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constellation.com

https://constellation.com· First analyzed 28 Apr 2026· Updated 28 Apr 2026
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constellation.com
Desktop screenshot of constellation.com
Mobile screenshot of constellation.com
Mobile

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Hosting Provider

CONSTELLATION ENERGY GENERATION, LLC

IP Address

159.214.199.37

Site Location

🇺🇸 United Statesvia ip

Server Location

🇺🇸 Oswego, United States

ASN

AS10953

Organization

CONSTELLATION ENERGY GENERATION, LLC

Server

Apache

CDN

Azure Cdn

Nameservers

ns1-35.azure-dns.com.ns2-35.azure-dns.net.ns3-35.azure-dns.org.ns4-35.azure-dns.info.

Performance

74

Core Web Vitals

Weight

First Contentful Paint
4.1 s10%
Speed Index
5.3 s10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
4.3 MB
60 requests
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Frontend
Styling
Bootstrap
CMS
Adobe Experience Manager
Infrastructure
Hosting
CONSTELLATION ENERGY GENERATION, LLC
CDN
Azure Cdn

Technology Stack

10 Technologies Detected

CSS Frameworks

2
Bootstrap
Tailwind CSS

Frameworks

1
Angular

Libraries

1
jQuery

Other

1
Modernizr

Icon Libraries

1
Font Awesome

Analytics

1
Google Analytics

Tag Managers

1
Google Tag Manager

Reviews

1
Trustpilot

Web Servers

1
Apache

SEO Analysis

B70/100
19
8
1
Meta Tags15/15
Content12/12
Headings3/8
Technical20/25
E-E-A-T0/7
Images2/7
Links5/5
URL5/5
Social4/5
Freshness0/4
Mobile1/4
Indexability3/3
C
constellation.comconstellation.com

Electricity Provider & Gas Supplier | Constellation

Join millions of residential, public sector & business customers who use Constellation as their trusted electricity & natural gas supplier. Compare rates.

Title Length51 chars

Recommended: 50-60 chars (~297px / 580px)

Description Length154 chars

Recommended: 120-160 chars

Issues (1)

  • • Missing H1 tag — every page should have exactly one H1

9 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

396 URLs

robots.txt

7 rules

Sitemap reference found

Local SEO

Local Search Readiness

21/100
Needs Work
6 10 2

Sponsored

AI & LLM Readiness

D49/100
Bot Access
20/25
Machine Read.
14/25
Schema Data
0/25
Citation
15/25

AI Bot Access

14/14 accessible
AI Search
OAI-SearchBot
PerplexityBot
Claude-SearchBot
Gemini-Deep-Research
DuckAssistBot
Training
GPTBot
ClaudeBot
Google-Extended
Meta-ExternalAgent
Bytespiderinfo
Amazonbot
Applebot-Extended
CCBotinfo
Fetch
ChatGPT-User

Machine Readability

llms.txtvalid
llms-full.txt
Semantic HTML
Heading Hierarchy
nav
Text ratio:4%
Words:1,599
Token eff.:Optimal
Depth:1/5

Structured Data

Microdata

Citation Readiness

Opening Summary21w
Descriptive Headingsavg 3.2w
Canonical URL
Open Graph2/3
Twitter Card3/3
Language Tag
Publish Date
Author Info
Lists
Tables
TL;DR / Summary
About Page Link
Recommendations (12)
AI readiness recommendation preview...
Upgrade to view recommendations

Sponsored

Accessibility

WCAG 2.1 Compliance

Evaluates how accessible your website is for users with disabilities, based on WCAG 2.1 guidelines. Checks images, forms, keyboard navigation, ARIA roles, and color contrast.
B
72/100
11
Passed
5
Critical
1
Warnings
Images & Alt Text
15/20
Checks if images have descriptive alt text for screen readers and visually impaired users.
Semantic Structure
11/20
Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.
Forms & Inputs
10/15
Verifies form fields have labels, error messages are clear, and inputs are properly associated.
Color & Contrast
15/15
Tests text-to-background color contrast ratios against WCAG AA/AAA minimum requirements.
Keyboard & Focus
11/15
Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).
ARIA & Roles
10/15
Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
4 recommendations
  • •Accessibility recommendation preview...
Upgrade to view recommendations

Carbon Footprint

SWDM v4 · Eco-Score

Carbon emissions estimated using the Sustainable Web Design Model v4 (SWDM v4). Factors in data center, network, and device energy across new and returning visitors. Grade thresholds based on HTTP Archive percentiles.
15/100
F
546 mg
CO₂e / view
4.3 MB
Page Weight
15%
Cleaner Than
New Visitor
624 mg
vs
Returning (cached)
312 mg
Annual (10K/mo)
65.5 kg
Emission Segments
Data Center
122 mg
Network
131 mg
Device
293 mg
Resource Breakdown
JavaScript
364.9 KB
Images
3.5 MB
CSS
442.8 KB
HTML
24.5 KB
Other
1.7 KB
Green Hosting Not Verified
CONSTELLATION ENERGY GENERATION, LLC
7 recommendations
  • •Carbon footprint recommendation preview...
Upgrade to view recommendations
D

Security Score

41%Poor
Interactive

HTTPS

No WAF

185d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

DigiCert Inc

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.2

HTTP Protocol

HTTP/2

Valid From

15.04.2026

Valid Until

30.10.2026

OCSP Stapling

Enabled

Subject Alternative Names (20)

www.constellation.comconstellation.comadmin.constellation.comrenew.constellation.comsignup.constellation.comsmallbusiness.constellation.commy.constellation.comwww.my.constellation.com+12 more

SHA-256 Fingerprint

96:00:04:DC:B0:45:66:06:89:B2:18:A0:3B:BA:7D:C4:1E:71:FF:76...

Top Recommendations

Security recommendation preview

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Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges
bytes
age
398168
content-encoding
📦 Gzip(gzip)
content-type
text/html;charset=utf-8
date
Tue, 28 Apr 2026 08:36:06 GMT
etag
"382f1-650246a9fa138-gzip"
Good Warning Issue

Email Infrastructure

Microsoft 365

Score

93

SPF
DKIM
DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (1)

constellation-com.mail.protection.outlook.com

Domain Information

constellation.com

Domain Age
29y 7m

Created

24.09.1996

Expires

28.02.2027

Last Updated

24.02.2026

Registrar

CSC Corporate Domains, Inc.

DNSSEC
Not Enabled

Privacy & Compliance

OneTrust

Cookie Consent Banner
OneTrust
Privacy Policy
Terms of Service

GDPR Indicators

Cookie consent banner detected
CMP: OneTrust
Privacy policy page linked

Mobile Compatibility

Viewport & Responsive Test

Tests how well your website works on mobile devices. Checks viewport configuration, responsive layout, touch targets, font readability, and simulates rendering across different screen sizes.
C
63/100
Mobile Friendly1 breakpoint
Viewport Meta
The viewport meta tag tells mobile browsers how to scale the page. Without it, mobile devices render at desktop width.
Responsive Design
Uses CSS media queries or flexible layouts to adapt content to different screen sizes automatically.
Touch Icons
Apple touch icons and favicons displayed when users add the site to their home screen on mobile devices.
Readable Font Size
Base font size should be at least 16px on mobile to ensure text is readable without zooming.
Relative Units
Using em, rem, %, or vw instead of fixed px values allows content to scale properly across screen sizes.
No H-Scroll Risk
No elements wider than the viewport that would cause horizontal scrolling on mobile devices.
Tap Targets OK
Interactive elements (buttons, links) are at least 48x48px with enough spacing to prevent accidental taps.
No Fixed Widths
No elements with fixed pixel widths that could overflow on smaller screens and break the layout.
Viewport
width=device-width, initial-scale=1
2 recommendations
  • •Mobile compatibility recommendation preview...
Upgrade to view recommendations

Typography & Readability

benton-sans + Benton Sans Book

WCAG Partial
52/100
Readability
/30
18/30

11px · LH 1.50

Hierarchy
/20
5/20
WCAG
/25
16/25

1:1 min contrast

Performance
/25
13/25

2 fonts · 1 req

Heading Font

benton-sans

Sans

Body Font

Benton Sans Book

Sans11px

Contrast Ratio

1:1

9 issues

Reading Comfort

~45 CPL

Narrow lines
32px
h2
25px
h3
11px
p

❌ Critical: 11px body text is too small. Minimum 14px, recommend 16px+.

✅ Optimal line spacing: 1.50 ratio (ideal range 1.4–1.6).

⚠️ Partial contrast: 9 elements below WCAG AA threshold (min 1.0:1).

❌ Missing H1: Every page should have exactly one H1 element for SEO and accessibility.

⚠️ Text justify detected: Justified text creates uneven word spacing, hurting readability on web.

✅ Lean font stack: 2 font families keeps load times fast.

Buy on MyFonts

Color Palette

12 unique colors
Light
#ffffff
Background· 19.1%
#1e5b93
Accent· 14.600000000000001%
#11497c
Primary· 12.8%
#69908d
Secondary· 8.1%
#091d37
Accent· 7.9%
#f0f2eb
Secondary· 6.3%
#0c2a4a
Primary· 6.1%
#3371a7
Primary· 6%

Business & Marketing Stack

3 Tools Detected

Advanced

Behavior Analytics

2
Google Tag ManagerFree
Google AnalyticsFree

User behavior and product analytics

Reviews & Social Proof

1
TrustpilotMid-Market

Customer reviews and testimonials

2

Categories

3

Total Tools

0

Enterprise

1

Mid-Market

Assessment: Well-developed marketing technology stack

Sponsored

Scripts & Styles

23 Resources

20
Scripts
3
Styles
11
Async
1
Defer

Top Script Sources

assets.adobedtm.com(8)local(4)googletagmanager.com(2)gstatic.com(1)rum.hlx.page(1)

Website Identity

constellation.com

1-855-585-3935
29 years old
Location detected: 🇺🇸 United Statesvia ip
CSC Corporate Domains, Inc.📧 Microsoft 365en-US

Sponsored

Last analyzed: 28 Apr 2026 at 08:36

Historical Analysis & Change Tracking