diff --git a/homeassistant/components/energy/websocket_api.py b/homeassistant/components/energy/websocket_api.py
index 2075d000033..15ffc6a2804 100644
--- a/homeassistant/components/energy/websocket_api.py
+++ b/homeassistant/components/energy/websocket_api.py
@@ -13,6 +13,7 @@ from typing import Any, cast
 import voluptuous as vol
 
 from homeassistant.components import recorder, websocket_api
+from homeassistant.components.recorder.statistics import StatisticsRow
 from homeassistant.const import UnitOfEnergy
 from homeassistant.core import HomeAssistant, callback
 from homeassistant.helpers.integration_platform import (
@@ -277,7 +278,7 @@ async def ws_get_fossil_energy_consumption(
     )
 
     def _combine_sum_statistics(
-        stats: dict[str, list[dict[str, Any]]], statistic_ids: list[str]
+        stats: dict[str, list[StatisticsRow]], statistic_ids: list[str]
     ) -> dict[float, float]:
         """Combine multiple statistics, returns a dict indexed by start time."""
         result: defaultdict[float, float] = defaultdict(float)
@@ -313,11 +314,10 @@ async def ws_get_fossil_energy_consumption(
         if not stat_list:
             return result
         prev_stat: dict[str, Any] = stat_list[0]
+        fake_stat = {"start": stat_list[-1]["start"] + period.total_seconds()}
 
         # Loop over the hourly deltas + a fake entry to end the period
-        for statistic in chain(
-            stat_list, ({"start": stat_list[-1]["start"] + period.total_seconds()},)
-        ):
+        for statistic in chain(stat_list, (fake_stat,)):
             if not same_period(prev_stat["start"], statistic["start"]):
                 start, _ = period_start_end(prev_stat["start"])
                 # The previous statistic was the last entry of the period
@@ -338,10 +338,13 @@ async def ws_get_fossil_energy_consumption(
         statistics, msg["energy_statistic_ids"]
     )
     energy_deltas = _calculate_deltas(merged_energy_statistics)
-    indexed_co2_statistics = {
-        period["start"]: period["mean"]
-        for period in statistics.get(msg["co2_statistic_id"], {})
-    }
+    indexed_co2_statistics = cast(
+        dict[float, float],
+        {
+            period["start"]: period["mean"]
+            for period in statistics.get(msg["co2_statistic_id"], {})
+        },
+    )
 
     # Calculate amount of fossil based energy, assume 100% fossil if missing
     fossil_energy = [
diff --git a/homeassistant/components/recorder/statistics.py b/homeassistant/components/recorder/statistics.py
index 473d416d757..645b7d4f042 100644
--- a/homeassistant/components/recorder/statistics.py
+++ b/homeassistant/components/recorder/statistics.py
@@ -14,7 +14,7 @@ from operator import itemgetter
 import os
 import re
 from statistics import mean
-from typing import TYPE_CHECKING, Any, Literal, cast
+from typing import TYPE_CHECKING, Any, Literal, TypedDict, cast
 
 from sqlalchemy import Select, and_, bindparam, func, lambda_stmt, select, text
 from sqlalchemy.engine import Engine
@@ -166,6 +166,24 @@ STATISTIC_UNIT_TO_UNIT_CONVERTER: dict[str | None, type[BaseUnitConverter]] = {
 _LOGGER = logging.getLogger(__name__)
 
 
+class BaseStatisticsRow(TypedDict, total=False):
+    """A processed row of statistic data."""
+
+    start: float
+
+
+class StatisticsRow(BaseStatisticsRow, total=False):
+    """A processed row of statistic data."""
+
+    end: float
+    last_reset: float | None
+    state: float | None
+    sum: float | None
+    min: float | None
+    max: float | None
+    mean: float | None
+
+
 def _get_unit_class(unit: str | None) -> str | None:
     """Get corresponding unit class from from the statistics unit."""
     if converter := STATISTIC_UNIT_TO_UNIT_CONVERTER.get(unit):
@@ -1048,14 +1066,14 @@ def list_statistic_ids(
 
 
 def _reduce_statistics(
-    stats: dict[str, list[dict[str, Any]]],
+    stats: dict[str, list[StatisticsRow]],
     same_period: Callable[[float, float], bool],
     period_start_end: Callable[[float], tuple[float, float]],
     period: timedelta,
     types: set[Literal["last_reset", "max", "mean", "min", "state", "sum"]],
-) -> dict[str, list[dict[str, Any]]]:
+) -> dict[str, list[StatisticsRow]]:
     """Reduce hourly statistics to daily or monthly statistics."""
-    result: dict[str, list[dict[str, Any]]] = defaultdict(list)
+    result: dict[str, list[StatisticsRow]] = defaultdict(list)
     period_seconds = period.total_seconds()
     _want_mean = "mean" in types
     _want_min = "min" in types
@@ -1067,16 +1085,15 @@ def _reduce_statistics(
         max_values: list[float] = []
         mean_values: list[float] = []
         min_values: list[float] = []
-        prev_stat: dict[str, Any] = stat_list[0]
+        prev_stat: StatisticsRow = stat_list[0]
+        fake_entry: StatisticsRow = {"start": stat_list[-1]["start"] + period_seconds}
 
         # Loop over the hourly statistics + a fake entry to end the period
-        for statistic in chain(
-            stat_list, ({"start": stat_list[-1]["start"] + period_seconds},)
-        ):
+        for statistic in chain(stat_list, (fake_entry,)):
             if not same_period(prev_stat["start"], statistic["start"]):
                 start, end = period_start_end(prev_stat["start"])
                 # The previous statistic was the last entry of the period
-                row: dict[str, Any] = {
+                row: StatisticsRow = {
                     "start": start,
                     "end": end,
                 }
@@ -1146,9 +1163,9 @@ def reduce_day_ts_factory() -> (
 
 
 def _reduce_statistics_per_day(
-    stats: dict[str, list[dict[str, Any]]],
+    stats: dict[str, list[StatisticsRow]],
     types: set[Literal["last_reset", "max", "mean", "min", "state", "sum"]],
-) -> dict[str, list[dict[str, Any]]]:
+) -> dict[str, list[StatisticsRow]]:
     """Reduce hourly statistics to daily statistics."""
     _same_day_ts, _day_start_end_ts = reduce_day_ts_factory()
     return _reduce_statistics(
@@ -1196,9 +1213,9 @@ def reduce_week_ts_factory() -> (
 
 
 def _reduce_statistics_per_week(
-    stats: dict[str, list[dict[str, Any]]],
+    stats: dict[str, list[StatisticsRow]],
     types: set[Literal["last_reset", "max", "mean", "min", "state", "sum"]],
-) -> dict[str, list[dict[str, Any]]]:
+) -> dict[str, list[StatisticsRow]]:
     """Reduce hourly statistics to weekly statistics."""
     _same_week_ts, _week_start_end_ts = reduce_week_ts_factory()
     return _reduce_statistics(
@@ -1248,9 +1265,9 @@ def reduce_month_ts_factory() -> (
 
 
 def _reduce_statistics_per_month(
-    stats: dict[str, list[dict[str, Any]]],
+    stats: dict[str, list[StatisticsRow]],
     types: set[Literal["last_reset", "max", "mean", "min", "state", "sum"]],
-) -> dict[str, list[dict[str, Any]]]:
+) -> dict[str, list[StatisticsRow]]:
     """Reduce hourly statistics to monthly statistics."""
     _same_month_ts, _month_start_end_ts = reduce_month_ts_factory()
     return _reduce_statistics(
@@ -1724,7 +1741,7 @@ def _statistics_during_period_with_session(
     period: Literal["5minute", "day", "hour", "week", "month"],
     units: dict[str, str] | None,
     types: set[Literal["last_reset", "max", "mean", "min", "state", "sum"]],
-) -> dict[str, list[dict[str, Any]]]:
+) -> dict[str, list[StatisticsRow]]:
     """Return statistic data points during UTC period start_time - end_time.
 
     If end_time is omitted, returns statistics newer than or equal to start_time.
@@ -1808,7 +1825,7 @@ def statistics_during_period(
     period: Literal["5minute", "day", "hour", "week", "month"],
     units: dict[str, str] | None,
     types: set[Literal["last_reset", "max", "mean", "min", "state", "sum"]],
-) -> dict[str, list[dict[str, Any]]]:
+) -> dict[str, list[StatisticsRow]]:
     """Return statistic data points during UTC period start_time - end_time.
 
     If end_time is omitted, returns statistics newer than or equal to start_time.
@@ -1863,7 +1880,7 @@ def _get_last_statistics(
     convert_units: bool,
     table: type[StatisticsBase],
     types: set[Literal["last_reset", "max", "mean", "min", "state", "sum"]],
-) -> dict[str, list[dict]]:
+) -> dict[str, list[StatisticsRow]]:
     """Return the last number_of_stats statistics for a given statistic_id."""
     statistic_ids = [statistic_id]
     with session_scope(hass=hass, read_only=True) as session:
@@ -1902,7 +1919,7 @@ def get_last_statistics(
     statistic_id: str,
     convert_units: bool,
     types: set[Literal["last_reset", "max", "mean", "min", "state", "sum"]],
-) -> dict[str, list[dict]]:
+) -> dict[str, list[StatisticsRow]]:
     """Return the last number_of_stats statistics for a statistic_id."""
     return _get_last_statistics(
         hass, number_of_stats, statistic_id, convert_units, Statistics, types
@@ -1915,7 +1932,7 @@ def get_last_short_term_statistics(
     statistic_id: str,
     convert_units: bool,
     types: set[Literal["last_reset", "max", "mean", "min", "state", "sum"]],
-) -> dict[str, list[dict]]:
+) -> dict[str, list[StatisticsRow]]:
     """Return the last number_of_stats short term statistics for a statistic_id."""
     return _get_last_statistics(
         hass, number_of_stats, statistic_id, convert_units, StatisticsShortTerm, types
@@ -1951,7 +1968,7 @@ def get_latest_short_term_statistics(
     statistic_ids: list[str],
     types: set[Literal["last_reset", "max", "mean", "min", "state", "sum"]],
     metadata: dict[str, tuple[int, StatisticMetaData]] | None = None,
-) -> dict[str, list[dict]]:
+) -> dict[str, list[StatisticsRow]]:
     """Return the latest short term statistics for a list of statistic_ids."""
     with session_scope(hass=hass, read_only=True) as session:
         # Fetch metadata for the given statistic_ids
@@ -2054,10 +2071,10 @@ def _sorted_statistics_to_dict(
     start_time: datetime | None,
     units: dict[str, str] | None,
     types: set[Literal["last_reset", "max", "mean", "min", "state", "sum"]],
-) -> dict[str, list[dict]]:
+) -> dict[str, list[StatisticsRow]]:
     """Convert SQL results into JSON friendly data structure."""
     assert stats, "stats must not be empty"  # Guard against implementation error
-    result: dict = defaultdict(list)
+    result: dict[str, list[StatisticsRow]] = defaultdict(list)
     metadata = dict(_metadata.values())
     need_stat_at_start_time: set[int] = set()
     start_time_ts = start_time.timestamp() if start_time else None
@@ -2123,7 +2140,7 @@ def _sorted_statistics_to_dict(
         # attribute lookups, and dict lookups as much as possible.
         #
         for db_state in stats_list:
-            row: dict[str, Any] = {
+            row: StatisticsRow = {
                 "start": (start_ts := db_state[start_ts_idx]),
                 "end": start_ts + table_duration_seconds,
             }
diff --git a/homeassistant/components/sensor/recorder.py b/homeassistant/components/sensor/recorder.py
index 0d2dc06b83f..bd4facbea17 100644
--- a/homeassistant/components/sensor/recorder.py
+++ b/homeassistant/components/sensor/recorder.py
@@ -529,11 +529,11 @@ def _compile_statistics(  # noqa: C901
             if entity_id in last_stats:
                 # We have compiled history for this sensor before,
                 # use that as a starting point.
-                last_reset = old_last_reset = _timestamp_to_isoformat_or_none(
-                    last_stats[entity_id][0]["last_reset"]
-                )
-                new_state = old_state = last_stats[entity_id][0]["state"]
-                _sum = last_stats[entity_id][0]["sum"] or 0.0
+                last_stat = last_stats[entity_id][0]
+                last_reset = _timestamp_to_isoformat_or_none(last_stat["last_reset"])
+                old_last_reset = last_reset
+                new_state = old_state = last_stat["state"]
+                _sum = last_stat["sum"] or 0.0
 
             for fstate, state in fstates:
                 reset = False
@@ -596,7 +596,7 @@ def _compile_statistics(  # noqa: C901
 
                 if reset:
                     # The sensor has been reset, update the sum
-                    if old_state is not None:
+                    if old_state is not None and new_state is not None:
                         _sum += new_state - old_state
                     # ..and update the starting point
                     new_state = fstate
diff --git a/homeassistant/components/tibber/sensor.py b/homeassistant/components/tibber/sensor.py
index 7c563208720..4d847c19205 100644
--- a/homeassistant/components/tibber/sensor.py
+++ b/homeassistant/components/tibber/sensor.py
@@ -6,7 +6,7 @@ import datetime
 from datetime import timedelta
 import logging
 from random import randrange
-from typing import Any
+from typing import Any, cast
 
 import aiohttp
 import tibber
@@ -614,7 +614,7 @@ class TibberDataCoordinator(DataUpdateCoordinator[None]):
                         5 * 365 * 24, production=is_production
                     )
 
-                    _sum = 0
+                    _sum = 0.0
                     last_stats_time = None
                 else:
                     # hourly_consumption/production_data contains the last 30 days
@@ -641,8 +641,9 @@ class TibberDataCoordinator(DataUpdateCoordinator[None]):
                         None,
                         {"sum"},
                     )
-                    _sum = stat[statistic_id][0]["sum"]
-                    last_stats_time = stat[statistic_id][0]["start"]
+                    first_stat = stat[statistic_id][0]
+                    _sum = cast(float, first_stat["sum"])
+                    last_stats_time = first_stat["start"]
 
                 statistics = []