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Board of Aldermen 08-13-2019 Page 16

R-19-158
Endorsers: Alderman Richard A. Dowd
Alderman-at-Large Michael B. O’Brien, Sr.
Alderman Ken Gidge
Alderman Linda Harriott-Gathright
Alderman Patricia Klee
Alderman-at-Large Brandon Michael Laws
Alderman Tom Lopez
Alderwoman-at-Large Shoshanna Kelly
Alderwoman Mary Ann Melizzi-Golja
Alderman Jan Schmidt
Alderman-at-Large Ben Clemons
Alderman-at-Large Lori Wilshire
APPROVING THE COST ITEMS OF A COLLECTIVE BARGAINING AGREEMENT BETWEEN
THE NASHUA BOARD OF EDUCATION AND THE NASHUA ASSOCIATION OF SCHOOL
ADMINISTRATORS AND SUPERVISORS, AMERICAN FEDERATION OF SCHOOL
ADMINISTRATORS, AFL-CIO FROM JULY 1, 2019 THROUGH JUNE 30, 2020 AND RELATED
TRANSFERS
Given its second reading;

MOTION BY ALDERMAN DOWD FOR FINAL PASSAGE OF R-19-158
MOTION CARRIED

Resolution R-19-158

R-19-159
Endorsers: Mayor Jim Donchess
Alderman-at-Large Michael B. O’Brien, Sr.
Alderman Ken Gidge
Alderman Linda Harriott-Gathright
Alderman Richard A. Dowd
Alderman Patricia Klee
Alderman June M. Caron
Alderwoman Mary Ann Melizzi-Golja
Alderman Jan Schmidt
Alderman-at-Large Lori Wilshire
AUTHORIZING THE MAYOR AND CITY TREASURER TO ISSUE BONDS NOT TO EXCEED
THE AMOUNT OF ONE MILLION THREE HUNDRED THOUSAND DOLLARS ($1,300,000)
FOR PROPERTY REVALUATION SERVICES
Given its second reading;

MOTION BY ALDERMAN KLEE FOR FINAL PASSAGE OF R-19-159 BY ROLL CALL
ON THE QUESTION

Alderman Klee

May | speak to my Motion Madam President?

President Wilshire

You may.

Board of Aldermen 08-13-2019 Page 17
Alderman Klee

Thank you. I’ve done quite a bit of work on this particular thing and | went back and forth; do | vote for it,
don’t | vote for it? It is worthwhile; isn’t it worthwhile? | made calls to the DRA and | spoke to them. My
last call that | made was on Monday and | spoke to Gary and in that conversation | asked him a number of
questions. One of the questions | did ask him was “I know you cannot compel us but will you”. And his
exact words were “We have been strongly recommending that Nashua must do a Full Measure & list”. |
was struck by the word “must”. | made him repeat it over and over again and he did. My feeling is you are
right, they cannot compel us to do this Full Measure & List but do | think that through other means that they
will do different things? Yes Ido. And then | think that the power will be taken away from this body and
this City and | don’t want to see that. | don’t want to see the State come in and tell us what we have to do. |
want to do that right thing and | believe that based on the claims, | believe we owe the property owners our
best effort to do the most that we can do. And | think this is one of the most things that we can do. Do |
believe that it will be 15%, 10%, 30%, 50%? | don’t have a clue. | don’t have a crystal ball. | get as many
people telling me they will not let them in their houses and unlike what some people have said it’s not just
because they didn’t pull a permit.

We have some people that are frightened to let a stranger into their home. | spoke to one woman and told
her that | would be there when they came; we would make the appointment and | would be there with her. |
am not offering that to every resident in Nashua because | do not have enough time for that. But yes | think
family members can be there, | think we can make sure that they will be safe and that there will be ID’s and
they have the right; the 4" Amendment does give them the right to say “no”. No one can come into
someone’s property. When | talked to the DRA, the DRA told me that yes you can look into the back of
someone’s property as long as you do it from the street. You can look at the outside of their home. You can
do drones to fly over; there are a lot of different things we can do. And | also agree that people who have
illegally pulled a permit will not let us in their homes; that’s just the way the game is played. | also think
there are some good people that are not going to let us in their home.

| spoke to one very concerned citizen who said that she just doesn’t like strangers. It affects the whole feel
of her home so she doesn’t let strangers in her home; this is a very good person, a very honest person. So
| do not want anybody out there to feel that for whatever reason they say “no” we are going to think that
they are trying to hide something. But | still believe, having said all that, we need to do this Full Measure &
List and when | heard the strong recommendation that we must do a Full Measure & List | felt that was a
very — and he said they had been recommending it for quite a while. He said Manchester does it just about
every 5 years and Concord, like Nashua, has waited decades and he thinks that they should do it also. So
we all have our own vote, but | will be voting for a Full Measure & List and passing the $1.3 million dollars.
Thank you.

Alderman Lopez

I’d like to each Alderman Klee’s comments with regards to the intent of letting people in and out of your
home. | know that about a month ago | asked to have my air conditioner looked at because it wasn’t
working and the guy showed up right when my cat threw up so | was not, | was like “you’ve got to give me
some time”. So the timing could be completely benign, and yet poor for somebody. So | don’t want to cast
anything on people who might not feel comfortable letting someone in their home. | also know that
particularly in Ward 4 there are like 15 million people like pretending that they are utility companies and
they are not. They are just trying to get money or enter into some kind of deal. So | don’t know that the
neighborhoods that | represent will be particularly receptive to a Full Measure & List but | do know that
some of them will. | know that I’ve had feedback from some people saying that, to my surprise that they
were ok with their property value being raised; they were ok with their property reassessment. To me, |
would have expected everybody to automatically want the lowest possible value for their home so they pay
the least taxes. But some people are willing to pay their taxes because they feel like it is part of their
community responsibility. Some people take pride in their home and the additions that they do and may
want to show that the value is increasing.

Board of Aldermen 08-13-2019 Page 18

So | have gotten feedback on all ends of the spectrum here. | have had people who feel like we could be
doing many, many better things with $1.3 million dollars. Somebody suggested we turn the park that
everybody thinks is splash pad into a splash pad, fix the elevator. Like I’ve got a laundry list of better things
we could do and it is true that there are better uses in many ways for this. But | feel like Pandora’s Box has
been opened here. I’ve been hearing since | became an Alderman all four years ago that we needed to do
a Full Measure & List. | was not happy about having to do one last minute because the State required one
in terms of a General Assessment but | do think that this is something we’ve known we would have to do.

It is not a surprise to anybody that after 28 years we do need to do one. | think if with that Alderman Klee
and what Ms. Kleiner have understood to be the case, if we are going to have to end up having to pay for
this other ways, I’d rather just do it right now then doing it wrong later. These are the same concerns | had
when we were talking about the huge paving project. At the time | didn’t want to spend that much money
on paving and | wished we could figure out how to stagger it out or spread it out. And fast forward to 3
years later and how many sinkholes later, | think we got at it at just in time.

So | am in favor of it only because | think we need to be forward thinking. | am conscious of what the Mayor
said in that we are only going to be putting this out to bid but we need to allocate money first in order to do
that. | would like to see more reporting to the Board of Aldermen with regards to the process. But |
understand that this looks like something that does need to be done. And then finally | would like to just
acknowledge the Assessing Department. It can’t be easy being under all this scrutiny, having the
Telegraph showing up to interview everybody; having people following staff members around; having the
constant political scrutiny that that office has been under. | appreciate the job that you guys are doing and |
appreciate the duress that you are doing it under. And | don’t think the Full Measure & List is necessarily
an indictment of anything that you’ve been doing. | think it is a long overdue process and | appreciate your
support for it.

A viva voce roll call was taken which resulted as follows:
Yea: Ald. O’Brien, Ald. Gidge, Ald. Ald. Dowd,
Ald. Klee, Ald. Laws, Ald. Lopez Ald. Caron,
Ald. Kelly, Ald. Jette, Ald. Melizzi-Golja
Ald. Teneza, Ald. Schmidt, Ald. Wilshire 13

Nay: Ald. Clemons 1

MOTION CARRIED
Resolution R-19-159 declared duly adopted.

UNFINISHED BUSINESS — ORDINANCES

O-19-046
Endorsers: Alderman Richard A. Dowd
Alderman Jan Schmidt
Alderman Linda Harriott-Gathright
Alderman-at-Large Michael B. O’Brien, Sr.
AMENDING THE ZONING MAP BY REZONING 610 AMHERST STREET FROM PARK
INDUSTRIAL (PI) TO GENERAL BUSINESS (GB)
Given its second reading;

MOTION BY ALDERMAN DOWD TO AMEND O-19-046 IN ITS ENTIRETY BY REPLACING IT
WITH THE PROPOSED AMENDMENTS MADE BY THE PLANNING & ECONOMIC DEVELOPMENT
COMMITTEE

Special Bd. of Aldermen — 08/06/2019 Page 6

We have so far constructed over 8,000 solar energy systems and complimentary technologies as well to enable
buildings, municipalities, private homes to be non-reliant on fossil fuels and energy, self-sufficient instead. Our
Mission is to help this region, New Hampshire is where we do about half of our business. We began up in
Maine, we do also work in Massachusetts as of the last 2 years. Our Mission is to help our communities make
the transition to self-reliance, to clean renewable energy and to protect the things we value; clean air, clean
water, clean land in the process. We will focus naturally on solar at this point but any chance we get to educate
folks around the stead of complementary technologies that do in fact make it possible for individuals but also
communities to lessen their reliance on imported energy through some of these complimentary technologies.

A couple of the non-profits and municipalities we have been honored to work with and with and | would point out
just across town from here, the Nashua Soup Kitchen and Shelter was one of our first local projects two years
ago. | am very proud to be helping them save money through this purchase agreement which | will describe in a
little more detail ina moment. On the commercial side we also work with a number of good businesses in New
Hampshire and in the region. We can go into detail if you’d like on other municipal projects that we’ve done but
just a couple of examples here in New Hampshire which are similar in scale or type of technology to what we
are proposing for Nashua. Again we are happy to provide details and references if you'd like.

Finally we were proud two weeks ago to be named again for the third consecutive year the Number One Solar
Installer in New England and we have received some other honors. We are part of a growing community with
close to 1,000 solar jobs in the State. Many good contractors that we consider partners and we do expect in the
coming years to see many more added as well.

| am going to give a quick overview of how we settled on the two recommended sites for 2019. Ask James who
runs our construction end of the business, actually building the systems to provide a little bit more detail and
answer technical questions you may have about the types of installations and then I'll return to the all-important
financials for this proposal.

As you heard from the Mayor and from Deb there are a lot of City rooftops that are potential candidates for solar
down the road. | am not zooming in all of them here by any means but three main areas that we focused on
with a starting list at the outset of the PPA several months ago of 24 city properties clustered in downtown
Nashua, out at the Waste Water Treatment Plan and at the DPW and Transit Garages. We did do careful
assessments of 10 of the initial 24 after doing some initial assessments of all 24. The two highlighted are the
ones that we are recommending at this point. But just for your interest to give a sense, at the top the first five
are what we defined as the maximum value opportunities.

These are projects with fairly substantial scale, economy of scale as the Mayor mentioned do certainly matter in
terms of the economics of these projects. But through an extensive vetting process over several months, we did
narrow down to these two projects which again is not to say that we wouldn’t love to see Nashua with us or
other solar companies install on many other roofs. But in many cases roof age was a concern as much as we
can put panels on a 15 and 20 year old roof and sometimes if the owner is preparing through some resealing of
seams that does make sense, but generally we don’t recommend it on roofs of that age. We would rather wait
until they are replaced, so that was the primary reason why these projects, the ones not highlighted were
excluded from the portfolio, but we can provide more detail if you wish on others.

Needless to say there is a lot of opportunity and should the City determine after a first wave that it makes sense
to add, we certainly would love to see the City do so with us or with other contractors. Let me turn over to
James to provide a little more detail on the two highlighted projects. We can also speak to Conway if you wish
although we felt it appropriate to focus on the two city-owned buildings for tonight.

Special Bd. of Aldermen — 08/06/2019 Page 7

James Hasselbeck Thanks for that overview Dan and thank you everybody for the time this evening. So as Dan
mentioned, my role is to oversee our design, estimating, construction and operations and maintenance arms of
the company. | am a construction guy so | am happy to get into the weeds particularly of any concerns the
Aldermen may have on any of these projects and hopefully address them. So the first building we wanted to
focus on is a really great opportunity here at the Transit Garage. So what we see here is obviously an
overhead image, each of those little blue rectangles represents one individual solar panel. Each solar panel is
roughly 3 % feet wide by about 5 % feet tall. So we are right around 19 % square feet. On this type of roof, a
flat, EPDM or rubber sealed roof, we do not penetrate that roof surface and that is really important. My team is
a bunch of engineers, plumbers and electricians. We are very, very interested in building solar energy systems
and not at all interested in owning roofing warranties.

So we work, but obviously as you can imagine a key part of our business, so we work extremely closely with all
the major roofing manufacturers prior to our installation. If you in the procurement or construction world, you
may be familiar with something called a submittal process. So we do something fairly similar; so prior to any
installations we get ahold of the existing warranty holder on the roof, whether it is the roofing manufacture or the
roofing contractor. We basically submit to them the details of the racking manufacturer that we are going to use.
All of the big roofing manufacturers have a very specific process in place where they basically review and then
confirm that the products that we are using will not void the warranty. That is a crucial piece of us; sometimes
there are inspections involved and there are certainly a lot of back and forth that we undertake. But the key
takeaway for this group | think is that the work we are doing here will not be putting holes in these roofs and we
will not be impacting any existing roofing warranties. There is a documentation stack about this thick that we
provide at the end of the project.

So how this works, we are not putting holes in the roof, so what we are doing is we are doing a lot of smart
engineering and we use what is called a ballasting system. So basically, we are using, wait | don’t know what
photos you have there, yeah so you can see in some other similar projects we have Contemporary Automotive
over in Milford, Tupelo Music Hall, and the Wirebelt just up in Londonderry. But basically we have determined
that by strategically placing a very specific quantity of concrete ballast blocks in a very specific weight structure
that that provides enough downward pressure to hold the solar panels secure. It adds anywhere between 4 to 7
pounds per square foot of dead load to that building; the differences is based on the wind load and the building
factors. Part of our due diligence as Dan alluded to, we also do a structural engineering review of each building.
So we go in with our professional engineer, take a look at the building structure and confirm with 100% certainty
that everything that we are doing is structurally sound. | guess that’s kind of it.

Mr. Weeks And | would just point out that the production data you see the array, the capacity, that’s the DC
Direct Current Capacity of 103.9 kilowatts, 297 panels and then really the important number there is the power
output 106,500 kilowatt hours per year. A quick word on how we come up with those projections?

Mr. Hasselbeck Sure so you can see the graph in the top right corner and it is difficult to see the things on the
bottom but on the left hand access, vertical access, that’s the production quality on a monthly basis and our east
to west access is months starting in January and ending in December. So as you can see, we see very low
production in December, January and February because we are basically assuming that those arrays are going
to be covered in snow and it not worthwhile for anybody to get out there and shovel these rooftops. So basically
we just model out that production and how we get to that modelling is using some industry standards software;
it’s not our own guessing. It’s a program called Helioscope which is vetted by both the National Renewable
Energy Laboratory and a lot of financial institutions that invest in these projects. We are able to provide really
accurate production data by utilizing existing weather data from this area. | think our ticket is in the Nashua
Airport for this specific site; so very detailed, historical weather data over 30 years in town. Then we look ok
here’s our system, here’s the pitch of the panels, the orientation of the building to provide a really accurate idea
of what we can expect for power generation.

Special Bd. of Aldermen — 08/06/2019 Page 8

The other thing that we consider as far as our design goes is long term longevity and usability of that building so
you will see on the Transit Garage, it is kind of a funny shaped array. Well we want to make sure that this
system is going to be operational for 30 plus years. In that time frame all of those little boxes there, those are
HVAC units, air conditioners, compressors, they are going to need to be replaced, they are going to need to be
maintained, they are going to need to be accessed. So we want to make sure in our designs to account for that
so future City maintenance, totally outside of the project, outside of the solar project is not negatively impacted.
So that is the reasoning for the kind of broken up array there.

Mr. Weeks And just for your interest before moving to the next building, we do have on this overview slide the
percent offset of these facilities, you see load offset the right most column and for that Public Works Garage that
projected output, power output amounts to about 70% of the power consumption. | can speak in more detail to
Alderman O’Brien’s question about net metering. But in brief, that is a fairly ideal arrangement where all of the
power will be used behind the meter sort to speak on an annual basis, with a little bit of surplus power generated
during the peak summer months, less than what is consumed obviously during the lowest production winter
months. But you will be getting the equivalent of full value for nearly 100% of the power because as a “small
customer generator’ a system below 100 kilowatts AC, that’s the AC inverter rating, | can differentiate a little
more detail if you’d like. But as a defined small customer generator, the net metering statute provides for the
ability to use that power anytime within a monthly billing cycle; meaning a peak summer day like today where
you overproduce, will provide power that you use next week when it is raining within the same billing cycle or at
night when the HVAC and the lights may be on. So we can elaborate in more detail if you would like but being
at close to but below 100% is really an ideal place to be in terms of the value of solar electricity and both of
these facilities are 70 and 81% a nice place to be. James, the Fire Station?

Mr. Hasselbeck Sure so this was the second project that we identified that would provide the greatest economic
and environmental value to the City on the Lake Street Fire Station. So it is a beautiful building and here we are
looking at a more conventional pitched roof. So here again it is a metal standing seam roof, so if you are
familiar they are metal plates with these kinds of little seams that are visible. Those are our favorite kind of roofs
to work on in New Hampshire for two reasons. One, they last forever so there’s no issues about roof longevity
and two, we are also not penetrating these metal roofs. We work with a couple different manufacturers who
design and supply these types of clamps and they clamp directly onto the seams themselves. So instead of
penetrating through the roof membrane and into the structural surface of the building, we are clamping on to
those seams to give us the structural integrity we need to support the solar array.

Here, because we are not relying on concrete blocks, the dead load is significantly less. So these systems we
are only adding anywhere between 2 to 3 pounds per square foot. Even so, we still run through the same type
of professional engineering analysis to confirm the structural suitability of the building. So this is a very straight
forward install again, the big concerns that we always get is “what is going on with my roof warranty”. We are
going to be able to maintain that, we are going to be able to utilize a variety of different roof surfaces; you see
we are not putting solar panels on the northern side of things focusing on the most productive sections of the
roof and it is fairly straight forward from our perspective, these are very simple installations.

Mr. Weeks And | would note again that 126.8 KW that is the DC the panel rating. That is each of the 409
panels times their wattage of 310 watts. That is again, the DC rating, the AC rating, we have capped
strategically at 100 kilowatts to retain that small customer generator classification which increases the value of
every kilowatt hour that we export.

Mr. Hasselbeck | think that that’s a really excellent point. Solar frankly is quite complicated. We are trying to
balance economics, we are trying to balance environmental goals and we are trying to balance often rapidly
changing State and Federal Policy.

Special Bd. of Aldermen — 08/06/2019 Page 9

So it’s basically our job to figure out what the best end result is, taking all those factors into consideration which
is why we landed on these first kind of few buildings here to kind of strategically maximize both the financial and
environmental benefits to the City.

And just a few examples of pitch roof installations what we are more familiar with seeing in our community is the
flush mounted arrays on these pitched roofs. In the lower right you see a similar standing seam metal roof. It
will rise about 3 inches above the seam so plenty of room for airflow and a very straight forward installation.
Dartmouth College in the upper right also uses primarily standing seam roofs, we have done about 20. So solar
systems have 3 primary components; the solar panels which generate the electricity and DC power, the racking
which is our method of attachment to the building or the ground area and then the inverters. So the inverters
are kind of the work horses of this system. So the inverters take that DC power generated by the solar system
and convert that into usable AC electricity that then gets fed into that building’s electrical system.

So high-level overview of how it works is when those solar panels are generating electricity, the inverters input
that power at the same voltage that building typically would use. So in these cases we are talking about three
phase, 480 volt power. The building will use that solar energy first and any excess power that the building
needs that the panels are not generating will be pulled in from the utility just like it is normally. But as Dan
mentioned, there is also going to be times when the solar panels are generating more power than that building
is using at any given moment and in that case the excess goes out into the grid taking advantage of that net
metering regulation that the Public Utilities Commission has made law and providing credits to that utility
account.

The other really neat thing about the inverter technology and the systems that we have designed here is it gives
us also a very high level of visibility into each individual solar panel. So we are using something called Solar
Powered Module Level Electronics, but basically it provides two key benefits; safety primarily for first responders
in the event of an emergency and then data monitoring access. So what that means is that | am able to see
each individual solar panel in what we call a data monitoring portal. And | am able to make sure that that
individual panel is performing up to our expectations and meeting the warranty obligations as well as our
production estimates. That also provides a ton of opportunity to take that data, which there is a huge amount,
and utilize it in other initiatives in the town. We have had great success with other municipalities by integrating
some of that data that we are able to pull from the solar energy systems into local educational curriculum as well
as helping provide really hard output data to achieve any carbon off-set goals that the City has. So we are
going to be able to provide that.

The other benefit | mentioned is safety. Safety is a major thing that we think about all the time, right? So the
other advantage of these power level electronics is in the event of an emergency, we have one switch, you can
see some disconnects out there. These big gray boxes are all disconnects, one switch gets turned off in every
single solar panel within 30 seconds goes to 0 volt or less than 15 volts so effectively 0. So if there ever was an
incident on that roof where first responders needed to get up there to put out a fire or do anything else, we want
to make sure that they are protected and not working around live PC electricity and these designs take that into
account.

Just a rundown of the major components, we spoke about these, if you’d like to know more just a little more
detail on the two primary components, the solar panels and the inverters | do want to add a word on the
technology we use. It’s hard for me to add one word but long story short, we at ReVision Energy we take our
engineering and system designs extremely seriously. So we are New England based company, we live and
work in these communities. Every solar panel, every inverter is not manufactured equally. We focus exclusively
on what we call and what the industry calls Tier 1 Components. So Tier 1 means that we and our partners have
gone through some pretty strict quality vetting processes, not just on the manufacturing but also on the finance
ability and bankability of that particular company.

Special Bd. of Aldermen — 08/06/2019 Page 10

As on a previous slide that Dan showed, there is really some long term warranties for many of these products;
25, 30 years and a really long commercial life. Well that’s only helpful if that company is around to service that
warranty. So we are very serious in the products that we recommended because ultimately we, ReVision
Energy, are standing behind it. The other advantage we have is we run our own, we call it the Operations &
Maintenance Division so | have a team of 9 Master Electricians who go around and maintain our 8,000 systems
that we have been building for over 14 years. That also gives us some great insight into what does go wrong
with these systems over 10, 15, 20 years so we can then integrate that knowledge into both our component
choices and new system design engineering to try and solve the problems that we are identifying in older
systems. Sorry | couldn’t do that in word.

Mr. Weeks Cheers. We've thrown a lot of info on you in terms of design and engineering. This final slide is a
quick window into the process that our team goes through. Do you want to wrap it up?

Mr. Hasselbeck Yeah so frankly the construction is the easiest part of this project. For the Fire Station | think
once we actually started construction we would be in and out of there in roughly 3 weeks; between 3 and 4
weeks on the other building there. So the bulk of the work that we are doing is right now; the finalizing our
engineering and design, working with the utility on what is called the Interconnection Application. That makes
sure we don’t run into any of those net metering issues. So we do all that stuff. Our structural engineering to
confirm that the buildings are sufficient capacity wise; coordinating with the roofing manufacturers making sure
that warranty gets maintained; procurement you know it is, have you heard about these tariffs? That has made
my life very, very difficult. It is very difficult, but that’s a different meeting. The procurement is another piece that
we have to start very early. So basically the bulk of our work is in those three big orange lines that you see and
then we kind of have anticipated roughly 3 to 5 weeks of actual physical construction once we start. So we are
quite anxious to get moving on these projects in the near term. We have already kind of in a gesture of good
faith we have started the Interconnection Application process. We have started the structural review process
and | have, you know, our vendors you know anxiously awaiting purchase orders for this equipment so we can
kind of meet these construction time lines which actually provide a financial benefit if we get it done and
operational in 2019 which | think you can get into.

Mr. Weeks | think that gives you quite a bit of information but we are happy to take questions regarding the
design and engineering and then we can get into the finances. Yes sir, we can perhaps work our way around.

President Wilshire

| am going to call on people; | am going to start over here with Alderman Clemons. Thank you.

Alderman Clemons

Just a question construction wise can you do this up to when the snow flies or what is your limitation?

Mr. Hasselbeck So yes is the short answer and yes for a variety of reasons. One it is actually really important
for us as a business to provide 12 months employment to all of our co-owners. So we work right through the
winter. What gets challenging once the snow flies is the ballasted flat roofs. So if we were getting close to the
snow season | would make sure that we built that building first and then we would move to the Lake Street Fire
Station second.

Special Bd. of Aldermen — 08/06/2019 Page 11

Alderman Clemons

Ok thank you.

Aldermen Jette

So is the purpose to provide the electrical for the electrical needs of the building on which the solar panels sit
more than generating electricity that could be used elsewhere. | mean I’m wondering why we are putting them
on buildings to begin with, | mean why not put them on like a solar farm, on land. You’d avoid all the problems
with roofs and whether the building can support it and all that stuff.

Mr. Weeks Good questions; we do all of the above. The value of doing rooftop solar is that when you use that
power onsite, beyond the meters sort to speak, you are off-setting full retail priced electricity, power you would
otherwise have to buy from the utility at that moment in time. In practical terms that can mean a premium on a
per kilowatt hour basis of anywhere from 10 to 30%. So it is higher value when used onsite. That said, naturally
when you have multiple acres to work with you get terrific economies of scale and the build costs do come down
commensurate with that. We are pleased to be in discussion, it is still fairly early stage that Deb has facilitated
with the Nashua Airport Authority which has several unused acres to the far west of the runway and that is
certainly a possibility for 2019 where the City could generate multiple megawatts of power to offset the
equivalent of dozens of buildings.

Alderman Jette

Thank you.

Alderwoman Kelly

Yes so you mentioned a couple of times the small customer and | was just wondering is that per each project or
is it combined, if we add more do we end up above that at some point.

Mr. Weeks It is strictly on a per-meter basis. So if a building had multiple meters you could have multiple small
customer generators at that site. So it would not be impacted by adding any future projects in the City.

Alderman Laws

First of all thank you guys this is awesome, what you are doing is can’t be overstated how important the work
you are doing is and | appreciate it. That being said, | am kind of dumb and | have a couple of questions. So
you kind of answered the question | had about snow and it is surprising that there is not technology that exists
that melts the snow off of the solar panel. Does that exist, is it just cost prohibitive?

Mr. Hasselbeck Sure great question and we go back and forth all the time. Long story short, it is not
worthwhile. So there are products and technologies out there which utilizes you know low voltage current to get
up there and melt the snow to keep the snow off the arrays. But as we all know as New Hampshire residents, in
the winter months, you know, December, January, February, that sun may be out two or three hours a day right.
So basically the energy and cost of that energy required to melt that snow is significantly less than the additional
electricity that you would get from having clear solar panels through that time of the year.

Special Bd. of Aldermen — 08/06/2019 Page 12

Alderman Laws

Thank you and speaking of technology, it tells us that 18 months from now there is going to be cheaper or
smaller solar panels right?

Mr. Hasselbeck It tells us that about computers.
Alderman Laws

Ok but it has nothing to do with this technology?

Mr. Hasselbeck It actually doesn't.

Alderman Laws

Is it upgradable if there is new technology that comes out?

Mr. Hasselbeck Sure, awesome question. So I’ve been in the PV Industry for 12 years which actually makes
me like really old for the PV Industry so that’s kind of cool. But in that timeframe we certainly have, don’t get me
wrong, we have seen significant improvement in that technology. But not a huge quantity, nothing like More’s
Law on efficiency of the panel. That efficiency has gone up, certainly from roughly you know 12 to 13%, 10 plus
years ago; to now we are seeing 18 to 19%. But the biggest driver of this explosion in solar energy that we
have experienced in New Hampshire and Nationally is not increases in efficiency, it is reductions in
manufacturing cost. So as that demand has gone up, what we have seen is the manufacturers have ramped up
to meet that demand, significantly reducing the cost.

So while the technology has improved, that has not been the biggest driver there, it is additional manufacturing
capacity and lower costs there. So the solar panels themselves, as Dan mentioned, you know they have a 25
year warranty and a 40 year lifespan. There is very little reasoning from what we’ve seen to update those
panels. You know these things are going to pay for themselves in a few years and then you are just getting free
electricity. And what we would see and this is now me speculating a little bit, but | do expect to see some
improvements in the inverter technology.

So if we think about the system, the solar panels are kind of dumb; it is glass, aluminum and silicon just sitting
there. You know electrons are hopping up and down making power. The brains of the operations is within that
inverter. So | certainly expect, during the lifetime of these systems, to see improvements in that inverter
technology which basically allows them to interact more intelligently with the utility grid; things like demand
response. In those cases the inverters are actually quite easy to swap out. So you don’t have to touch any of
that work on the roof and in 10 or 15 or 20 years if we wanted to improve our inverter technology, that would be
a very easy change.

Mr. Weeks And | will just note, you will see the financials in a moment, we do model a full replacement of the
inverters on each of these systems mid-way through the system life. We just assume that is an expense you
will have at some point during the system life, so we have included that in the financial model.