diff --git a/homeassistant/components/sensor/startca.py b/homeassistant/components/sensor/startca.py
new file mode 100644
index 00000000000..a5908812b6c
--- /dev/null
+++ b/homeassistant/components/sensor/startca.py
@@ -0,0 +1,186 @@
+"""
+Support for Start.ca Bandwidth Monitor.
+
+For more details about this platform, please refer to the documentation at
+https://home-assistant.io/components/sensor.startca/
+"""
+from datetime import timedelta
+from xml.parsers.expat import ExpatError
+import logging
+import asyncio
+import async_timeout
+
+import voluptuous as vol
+
+from homeassistant.components.sensor import PLATFORM_SCHEMA
+from homeassistant.const import (
+    CONF_API_KEY, CONF_MONITORED_VARIABLES, CONF_NAME)
+from homeassistant.helpers.aiohttp_client import async_get_clientsession
+import homeassistant.helpers.config_validation as cv
+from homeassistant.helpers.entity import Entity
+from homeassistant.util import Throttle
+
+REQUIREMENTS = ['xmltodict==0.11.0']
+
+_LOGGER = logging.getLogger(__name__)
+
+DEFAULT_NAME = 'Start.ca'
+CONF_TOTAL_BANDWIDTH = 'total_bandwidth'
+
+GIGABYTES = 'GB'  # type: str
+PERCENT = '%'  # type: str
+
+MIN_TIME_BETWEEN_UPDATES = timedelta(hours=1)
+REQUEST_TIMEOUT = 5  # seconds
+
+SENSOR_TYPES = {
+    'usage': ['Usage Ratio', PERCENT, 'mdi:percent'],
+    'usage_gb': ['Usage', GIGABYTES, 'mdi:download'],
+    'limit': ['Data limit', GIGABYTES, 'mdi:download'],
+    'used_download': ['Used Download', GIGABYTES, 'mdi:download'],
+    'used_upload': ['Used Upload', GIGABYTES, 'mdi:upload'],
+    'used_total': ['Used Total', GIGABYTES, 'mdi:download'],
+    'grace_download': ['Grace Download', GIGABYTES, 'mdi:download'],
+    'grace_upload': ['Grace Upload', GIGABYTES, 'mdi:upload'],
+    'grace_total': ['Grace Total', GIGABYTES, 'mdi:download'],
+    'total_download': ['Total Download', GIGABYTES, 'mdi:download'],
+    'total_upload': ['Total Upload', GIGABYTES, 'mdi:download'],
+    'used_remaining': ['Remaining', GIGABYTES, 'mdi:download']
+}
+
+PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend({
+    vol.Required(CONF_MONITORED_VARIABLES):
+        vol.All(cv.ensure_list, [vol.In(SENSOR_TYPES)]),
+    vol.Required(CONF_API_KEY): cv.string,
+    vol.Required(CONF_TOTAL_BANDWIDTH): cv.positive_int,
+    vol.Optional(CONF_NAME, default=DEFAULT_NAME): cv.string,
+})
+
+
+@asyncio.coroutine
+def async_setup_platform(hass, config, async_add_devices, discovery_info=None):
+    """Set up the sensor platform."""
+    websession = async_get_clientsession(hass)
+    apikey = config.get(CONF_API_KEY)
+    bandwidthcap = config.get(CONF_TOTAL_BANDWIDTH)
+
+    ts_data = StartcaData(hass.loop, websession, apikey, bandwidthcap)
+    ret = yield from ts_data.async_update()
+    if ret is False:
+        _LOGGER.error("Invalid Start.ca API key: %s", apikey)
+        return
+
+    name = config.get(CONF_NAME)
+    sensors = []
+    for variable in config[CONF_MONITORED_VARIABLES]:
+        sensors.append(StartcaSensor(ts_data, variable, name))
+    async_add_devices(sensors, True)
+
+
+class StartcaSensor(Entity):
+    """Representation of Start.ca Bandwidth sensor."""
+
+    def __init__(self, startcadata, sensor_type, name):
+        """Initialize the sensor."""
+        self.client_name = name
+        self.type = sensor_type
+        self._name = SENSOR_TYPES[sensor_type][0]
+        self._unit_of_measurement = SENSOR_TYPES[sensor_type][1]
+        self._icon = SENSOR_TYPES[sensor_type][2]
+        self.startcadata = startcadata
+        self._state = None
+
+    @property
+    def name(self):
+        """Return the name of the sensor."""
+        return '{} {}'.format(self.client_name, self._name)
+
+    @property
+    def state(self):
+        """Return the state of the sensor."""
+        return self._state
+
+    @property
+    def unit_of_measurement(self):
+        """Return the unit of measurement of this entity, if any."""
+        return self._unit_of_measurement
+
+    @property
+    def icon(self):
+        """Icon to use in the frontend, if any."""
+        return self._icon
+
+    @asyncio.coroutine
+    def async_update(self):
+        """Get the latest data from Start.ca and update the state."""
+        yield from self.startcadata.async_update()
+        if self.type in self.startcadata.data:
+            self._state = round(self.startcadata.data[self.type], 2)
+
+
+class StartcaData(object):
+    """Get data from Start.ca API."""
+
+    def __init__(self, loop, websession, api_key, bandwidth_cap):
+        """Initialize the data object."""
+        self.loop = loop
+        self.websession = websession
+        self.api_key = api_key
+        self.bandwidth_cap = bandwidth_cap
+        # Set unlimited users to infinite, otherwise the cap.
+        self.data = {"limit": self.bandwidth_cap} if self.bandwidth_cap > 0 \
+            else {"limit": float('inf')}
+
+    @staticmethod
+    def bytes_to_gb(value):
+        """Convert from bytes to GB.
+
+        :param value: The value in bytes to convert to GB.
+        :return: Converted GB value
+        """
+        return float(value) * 10 ** -9
+
+    @asyncio.coroutine
+    @Throttle(MIN_TIME_BETWEEN_UPDATES)
+    def async_update(self):
+        """Get the Start.ca bandwidth data from the web service."""
+        import xmltodict
+        _LOGGER.debug("Updating Start.ca usage data")
+        url = 'https://www.start.ca/support/usage/api?key=' + \
+              self.api_key
+        with async_timeout.timeout(REQUEST_TIMEOUT, loop=self.loop):
+            req = yield from self.websession.get(url)
+        if req.status != 200:
+            _LOGGER.error("Request failed with status: %u", req.status)
+            return False
+
+        data = yield from req.text()
+        try:
+            xml_data = xmltodict.parse(data)
+        except ExpatError:
+            return False
+
+        used_dl = self.bytes_to_gb(xml_data['usage']['used']['download'])
+        used_ul = self.bytes_to_gb(xml_data['usage']['used']['upload'])
+        grace_dl = self.bytes_to_gb(xml_data['usage']['grace']['download'])
+        grace_ul = self.bytes_to_gb(xml_data['usage']['grace']['upload'])
+        total_dl = self.bytes_to_gb(xml_data['usage']['total']['download'])
+        total_ul = self.bytes_to_gb(xml_data['usage']['total']['upload'])
+
+        limit = self.data['limit']
+        if self.bandwidth_cap > 0:
+            self.data['usage'] = 100*used_dl/self.bandwidth_cap
+        else:
+            self.data['usage'] = 0
+        self.data['usage_gb'] = used_dl
+        self.data['used_download'] = used_dl
+        self.data['used_upload'] = used_ul
+        self.data['used_total'] = used_dl + used_ul
+        self.data['grace_download'] = grace_dl
+        self.data['grace_upload'] = grace_ul
+        self.data['grace_total'] = grace_dl + grace_ul
+        self.data['total_download'] = total_dl
+        self.data['total_upload'] = total_ul
+        self.data['used_remaining'] = limit - used_dl
+
+        return True
diff --git a/requirements_all.txt b/requirements_all.txt
index 82c98817aff..d1b3daeaf00 100644
--- a/requirements_all.txt
+++ b/requirements_all.txt
@@ -1242,6 +1242,7 @@ xboxapi==0.1.1
 xknx==0.7.18
 
 # homeassistant.components.media_player.bluesound
+# homeassistant.components.sensor.startca
 # homeassistant.components.sensor.swiss_hydrological_data
 # homeassistant.components.sensor.ted5000
 # homeassistant.components.sensor.yr
diff --git a/tests/components/sensor/test_startca.py b/tests/components/sensor/test_startca.py
new file mode 100644
index 00000000000..95da1c93a0c
--- /dev/null
+++ b/tests/components/sensor/test_startca.py
@@ -0,0 +1,215 @@
+"""Tests for the Start.ca sensor platform."""
+import asyncio
+from homeassistant.bootstrap import async_setup_component
+from homeassistant.components.sensor.startca import StartcaData
+from homeassistant.helpers.aiohttp_client import async_get_clientsession
+
+
+@asyncio.coroutine
+def test_capped_setup(hass, aioclient_mock):
+    """Test the default setup."""
+    config = {'platform': 'startca',
+              'api_key': 'NOTAKEY',
+              'total_bandwidth': 400,
+              'monitored_variables': [
+                  'usage',
+                  'usage_gb',
+                  'limit',
+                  'used_download',
+                  'used_upload',
+                  'used_total',
+                  'grace_download',
+                  'grace_upload',
+                  'grace_total',
+                  'total_download',
+                  'total_upload',
+                  'used_remaining']}
+
+    result = '<?xml version="1.0" encoding="ISO-8859-15"?>'\
+             '<usage>'\
+             '<version>1.1</version>'\
+             '<total> <!-- total actual usage -->'\
+             '<download>304946829777</download>'\
+             '<upload>6480700153</upload>'\
+             '</total>'\
+             '<used> <!-- part of usage that counts against quota -->'\
+             '<download>304946829777</download>'\
+             '<upload>6480700153</upload>'\
+             '</used>'\
+             '<grace> <!-- part of usage that is free -->'\
+             '<download>304946829777</download>'\
+             '<upload>6480700153</upload>'\
+             '</grace>'\
+             '</usage>'
+    aioclient_mock.get('https://www.start.ca/support/usage/api?key='
+                       'NOTAKEY',
+                       text=result)
+
+    yield from async_setup_component(hass, 'sensor', {'sensor': config})
+
+    state = hass.states.get('sensor.startca_usage_ratio')
+    assert state.attributes.get('unit_of_measurement') == '%'
+    assert state.state == '76.24'
+
+    state = hass.states.get('sensor.startca_usage')
+    assert state.attributes.get('unit_of_measurement') == 'GB'
+    assert state.state == '304.95'
+
+    state = hass.states.get('sensor.startca_data_limit')
+    assert state.attributes.get('unit_of_measurement') == 'GB'
+    assert state.state == '400'
+
+    state = hass.states.get('sensor.startca_used_download')
+    assert state.attributes.get('unit_of_measurement') == 'GB'
+    assert state.state == '304.95'
+
+    state = hass.states.get('sensor.startca_used_upload')
+    assert state.attributes.get('unit_of_measurement') == 'GB'
+    assert state.state == '6.48'
+
+    state = hass.states.get('sensor.startca_used_total')
+    assert state.attributes.get('unit_of_measurement') == 'GB'
+    assert state.state == '311.43'
+
+    state = hass.states.get('sensor.startca_grace_download')
+    assert state.attributes.get('unit_of_measurement') == 'GB'
+    assert state.state == '304.95'
+
+    state = hass.states.get('sensor.startca_grace_upload')
+    assert state.attributes.get('unit_of_measurement') == 'GB'
+    assert state.state == '6.48'
+
+    state = hass.states.get('sensor.startca_grace_total')
+    assert state.attributes.get('unit_of_measurement') == 'GB'
+    assert state.state == '311.43'
+
+    state = hass.states.get('sensor.startca_total_download')
+    assert state.attributes.get('unit_of_measurement') == 'GB'
+    assert state.state == '304.95'
+
+    state = hass.states.get('sensor.startca_total_upload')
+    assert state.attributes.get('unit_of_measurement') == 'GB'
+    assert state.state == '6.48'
+
+    state = hass.states.get('sensor.startca_remaining')
+    assert state.attributes.get('unit_of_measurement') == 'GB'
+    assert state.state == '95.05'
+
+
+@asyncio.coroutine
+def test_unlimited_setup(hass, aioclient_mock):
+    """Test the default setup."""
+    config = {'platform': 'startca',
+              'api_key': 'NOTAKEY',
+              'total_bandwidth': 0,
+              'monitored_variables': [
+                  'usage',
+                  'usage_gb',
+                  'limit',
+                  'used_download',
+                  'used_upload',
+                  'used_total',
+                  'grace_download',
+                  'grace_upload',
+                  'grace_total',
+                  'total_download',
+                  'total_upload',
+                  'used_remaining']}
+
+    result = '<?xml version="1.0" encoding="ISO-8859-15"?>'\
+             '<usage>'\
+             '<version>1.1</version>'\
+             '<total> <!-- total actual usage -->'\
+             '<download>304946829777</download>'\
+             '<upload>6480700153</upload>'\
+             '</total>'\
+             '<used> <!-- part of usage that counts against quota -->'\
+             '<download>0</download>'\
+             '<upload>0</upload>'\
+             '</used>'\
+             '<grace> <!-- part of usage that is free -->'\
+             '<download>304946829777</download>'\
+             '<upload>6480700153</upload>'\
+             '</grace>'\
+             '</usage>'
+    aioclient_mock.get('https://www.start.ca/support/usage/api?key='
+                       'NOTAKEY',
+                       text=result)
+
+    yield from async_setup_component(hass, 'sensor', {'sensor': config})
+
+    state = hass.states.get('sensor.startca_usage_ratio')
+    assert state.attributes.get('unit_of_measurement') == '%'
+    assert state.state == '0'
+
+    state = hass.states.get('sensor.startca_usage')
+    assert state.attributes.get('unit_of_measurement') == 'GB'
+    assert state.state == '0.0'
+
+    state = hass.states.get('sensor.startca_data_limit')
+    assert state.attributes.get('unit_of_measurement') == 'GB'
+    assert state.state == 'inf'
+
+    state = hass.states.get('sensor.startca_used_download')
+    assert state.attributes.get('unit_of_measurement') == 'GB'
+    assert state.state == '0.0'
+
+    state = hass.states.get('sensor.startca_used_upload')
+    assert state.attributes.get('unit_of_measurement') == 'GB'
+    assert state.state == '0.0'
+
+    state = hass.states.get('sensor.startca_used_total')
+    assert state.attributes.get('unit_of_measurement') == 'GB'
+    assert state.state == '0.0'
+
+    state = hass.states.get('sensor.startca_grace_download')
+    assert state.attributes.get('unit_of_measurement') == 'GB'
+    assert state.state == '304.95'
+
+    state = hass.states.get('sensor.startca_grace_upload')
+    assert state.attributes.get('unit_of_measurement') == 'GB'
+    assert state.state == '6.48'
+
+    state = hass.states.get('sensor.startca_grace_total')
+    assert state.attributes.get('unit_of_measurement') == 'GB'
+    assert state.state == '311.43'
+
+    state = hass.states.get('sensor.startca_total_download')
+    assert state.attributes.get('unit_of_measurement') == 'GB'
+    assert state.state == '304.95'
+
+    state = hass.states.get('sensor.startca_total_upload')
+    assert state.attributes.get('unit_of_measurement') == 'GB'
+    assert state.state == '6.48'
+
+    state = hass.states.get('sensor.startca_remaining')
+    assert state.attributes.get('unit_of_measurement') == 'GB'
+    assert state.state == 'inf'
+
+
+@asyncio.coroutine
+def test_bad_return_code(hass, aioclient_mock):
+    """Test handling a return code that isn't HTTP OK."""
+    aioclient_mock.get('https://www.start.ca/support/usage/api?key='
+                       'NOTAKEY',
+                       status=404)
+
+    scd = StartcaData(hass.loop, async_get_clientsession(hass),
+                      'NOTAKEY', 400)
+
+    result = yield from scd.async_update()
+    assert result is False
+
+
+@asyncio.coroutine
+def test_bad_json_decode(hass, aioclient_mock):
+    """Test decoding invalid json result."""
+    aioclient_mock.get('https://www.start.ca/support/usage/api?key='
+                       'NOTAKEY',
+                       text='this is not xml')
+
+    scd = StartcaData(hass.loop, async_get_clientsession(hass),
+                      'NOTAKEY', 400)
+
+    result = yield from scd.async_update()
+    assert result is False