diff --git a/src/greenmountainpower/__init__.py b/greenmountainpower/__init__.py
similarity index 100%
rename from src/greenmountainpower/__init__.py
rename to greenmountainpower/__init__.py
diff --git a/src/greenmountainpower/api.py b/greenmountainpower/api.py
similarity index 100%
rename from src/greenmountainpower/api.py
rename to greenmountainpower/api.py
diff --git a/src/greenmountainpower/exceptions.py b/greenmountainpower/exceptions.py
similarity index 100%
rename from src/greenmountainpower/exceptions.py
rename to greenmountainpower/exceptions.py
diff --git a/poetry.lock b/poetry.lock
new file mode 100644
index 0000000..5fec10f
--- /dev/null
+++ b/poetry.lock
@@ -0,0 +1,337 @@
+[[package]]
+name = "attrs"
+version = "22.2.0"
+description = "Classes Without Boilerplate"
+category = "dev"
+optional = false
+python-versions = ">=3.6"
+
+[package.extras]
+cov = ["attrs", "coverage-enable-subprocess", "coverage[toml] (>=5.3)"]
+dev = ["attrs"]
+docs = ["furo", "sphinx", "myst-parser", "zope.interface", "sphinx-notfound-page", "sphinxcontrib-towncrier", "towncrier"]
+tests = ["attrs", "zope.interface"]
+tests-no-zope = ["hypothesis", "pympler", "pytest (>=4.3.0)", "pytest-xdist", "cloudpickle", "mypy (>=0.971,<0.990)", "pytest-mypy-plugins"]
+tests_no_zope = ["hypothesis", "pympler", "pytest (>=4.3.0)", "pytest-xdist", "cloudpickle", "mypy (>=0.971,<0.990)", "pytest-mypy-plugins"]
+
+[[package]]
+name = "black"
+version = "22.12.0"
+description = "The uncompromising code formatter."
+category = "dev"
+optional = false
+python-versions = ">=3.7"
+
+[package.dependencies]
+click = ">=8.0.0"
+mypy-extensions = ">=0.4.3"
+pathspec = ">=0.9.0"
+platformdirs = ">=2"
+tomli = {version = ">=1.1.0", markers = "python_full_version < \"3.11.0a7\""}
+typed-ast = {version = ">=1.4.2", markers = "python_version < \"3.8\" and implementation_name == \"cpython\""}
+typing-extensions = {version = ">=3.10.0.0", markers = "python_version < \"3.10\""}
+
+[package.extras]
+colorama = ["colorama (>=0.4.3)"]
+d = ["aiohttp (>=3.7.4)"]
+jupyter = ["ipython (>=7.8.0)", "tokenize-rt (>=3.2.0)"]
+uvloop = ["uvloop (>=0.15.2)"]
+
+[[package]]
+name = "certifi"
+version = "2022.12.7"
+description = "Python package for providing Mozilla's CA Bundle."
+category = "main"
+optional = false
+python-versions = ">=3.6"
+
+[[package]]
+name = "charset-normalizer"
+version = "2.1.1"
+description = "The Real First Universal Charset Detector. Open, modern and actively maintained alternative to Chardet."
+category = "main"
+optional = false
+python-versions = ">=3.6.0"
+
+[package.extras]
+unicode_backport = ["unicodedata2"]
+
+[[package]]
+name = "click"
+version = "8.1.3"
+description = "Composable command line interface toolkit"
+category = "dev"
+optional = false
+python-versions = ">=3.7"
+
+[package.dependencies]
+colorama = {version = "*", markers = "platform_system == \"Windows\""}
+importlib-metadata = {version = "*", markers = "python_version < \"3.8\""}
+
+[[package]]
+name = "colorama"
+version = "0.4.6"
+description = "Cross-platform colored terminal text."
+category = "dev"
+optional = false
+python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,!=3.5.*,!=3.6.*,>=2.7"
+
+[[package]]
+name = "coverage"
+version = "7.0.3"
+description = "Code coverage measurement for Python"
+category = "dev"
+optional = false
+python-versions = ">=3.7"
+
+[package.extras]
+toml = ["tomli"]
+
+[[package]]
+name = "exceptiongroup"
+version = "1.1.0"
+description = "Backport of PEP 654 (exception groups)"
+category = "dev"
+optional = false
+python-versions = ">=3.7"
+
+[package.extras]
+test = ["pytest (>=6)"]
+
+[[package]]
+name = "idna"
+version = "3.4"
+description = "Internationalized Domain Names in Applications (IDNA)"
+category = "main"
+optional = false
+python-versions = ">=3.5"
+
+[[package]]
+name = "importlib-metadata"
+version = "6.0.0"
+description = "Read metadata from Python packages"
+category = "dev"
+optional = false
+python-versions = ">=3.7"
+
+[package.dependencies]
+typing-extensions = {version = ">=3.6.4", markers = "python_version < \"3.8\""}
+zipp = ">=0.5"
+
+[package.extras]
+docs = ["sphinx (>=3.5)", "jaraco.packaging (>=9)", "rst.linker (>=1.9)", "furo", "sphinx-lint", "jaraco.tidelift (>=1.4)"]
+perf = ["ipython"]
+testing = ["pytest (>=6)", "pytest-checkdocs (>=2.4)", "flake8 (<5)", "pytest-cov", "pytest-enabler (>=1.3)", "packaging", "pyfakefs", "flufl.flake8", "pytest-perf (>=0.9.2)", "pytest-black (>=0.3.7)", "pytest-mypy (>=0.9.1)", "pytest-flake8", "importlib-resources (>=1.3)"]
+
+[[package]]
+name = "iniconfig"
+version = "1.1.1"
+description = "iniconfig: brain-dead simple config-ini parsing"
+category = "dev"
+optional = false
+python-versions = "*"
+
+[[package]]
+name = "mypy-extensions"
+version = "0.4.3"
+description = "Experimental type system extensions for programs checked with the mypy typechecker."
+category = "dev"
+optional = false
+python-versions = "*"
+
+[[package]]
+name = "oauthlib"
+version = "3.2.2"
+description = "A generic, spec-compliant, thorough implementation of the OAuth request-signing logic"
+category = "main"
+optional = false
+python-versions = ">=3.6"
+
+[package.extras]
+rsa = ["cryptography (>=3.0.0)"]
+signals = ["blinker (>=1.4.0)"]
+signedtoken = ["cryptography (>=3.0.0)", "pyjwt (>=2.0.0,<3)"]
+
+[[package]]
+name = "packaging"
+version = "22.0"
+description = "Core utilities for Python packages"
+category = "dev"
+optional = false
+python-versions = ">=3.7"
+
+[[package]]
+name = "pathspec"
+version = "0.10.3"
+description = "Utility library for gitignore style pattern matching of file paths."
+category = "dev"
+optional = false
+python-versions = ">=3.7"
+
+[[package]]
+name = "platformdirs"
+version = "2.6.2"
+description = "A small Python package for determining appropriate platform-specific dirs, e.g. a \"user data dir\"."
+category = "dev"
+optional = false
+python-versions = ">=3.7"
+
+[package.dependencies]
+typing-extensions = {version = ">=4.4", markers = "python_version < \"3.8\""}
+
+[package.extras]
+docs = ["furo (>=2022.12.7)", "proselint (>=0.13)", "sphinx-autodoc-typehints (>=1.19.5)", "sphinx (>=5.3)"]
+test = ["appdirs (==1.4.4)", "covdefaults (>=2.2.2)", "pytest-cov (>=4)", "pytest-mock (>=3.10)", "pytest (>=7.2)"]
+
+[[package]]
+name = "pluggy"
+version = "1.0.0"
+description = "plugin and hook calling mechanisms for python"
+category = "dev"
+optional = false
+python-versions = ">=3.6"
+
+[package.dependencies]
+importlib-metadata = {version = ">=0.12", markers = "python_version < \"3.8\""}
+
+[package.extras]
+dev = ["pre-commit", "tox"]
+testing = ["pytest", "pytest-benchmark"]
+
+[[package]]
+name = "pytest"
+version = "7.2.0"
+description = "pytest: simple powerful testing with Python"
+category = "dev"
+optional = false
+python-versions = ">=3.7"
+
+[package.dependencies]
+attrs = ">=19.2.0"
+colorama = {version = "*", markers = "sys_platform == \"win32\""}
+exceptiongroup = {version = ">=1.0.0rc8", markers = "python_version < \"3.11\""}
+importlib-metadata = {version = ">=0.12", markers = "python_version < \"3.8\""}
+iniconfig = "*"
+packaging = "*"
+pluggy = ">=0.12,<2.0"
+tomli = {version = ">=1.0.0", markers = "python_version < \"3.11\""}
+
+[package.extras]
+testing = ["argcomplete", "hypothesis (>=3.56)", "mock", "nose", "pygments (>=2.7.2)", "requests", "xmlschema"]
+
+[[package]]
+name = "requests"
+version = "2.28.1"
+description = "Python HTTP for Humans."
+category = "main"
+optional = false
+python-versions = ">=3.7, <4"
+
+[package.dependencies]
+certifi = ">=2017.4.17"
+charset-normalizer = ">=2,<3"
+idna = ">=2.5,<4"
+urllib3 = ">=1.21.1,<1.27"
+
+[package.extras]
+socks = ["PySocks (>=1.5.6,!=1.5.7)"]
+use_chardet_on_py3 = ["chardet (>=3.0.2,<6)"]
+
+[[package]]
+name = "requests-oauthlib"
+version = "1.3.1"
+description = "OAuthlib authentication support for Requests."
+category = "main"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+
+[package.dependencies]
+oauthlib = ">=3.0.0"
+requests = ">=2.0.0"
+
+[package.extras]
+rsa = ["oauthlib[signedtoken] (>=3.0.0)"]
+
+[[package]]
+name = "tomli"
+version = "2.0.1"
+description = "A lil' TOML parser"
+category = "dev"
+optional = false
+python-versions = ">=3.7"
+
+[[package]]
+name = "typed-ast"
+version = "1.5.4"
+description = "a fork of Python 2 and 3 ast modules with type comment support"
+category = "dev"
+optional = false
+python-versions = ">=3.6"
+
+[[package]]
+name = "typing-extensions"
+version = "4.4.0"
+description = "Backported and Experimental Type Hints for Python 3.7+"
+category = "dev"
+optional = false
+python-versions = ">=3.7"
+
+[[package]]
+name = "urllib3"
+version = "1.26.13"
+description = "HTTP library with thread-safe connection pooling, file post, and more."
+category = "main"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, !=3.5.*"
+
+[package.extras]
+brotli = ["brotlicffi (>=0.8.0)", "brotli (>=1.0.9)", "brotlipy (>=0.6.0)"]
+secure = ["pyOpenSSL (>=0.14)", "cryptography (>=1.3.4)", "idna (>=2.0.0)", "certifi", "urllib3-secure-extra", "ipaddress"]
+socks = ["PySocks (>=1.5.6,!=1.5.7,<2.0)"]
+
+[[package]]
+name = "zipp"
+version = "3.11.0"
+description = "Backport of pathlib-compatible object wrapper for zip files"
+category = "dev"
+optional = false
+python-versions = ">=3.7"
+
+[package.extras]
+docs = ["sphinx (>=3.5)", "jaraco.packaging (>=9)", "rst.linker (>=1.9)", "furo", "jaraco.tidelift (>=1.4)"]
+testing = ["pytest (>=6)", "pytest-checkdocs (>=2.4)", "flake8 (<5)", "pytest-cov", "pytest-enabler (>=1.3)", "jaraco.itertools", "func-timeout", "jaraco.functools", "more-itertools", "pytest-black (>=0.3.7)", "pytest-mypy (>=0.9.1)", "pytest-flake8"]
+
+[metadata]
+lock-version = "1.1"
+python-versions = "^3.7"
+content-hash = "8282ca25e16eb31528101bb6df8e8d85b294ca95ee436c4f5823db107ad14d49"
+
+[metadata.files]
+attrs = []
+black = []
+certifi = []
+charset-normalizer = []
+click = [
+    {file = "click-8.1.3-py3-none-any.whl", hash = "sha256:bb4d8133cb15a609f44e8213d9b391b0809795062913b383c62be0ee95b1db48"},
+    {file = "click-8.1.3.tar.gz", hash = "sha256:7682dc8afb30297001674575ea00d1814d808d6a36af415a82bd481d37ba7b8e"},
+]
+colorama = []
+coverage = []
+exceptiongroup = []
+idna = []
+importlib-metadata = []
+iniconfig = []
+mypy-extensions = []
+oauthlib = []
+packaging = []
+pathspec = []
+platformdirs = []
+pluggy = []
+pytest = []
+requests = []
+requests-oauthlib = []
+tomli = []
+typed-ast = []
+typing-extensions = []
+urllib3 = []
+zipp = []
diff --git a/pyproject.toml b/pyproject.toml
index a12434c..f72a972 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,7 +1,27 @@
-[build-system]
-requires = ["setuptools>=46.1.0", "setuptools_scm[toml]>=5", "wheel"]
-build-backend = "setuptools.build_meta"
+[tool.poetry]
+name = "greenmountainpower"
+version = "0.0.4"
+description = "This is an unofficial Python client that uses the undocumented API for Green Mountain Power accounts."
+authors = ["Kodey Converse <kodey@conve.rs>", "Stan Brinkerhoff <stan@vtwireless.com>"]
+readme = "README.md"
+license = "MIT"
+homepage = "https://github.com/sbrinkerhoff/greenmountainpower/"
+include = [
+    "LICENSE",
+]
+
+[tool.poetry.dependencies]
+python = "^3.7"
+requests = "^2"
+requests-oauthlib = "^1"
+oauthlib = "^3"
+
+[tool.poetry.dev-dependencies]
+coverage = "^7.0.2"
+black = "^22"
+pytest = "^7.2.0"
 
-[tool.setuptools_scm]
-# See configuration details in https://github.com/pypa/setuptools_scm
-version_scheme = "no-guess-dev"
+
+[build-system]
+requires = ["poetry-core>=1.0.0"]
+build-backend = "poetry.core.masonry.api"
diff --git a/setup.cfg b/setup.cfg
deleted file mode 100644
index 48e5503..0000000
--- a/setup.cfg
+++ /dev/null
@@ -1,102 +0,0 @@
-# This file is used to configure your project.
-# Read more about the various options under:
-# https://setuptools.pypa.io/en/latest/userguide/declarative_config.html
-# https://setuptools.pypa.io/en/latest/references/keywords.html
-
-[metadata]
-name = greenmountainpower
-description = An unofficial client for the Green Mountain Power APIs
-author = Kodey Converse
-author_email = kodey@conve.rs
-license = MIT
-license_files = LICENSE
-long_description = file: README.md
-long_description_content_type = text/markdown; charset=UTF-8
-url = https://github.com/krconv/greenmountainpower/
-project_urls =
-    Tracker = https://github.com/krconv/greenmountainpower/issues
-
-# Change if running only on Windows, Mac or Linux (comma-separated)
-platforms = any
-
-[options]
-zip_safe = False
-packages = find_namespace:
-include_package_data = True
-package_dir =
-    =src
-
-# Require a min/specific Python version (comma-separated conditions)
-python_requires = >=3.6
-
-# Add here dependencies of your project (line-separated), e.g. requests>=2.2,<3.0.
-# Version specifiers like >=2.2,<3.0 avoid problems due to API changes in
-# new major versions. This works if the required packages follow Semantic Versioning.
-# For more information, check out https://semver.org/.
-install_requires =
-    oauthlib >=3.0,<4.0
-    requests >=2.0,<3.0
-    requests_oauthlib >=1.0,<2.0
-
-
-[options.packages.find]
-where = src
-exclude =
-    tests
-
-[options.extras_require]
-# Add here additional requirements for extra features, to install with:
-# `pip install greenmountainpower[PDF]` like:
-# PDF = ReportLab; RXP
-
-# Add here test requirements (semicolon/line-separated)
-# testing =
-#     setuptools
-#     pytest
-#     pytest-cov
-
-[options.entry_points]
-# Add here console scripts like:
-# console_scripts =
-#     script_name = greenmountainpower.module:function
-# For example:
-# console_scripts =
-#     fibonacci = greenmountainpower.skeleton:run
-# And any other entry points, for example:
-
-[tool:pytest]
-# Specify command line options as you would do when invoking pytest directly.
-# e.g. --cov-report html (or xml) for html/xml output or --junitxml junit.xml
-# in order to write a coverage file that can be read by Jenkins.
-# CAUTION: --cov flags may prohibit setting breakpoints while debugging.
-#          Comment those flags to avoid this pytest issue.
-# addopts =
-#     --verbose
-# norecursedirs =
-#     dist
-#     build
-#     .tox
-# testpaths = tests
-# Use pytest markers to select/deselect specific tests
-# markers =
-#     slow: mark tests as slow (deselect with '-m "not slow"')
-#     system: mark end-to-end system tests
-
-[devpi:upload]
-# Options for the devpi: PyPI server and packaging tool
-# VCS export must be deactivated since we are using setuptools-scm
-no_vcs = 1
-formats = bdist_wheel
-
-[flake8]
-# Some sane defaults for the code style checker flake8
-max_line_length = 88
-extend_ignore = E203, W503
-# ^  Black-compatible
-#    E203 and W503 have edge cases handled by black
-exclude =
-    .tox
-    build
-    dist
-    .eggs
-    docs/conf.py
diff --git a/setup.py b/setup.py
deleted file mode 100644
index bb39946..0000000
--- a/setup.py
+++ /dev/null
@@ -1,17 +0,0 @@
-"""
-    Setup file for greenmountainpower.
-    Use setup.cfg to configure your project.
-"""
-from setuptools import setup
-
-if __name__ == "__main__":
-    try:
-        setup(use_scm_version={"version_scheme": "no-guess-dev"})
-    except:  # noqa
-        print(
-            "\n\nAn error occurred while building the project, "
-            "please ensure you have the most updated version of setuptools, "
-            "setuptools_scm and wheel with:\n"
-            "   pip install -U setuptools setuptools_scm wheel\n\n"
-        )
-        raise
diff --git a/tests/test_api.py b/tests/test_api.py
new file mode 100644
index 0000000..b0573eb
--- /dev/null
+++ b/tests/test_api.py
@@ -0,0 +1,21 @@
+from greenmountainpower.api import Usage, GreenMountainPowerApi
+from unittest.mock import patch
+import datetime
+
+
+def test_try_parse_data():
+    data = {"date": "2022-01-01T00:00:00Z", "consumed": 10.5}
+    result = list(Usage.try_parse_data(data))
+    assert len(result) == 1
+    assert isinstance(result[0], Usage)
+    assert result[0].start_time == datetime.datetime(2022, 1, 1, 0, 0, 0)
+    assert result[0].consumed_kwh == 10.5
+
+
+@patch("greenmountainpower.api.requests_oauthlib.OAuth2Session")
+def test_instantiate_client(mock_oauth2_session):
+    account_number = 12345
+    username = "test"
+    password = "test"
+    g = GreenMountainPowerApi(account_number, username, password)
+    assert g.account_number == account_number