we need to appreciate that natural gas consumption and supply is very much a regional matter. All natural gas is imported into New England. It comes in from Texas, Pennsylvania, Canada, and the Maritimes and its supply is very limited by the size and number of pipelines. Natural gas is very much like electricity—difficult to store and much of its use is on demand. When there is insufficient natural gas, electricity production is compromised and the lights could go out.

So until my next post, do your part to keep the lights on by remembering to turn off the lights when you leave the room.

Mike Mooiman
Franklin Pierce University

(End of the Line* - A great tune from the band The Travelling Wilburys that really lived up to its “supergroup”  labeling. Featuring George Harrison, Tom Petty, Jeff Lynne, Roy Orbison, and Bob Dylan, the group’s two albums remind us of what happens when a lot of musical talent and a great deal of superb songwriting come together.)


Wednesday, March 12, 2014

Jumping Jack Gas* – Natural Gas in NH – Part 1

In this post I start a series which looks at natural gas from a New Hampshire perspective, but, as we will learn, we do not stand alone in NH as a natural gas consumer. Natural gas is very much a regional issue, and natural gas supply and consumption can, like electricity, only really be understood from a regional perspective.

Let’s start right away by looking at the history of natural gas consumption in New Hampshire, shown in the chart below. The first thing we note is that that natural gas consumption was relatively low and growing only slowly until 2003 when there was an enormous leap in consumption.

This big increase in NH natural gas consumption was created by the commissioning, at the end of 2002, of the two combined-cycle natural gas combustion turbines at the then new Newington Power Facility. These turbines have a combined capacity of 525 MW and run exclusively on natural gas. This generation operation is owned by Essential Power (formerly known as North American Energy Alliance) which owns a number of other natural gas burning plants. Essential Power itself is owned by Industry Funds Management (IFM) which is a global investment fund held by 30 pension funds. [The Newington Power Facility should not be confused with the similarly named and nearby Newington Station owned by Public Service of New Hampshire, PSNH. The PSNH plant is a much older plant, put into service in 1976, and is a flexible operation that can burn oil or natural gas. This operation is rated at 406 MW capacity, its equipment is old and inefficient by modern standards, and it is used for peaking needs, i.e., it is only fired up when demand for electricity is high and prices are high.] 

As can be noted from chart, other uses of natural gas, such as industrial applications or home and commercial heating, rose slightly from 1980 but have fallen off since the early 2000s. The decline in residential natural gas consumption since 2005, shown below, took me by surprise. I had assumed that with the decrease in natural gas prices, especially when compared to that of home heating oil over the same period, droves of people would have signed up for natural gas and that residential consumption would have increased. In fact, it turns out that the number of natural gas customers did increase from 2005 to 2012 but the increase was small. The number of customers rose by 5.8% from 94,466 to 99,940.  The fall-off in residential natural gas consumption during this period is more likely a reflection of the decade-long warming trend that I highlighted in Crude Oil Blues. I anticipate that the cold winter we are presently enduring here in New England will boost the residential natural gas consumption numbers.




Natural gas is important to us here in New Hampshire for industrial usage and residential and commercial heating but the tail that is wagging the NH natural gas dog is electricity generation. When we talk about electricity generation and natural gas consumption, we really need to think regionally: in truth, this is what we need to do with all energy matters. New Hampshire (as much as the independent Yankee folks up here might like it to be so) is not an energy island. It has few natural energy resources, except for a little hydro, some wind and wood, as well as a slowly growing amount of solar, so we need to think regionally in terms of energy imports and exports as well as our own consumption.

Before we jump into the complexities of regional natural issues, which I will tackle in future posts, let’s take some time to better acquaint ourselves with natural gas.

Natural gas consists largely of methane which is the simplest of the hydrocarbon fuel molecules. Methane is built from one carbon and four hydrogen atoms. Natural gas also contains varying amounts of other hydrocarbons, such as those in the figure below.



Natural gas is produced by the biological decay of vegetation and waste under anaerobic conditions (i.e., in the absence of oxygen or air). It is recovered from natural gas wells, it is often associated with crude oil, and it is found in coal seams. In the US, we have, in the past decade, been able to release vast quantities from shale gas deposits by horizontal drilling and fracturing shale deposits deep underground.

When natural gas is pumped up from underground deposits it is pretty dirty and a good amount of cleanup is required before it can be transported in a pipeline. When natural gas is recovered from conventional or shale gas deposits, it is often accompanied by other hydrocarbon gases, such as ethane, propane, propylene and butanes. Natural gas which contains a lot of these other hydrocarbons is referred to as "wet" gas. These other gases are removed during processing, which also removes water, sulfur, mercury, and other byproducts from the natural gas. The hydrocarbon gases are also separated into natural gas liquid (NGL) fractions, such as ethane, propane, butane, etc., each of which has its own specific use. As noted in Under Pressure, this is the source of much of the propane we use.

The composition of natural gas delivered to consumers therefore varies, depending on its source and the processing it has been through. Typical compositions are shown below.


Source: Union Gas

The most attractive feature of natural gas is that it is clean burning with fewer harmful combustion products than oil or coal. The main emissions are carbon dioxide and water. Of all the carbon-based fuels, methane has the lowest amount of carbon released, per unit of energy released. This is the reason that carbon emissions in the US have dropped as we have shifted from coal-fired to natural gas-fired electricity generation. The table below shows the carbon dioxide emissions per million BTUs produced by the combustion of different fossil fuels. The emissions of natural gas are almost half of those of coal.


Natural gas is odorless and colorless. Its distinctive smell is due to the odorant that distributors are required to add to the gas for safety reasons. The odorant is normally a smelly sulfide compound, a mercaptan, that smells like rotten eggs: if you smell it, it means that you have a gas leak—you should leave the area and call the gas utility right away. Natural gas explosions, although rare, can have devastating consequences, causing loss of life and enormous property damage.

Natural gas is normally transported across the country by pipeline. These steel pipelines are 20 to 42 inches in diameter and buried underground along 100 ft rights of way. The gas flows at a rate of about 30 mph. The pressures range from 200 to 1500 psi and regular compressor stations maintain the pressure along the pipeline routes The natural gas is directed to distribution points where it passes through a gate station. Here it becomes the responsibility of the local distribution company that then drops the pressure, adds the odorant, and directs the gas to homes and business through a smaller diameter and lower pressure natural gas grid. Service lines bringing the gas directly into homes or businesses, through a gas meter, tap into this distribution grid. These service lines can be smaller diameter plastic pipes in which the gas pressure can range from 0.25 to 200 psi, depending on the amount of gas needed by the customer.  

Similar to electricity, there are three main components to the natural gas business. The generation/production side is carried out by natural gas companies who explore for, drill, pump, and treat the gas before it is fed into a pipeline. The transmission part of the business is the large network of natural gas transmission pipes and underground storage caverns across the country. The distribution network is the responsibility of the local distribution company (LDC).


The LDCs have a franchise for a specific area and, because they are monopolies, are regulated by the Public Utilities Commissions. Like electricity in deregulated markets, supply of natural gas is separate from distribution, so if you are able to buy your gas from a competitive supplier, it will have to be transported through the distribution pipeline of the LDC. In New Hampshire, we only have partial natural gas deregulation. Large industrial and commercial customers can purchase natural gas from competitive suppliers but residential natural gas users don’t have a choice and have to purchase their gas from the LDC.

Natural gas has different units to those of the other energy industries, such as electricity or oil. The basic unit of natural gas is a cubic foot of gas which has an energy content of 1027 BTU. This is not a great deal of energy. By comparison, a cubic foot of home heating oil (~7.5 gallons) would have about 1 million BTU. Because the energy content of a cubic foot of gas is so low, we normally talk in terms of hundreds of cubic feet or millions of cubic feet. Also, because a cubic foot of gas has an energy content of approximately 1000 BTU, we often talk about millions of BTU (MMBTU) when discussing natural gas and assume that 1 million BTU (1 MMBTU) of energy  is approximately equal to 1000 cubic feet of natural gas. Returning to the first chart in the post, we note that NH natural gas consumption in 2012 was just over 70,000 MMBTU or approx. 70 million cubic feet.

 A useful set of conversions is provided by the American Gas Association (AGA).



Most home owners pay for natural gas in terms of the heat content measured as therms. One therm is equivalent to 100,000 BTU or approximately 100 cubic feet. The AGA also notes that  193 cubic feet or ~2 therms is enough to meet the daily heating, hot water, and cooking needs for an average US home using natural gas. A few points are noteworthy on the natural gas bill for a NH resident, shown below.



There are three main components to the bill: 1) A minimum service charge; 2) a distribution charge; and 3) a fuel charge. Natural gas is metered into a home in hundreds of cubic feet but is charged in therms. . The conversion from cubic feet to therms involves multiplying by a therm factor (Note 4 in the figure above), in this case 1.035. I noted previously that a cubic foot of natural gas contains 1027 BTU, but this is an average which leads to 1.027 therms per 100 cubic foot. However, the actual BTU content of natural gas is very dependent on the amounts of the other hydrocarbon gases in the natural gas. The higher hydrocarbon gases have a higher heat values, so if the natural gas contains higher amounts of these, the therm factor will be higher than 1.027.

The chart below shows the 13-year fluctuation of retail natural gas prices, courtesy of the NH Office of Energy and Planning. Over this period, there has been considerable price fluctuation, ranging from a low of $0.71 in Oct 2002 to a high of $1.75 per therm in Oct 2008. In fact, as I have highlighted on the chart, at the start of 2013 natural gas prices were relatively low at $0.82 but there has since been a substantial increase, with recent prices getting close to $1.45 per therm. Prices in March are even higher at $1.60 per therm. These Jumping Jack Gas* price increases have been driven by increases in commodity gas prices, which, in turn, have been driven by the increased demand we have experienced due to this very cold winter. We will look more closely at natural gas prices in future blogs.




In my next post, I will take a look at regional natural gas issues and particularly at how it makes its way into New England through the natural gas pipeline network.

Until next time, remember to turn off the lights when you leave the room.


Mike Mooiman
Franklin Pierce University

(*Jumping Jack Gas - A play on the famous Rolling Stones’ tune, Jumping Jack Flash, with the classic line that most of us have lip synced to at one time or another, “Jumping Jack Flash, it’s a gas, gas, gas.” I am a cover tune fan, so enjoy a great but short version of the tune by the frenetic Tina Turner, rocking it out as only she can)

Tuesday, February 18, 2014

Kerosene Hat* - Home Heating Oil in New Hampshire – Part 3

I have recently become intrigued with kerosene and its use in home heating. Part of this interest stems from the fact that one of my nephews dabbled for a while in the art of fire breathing which uses kerosene as well as my interest in the history of the oil industry which I share with students in the Energy and Sustainability  MBA program at Franklin Pierce University via Daniel Yergin’s book, “The Prize,” which is a well-written account of the oil industry.

Jeddon Mooiman showing off his fire breathing skills.

Kerosene (known in the UK and many of the old British colonies as “paraffin”) was the first crude oil distillate that made its way into common use. It came into commercial production in the 1850s and quickly displaced the whale oil that was used for lighting at that time. Kerosene has a long history of cooking and heating applications and is still extensively used in Africa and Asia as a cooking and lighting fuel. Today, the largest use of kerosene is as aviation fuel.

When I was growing up in Africa, a lot of cooking in rural areas was done on kerosene-fired Primus stoves, such as the one shown in the figure below. The basic design for this kerosene stove comes from 1892 and the and has not changed much since then. Many of these units, or similar ones, are still in service in Africa and Asia. In fact, these were the stoves of choice for many of the polar expeditions and when Hillary and Tenzing ascended Everest for the first time in 1953.


When crude oil is distilled, the kerosene fraction boils off before the diesel/ home heating oil (HHO) fraction. As a result, kerosene is a little less viscous and slightly more volatile than diesel and the hydrocarbons in kerosene typically contain 9 to 16 carbons, whereas diesel contains hydrocarbons with 10 to 20 carbon atoms. (The exact blend of hydrocarbons depends on the source of the crude oil used in the refining process as well as the type of refining process used.) One of the best features of kerosene is that it stands up to colder temperatures much better than diesel. At very low winter temperatures diesel and HHO fuels can start to become slushy as the longer chain hydrocarbons begin to gel, forming waxes, which can plug up fuel lines and filters, causing heating furnaces to shut down. These waxes start to appear at temperatures known as the cloud point of the fuel. As temperatures continue to drop below the cloud point, more wax is formed and the fuel can become so slushy that it will not even flow. This is known as its gel point. Home heating oil has a cloud point of 9 to 10oF but kerosene will only begin to cloud at -40oF. With its lower cloud and gel point, kerosene is often blended into  transportation diesel in the winter months to ensure that the diesel does not gel in the  tanks of trucks and other heavy equipment. Aircraft flying at high elevations are subject to very low temperatures and the aviation fuel variant of kerosene, jet fuel, is therefore ideally suited to this low temperature environment and application.

It is the cold temperature stability of kerosene that accounts for its frequent use as a home heating fuel for mobile or manufactured homes. In mobile homes using oil heat, the fuel storage tanks have to be located outside of the residence where the fuel is subjected to the cold winter temperatures. Here in, New England, where temperatures regularly reach single digit temperatures, having typical #2 HHO in an outside storage tank could be problematic for heating units.


Many of us with typical stand-alone homes give little thought to mobile homes and their particular heating challenges.  It turns out that mobile housing units are a large part of the NH housing stock and it is estimated that there are ~30,000 units in NH (5.7% of the 519,000 residences). This means that there are many NH residents who are obliged to use kerosene due to the need to locate the storage tank outside of the home. The problem is that kerosene is the most expensive of the commonly used home heating fuels. As shown by the NH data in the figure below, kerosene is consistently more expensive than regular #2 HHO - typically costing about $0.50/gallon more. (As an aside, on an energy content basis, the most expensive way to heat is with electricity, then propane, and then kerosene, followed by regular HHO. See my Under Pressure and Closer to Home posts.) 



These higher fuel prices clearly impact those least able to afford it. Moreover, it has been reported that mobile homes built before 1980, which comprise a large part of NH mobile home stock, have, due to poor insulation, an energy consumption per square foot that is 53% higher than other types of homes. With the combination of higher energy consumption and higher fuel prices, it is clear that folks living in mobile homes are deeply impacted by cold weather and home heating expenses: lower income families who live in mobile homes therefore spend a larger portion of their income on heating expenses compared to families living in better insulated residences. For this reason, weatherization programs directed at improving the insulation of these mobile homes, such as was carried out recently in New Hampshire, should be encouraged.

Many of us are familiar with self-standing kerosene heaters such as those shown below. There is the torpedo type one often finds on construction sites or in warehouses or the stand-alone type one might find used for supplemental or backup heat in backwoods cabins, workshops or barns. The appeal of these types of kerosene heaters is that many designs do not require electricity to operate – some rely on wicks to draw kerosene to the combustion area and some, like the primus stove pictured above, require a manually pressurized fuel tank. Some modern stand-alone kerosene heaters have electrical fans to blow the warm air into the room but the main feature of these stand-alone heaters is that they aren’t vented. As such, the combustion products, largely water vapor and carbon dioxide, are released into the heating space. The danger is that improperly adjusted kerosene heaters can release the highly poisonous carbon monoxide, which could have deadly consequences. Any home or enclosure using a kerosene heater should, as a matter of course, be fitted with a carbon monoxide detector. Moreover, a window should be always opened a crack to allow some circulation and to prevent the buildup of carbon dioxide and other combustion products.

         Heat Stream 125,000 BTU Forced-Air Kerosene Heater                                  DuraHeat 23,000 BTU Kerosene Portable Heater

The kerosene-based home heating systems installed in mobile homes are not the unvented types shown above; modern units are fan-driven ducted systems which discharge combustion off gases directly outside. These are similar in design and configuration to home heating systems that use regular HHO.

Two grades of kerosene are available for sale. There is K-1 kerosene which low in sulfur (<0.05%) and higher sulfur K-2 kerosene (<0.5%). For unvented heaters, the K-1 grade is the recommended type. The K-2 grade is the type that is often used in mobile homes with vented heating systems. Like untaxed HHO, kerosene used for home heating purpose is dyed red to distinguish it from its taxed transportation equivalent

Data on kerosene sales for home heating applications is tracked by the Energy Information Agency (EIA) and historical data for NH is presented in the chart below. We noted in an earlier post that current HHO sales were off about 55% from their 2004 highs. We also see a decline for residential kerosene sales - but here the drop off is of the order of 90%!  NH kerosene sales continue to decrease – consumption  has decreased from 7 million to 2 million gallons per year just since 2010. (As a comparison, bear in mind that the HHO consumption in NH is of the order of 100 million gallons per year.) I am pretty confident that these numbers do not reflect a decrease in the number of mobile homes. Instead they indicate that folks living in mobile homes are making choices regarding their use of expensive kerosene.


This is not just a NH phenomenon. Residential kerosene sales are down across the entire US. This decrease intrigued me and so I chatted to a number of folks involved in the NH kerosene business and asked them about the decrease in kerosene sales data. As is typical in a case like this, there does not appear to one single reason for the decrease in usage. Instead a number of factors are at play but they are largely price-driven. Here is what I have learned:

  • Kerosene is more expensive than regular HHO so mobile home residents have sought alternatives. For a typical 180-gallon delivery, a resident can save $90 by getting HHO instead of kerosene. The low temperature clouding and gelling problems with outside storage tanks in winter can be combated by the addition of anti-gel additives that reduce the cloud point. These additives can cost $10 to $30 per tank and so there are savings for the resident. However, some oil suppliers have expressed concerns about poor mixing of the additive in a typical oil tank and question the effectiveness of these additives.
  • Some oil dealers will supply a blend of expensive kerosene and lower cost HHO to lower the cost of a heating fuel delivery. In these circumstances, it likely that the kerosene content gets lumped in with the oil numbers when data is reported - which then artificially decreases the kerosene consumption numbers.
  • Some kerosene users will switch back and forth between kerosene and HHO during the year to reduce their heating bills and will use kerosene only in the very cold winter months.
  • Many mobile home owners have converted old kerosene-based heating systems to electrical space heaters or propane systems. Sometimes these changes are done based on the belief that propane systems are better and some are driven to do so because they live in a community that does not allow the installation or replacement of an outside kerosene storage tanks.
  • The number of oil dealers supplying kerosene has declined. Fuel storage facilities, along with the associated tanks, pumps and piping are expensive, and many dealers have found maintaining kerosene inventories, along with the related storage and transportation logistics, unattractive in the face of declining sales.

In my last post, I noted that HHO is a dual purpose fuel. It is used as for home heating and, in its low sulfur diesel form, it is used for transportation: it is often the larger transportation market dynamics that ends up dictating the price for HHO. Kerosene is similarly a dual purpose fuel used for home heating and transportation. As noted earlier, in winter kerosene is added to diesel in order to extend the temperature range of the fuel. Far more significant, however, is its use as an aviation fuel. To give you a sense of the US market, in 2012 21 billion gallons of jet fuel were consumed, compared to 81 million gallons of kerosene consumed for home heating, commercial, industrial and farm use. The jet fuel market is 260 times larger.

In making inquiries about why kerosene is more expensive than regular HHO, it turns out to be more of a supply issue. Only about 10% of oil refinery production, see the table below, ends up as kerosene. This limits its availability and, on top of that, the strong demand for jet fuel  continues to increase.


Kerosene, in its jet fuel formulation, has another important use: it is used to generate electricity. A few weeks ago, PSNH reported that they were requested to fire up their 20 MW jet fuel generators located at the Merrimack station in Bow, Groveton and Tamsworth. This is generally a rare event and was driven by the lack of natural gas availability for power generation.  The challenge with these oil-fired generators is that the jet fuel is expensive compared to natural gas and coal so that they are really only backup units used to meet high peak demand operations. Some operations have converted their oil-fired backup units to run on cheaper natural gas. High oil prices also led to some operators reducing the amount of oil in their storage tanks, which left the region short of oil-fired backup generating capacity during the 2012/2013 winter when it was needed.

This winter, ISO-NE, the regional body responsible for coordinating the entire New England electricity market, instituted a Winter Reliability Program in which ISO-NE procured additional generating capacity from oil-fired operations such as PSNH. ISO-NE paid participants in the program ~$0.60/gal to keep fuel oil in storage to be available when requested. This program has been effective this winter and oil-fired backup capability has been available when needed. The chart below shows the generation of electricity in New England from different sources during the month of January 2014. Natural gas and nuclear generate most of the electricity in the region but the early January cold snaps had oil-fired generators kicking in (shown by the light blue line) and during the very cold weather towards the end of January, oil-fired generators were producing a lot of the region’s electricity. In fact, on Jan 24, 2014, oil was supplying 14% of the region’s electricity, as measured on a daily basis.


We have covered a lot of ground on this post, ranging from Primus stoves to PSNH’s use of kerosene to generate electricity, but here are the main takeaways regarding kerosene usage in NH:
  • Kerosene is a versatile fuel which is very useful in low temperature applications, such as blending with diesel in winter and for mobile homes with outside fuel tanks. However, its main use is as an aviation fuel.
  • Kerosene is ~$0.50/gal more expensive than HHO as a home heating fuel in NH.
  • Use of kerosene as a home heating fuel has plummeted over the past decade, driven largely by price.
  • Kerosene is a useful back-up fuel that can be used to generate electricity when natural gas supplies are constrained or prices get too high.
  • Finally, if you are planning a traverse of the South Pole or an ascent of Everest, you may want to start scouring yard sales for old Primus stoves.
Until next time, remember to turn off the lights when you leave the room.

Mike Mooiman
Franklin Pierce University

(*Kerosene Hat – The title of Cracker’s breakthrough 1993 album. I always enjoyed this group as I found many of their songs clever, catchy and some quite dark. Even though this tune is from their previous album, this is my favorite Cracker tune, Teen Angst. As an old folkie. I love the “what the world needs now is another folk singer, like I need a hole in my head” sentiment.)