fix(tibber): deduct verkoopvergoeding (sell_fee) from feed-in sell price

Tibber's API `total` already includes the buy-side inkoopvergoeding
(verified from production data: total = spot×1.21 + energy_tax 0.11085 +
inkoopvergoeding 0.0248). Under net metering Tibber pays back
`total − verkoopvergoeding` per returned kWh (NL: EUR 0.28 -> 0.2552), so the
two EUR 0.0248 fees do NOT cancel — the feed-in price sits 0.0248 below buy.

Model the verkoopvergoeding as a first-class, always-subtracted contract
field `energy.sell_fee` (default 0.0248) instead of folding it into
`sell_adjust`. New sell formula:

    sell = total − energy_tax − sell_fee − sell_adjust

`sell_adjust` now carries only the net-metering energy-tax refund
(= −energy_tax). Applied in both the billing strategy and the /prices
endpoint; recorded in the pricing snapshot. Frontend renders the field
automatically (dynamic profile form). Docs (references, m6) corrected to
drop the wrong "fees cancel" premise.

app/api/routes/api/energy.py

@@ -169,7 +169,7 @@ def get_prices(
 
         Response ``points`` carries per-slot:
         - ``buy  = total``              (Tibber all-inclusive price)
-        - ``sell = total − energy_tax − sell_adjust``  (from active version values)
+        - ``sell = total − energy_tax − sell_fee − sell_adjust``  (from active version values)
         - ``level``                     (Tibber price level, may be null)
 
         ``tariff`` is null.
@@ -222,7 +222,8 @@ def get_prices(
         )
         rows = list(reversed(db.execute(stmt).scalars().all()))
 
-        # Derive sell price per-point using version values (energy_tax + sell_adjust).
+        # Derive sell price per-point using version values
+        # (energy_tax + sell_fee + sell_adjust).
         from decimal import Decimal
 
         def _d(v: Any) -> Decimal:
@@ -230,12 +231,13 @@ def get_prices(
 
         energy = version.values.get("energy", {}) if version.values else {}
         energy_tax = _d(energy.get("energy_tax", 0))
+        sell_fee = _d(energy.get("sell_fee", 0))
         sell_adjust = _d(energy.get("sell_adjust", 0))
 
         points = []
         for row in rows:
             total = _d(row.total)
-            sell = float(total - energy_tax - sell_adjust)
+            sell = float(total - energy_tax - sell_fee - sell_adjust)
             points.append(
                 PricePointSchema(
                     starts_at=_as_utc(row.starts_at),

app/integrations/pricing/profiles.py

@@ -123,6 +123,7 @@ class ManualProfile(BaseModel):
 class TibberEnergySpec(BaseModel):
     source: str  # must be "tibber_api"
     energy_tax: FieldSpec  # subtracted from total to derive sell price
+    sell_fee: FieldSpec  # verkoopvergoeding (feed-in fee); always subtracted from sell; default 0.0248
     sell_adjust: FieldSpec  # additional sell-price adjustment; default 0
 
 
@@ -268,10 +269,13 @@ def _fill_defaults_manual(values: dict[str, Any], profile: ManualProfile) -> dic
 
 
 def _fill_defaults_tibber(values: dict[str, Any], profile: TibberProfile) -> dict[str, Any]:
-    """Return a copy of *values* with sell_adjust and management_fee defaults applied."""
+    """Return a copy of *values* with sell_fee, sell_adjust and management_fee defaults applied."""
     filled = dict(values)
 
     energy = dict(filled.get("energy", {}))
+    # Apply default for sell_fee (default=0.0248) if absent.
+    if "sell_fee" not in energy and profile.energy.sell_fee.default is not None:
+        energy["sell_fee"] = profile.energy.sell_fee.default
     # Apply default for sell_adjust (default=0) if absent.
     if "sell_adjust" not in energy and profile.energy.sell_adjust.default is not None:
         energy["sell_adjust"] = profile.energy.sell_adjust.default
@@ -347,6 +351,7 @@ def _validate_tibber_values(values: dict[str, Any], profile: TibberProfile) -> d
 
     # Required energy fields.
     _require_numeric("energy", "energy_tax", energy)
+    _require_numeric("energy", "sell_fee", energy)
     _require_numeric("energy", "sell_adjust", energy)
     # Required standing fields.
     _require_numeric("standing", "management_fee", standing)
@@ -361,9 +366,10 @@ def validate_values(kind: str, values: dict[str, Any]) -> dict[str, Any]:
     """Validate a contract-values dict against the named profile structure.
 
     Fields that carry a ``default`` in the profile (e.g. ``ode``,
-    ``sell_adjust``, tibber ``management_fee``) are silently filled in when
-    absent from *values*.  Fields with no default that are absent, or fields
-    whose value is not a number, cause a ``ProfileValidationError``.
+    ``sell_fee``, ``sell_adjust``, tibber ``management_fee``) are silently
+    filled in when absent from *values*.  Fields with no default that are
+    absent, or fields whose value is not a number, cause a
+    ``ProfileValidationError``.
 
     Parameters
     ----------

app/integrations/pricing/profiles/tibber.yaml

@@ -2,9 +2,10 @@ kind: tibber
 label: Tibber 动态电价（15 分钟）
 
 energy:
-  source: tibber_api              # buy = total (from API); sell = total − energy_tax − sell_adjust
+  source: tibber_api              # buy = total (from API); sell = total − energy_tax − sell_fee − sell_adjust
   energy_tax:  { unit: EUR/kWh }  # subtracted from total to derive sell price (incl. VAT)
-  sell_adjust: { unit: EUR/kWh, default: 0 }  # additional sell-price adjustment (residual spread)
+  sell_fee:    { unit: EUR/kWh, default: 0.0248 }  # verkoopvergoeding (feed-in fee, incl. VAT); always subtracted from sell
+  sell_adjust: { unit: EUR/kWh, default: 0 }  # manual sell-price adjustment; net-metering: set = −energy_tax to refund the tax
 
 standing:                         # fixed charges; UI fills per month, engine prorates to days
   management_fee: { unit: EUR/month, default: 5.99 }

app/integrations/pricing/strategies.py

@@ -209,12 +209,23 @@ def _tibber_strategy(
         query on ``starts_at``.
 
     Formula (§3.4):
-    - ``buy  = total`` (Tibber's all-inclusive price, already includes tax)
-    - ``sell = total − energy_tax − sell_adjust``
+    - ``buy  = total`` (Tibber's all-inclusive price; already includes energy
+      tax, VAT and the buy-side ``inkoopvergoeding``)
+    - ``sell = total − energy_tax − sell_fee − sell_adjust``
     - ``import_cost   = (Δd1 + Δd2) × buy``
     - ``export_revenue = (Δr1 + Δr2) × sell``
     - ``net_cost = import_cost − export_revenue``
 
+    ``sell_fee`` models Tibber's per-kWh **verkoopvergoeding** (feed-in fee,
+    €0.0248/kWh incl. VAT since 2026-01-01).  It is always deducted from the
+    feed-in payout: even under the net-metering (saldering) scheme, Tibber pays
+    ``total − verkoopvergoeding`` per returned kWh (Tibber NL: "€0,28 − €0,0248
+    = €0,2552").  ``total`` already contains the equal buy-side
+    ``inkoopvergoeding``, so the two fees do **not** cancel — the feed-in price
+    sits ``sell_fee`` below the buy price.  ``sell_adjust`` is a separate manual
+    correction: under net metering it carries back the refunded energy tax
+    (``sell_adjust = −energy_tax``), leaving ``sell = total − sell_fee``.
+
     Tibber does not differentiate tariff slots (dal vs normal) — the 15-minute
     API price applies to the full delivered/returned volume.
 
@@ -248,11 +259,12 @@ def _tibber_strategy(
 
     energy = values.get("energy", {})
     energy_tax = _to_decimal(energy.get("energy_tax", 0))
+    sell_fee = _to_decimal(energy.get("sell_fee", 0))
     sell_adjust = _to_decimal(energy.get("sell_adjust", 0))
 
     total = _to_decimal(price_row.total)
     buy = total
-    sell = total - energy_tax - sell_adjust
+    sell = total - energy_tax - sell_fee - sell_adjust
 
     total_delivered = deltas.d1 + deltas.d2
     total_returned = deltas.r1 + deltas.r2
@@ -269,6 +281,7 @@ def _tibber_strategy(
         "buy": str(buy),
         "sell": str(sell),
         "energy_tax": str(energy_tax),
+        "sell_fee": str(sell_fee),
         "sell_adjust": str(sell_adjust),
     }
 

app/integrations/tibber/client.py

@@ -30,20 +30,39 @@ logger = logging.getLogger(__name__)
 _TIBBER_API_URL = "https://api.tibber.com/v1-beta/gql"
 _DEFAULT_TIMEOUT = 15.0
 
-# GraphQL query to fetch a range of 15-minute price nodes.
-# ``priceInfoRange(resolution: QUARTER_HOURLY, first: 96)`` fetches up to
-# 96 quarter-hourly slots which covers today + tomorrow (2 × 24 × 4 = 192 max,
-# but the Tibber API typically starts from the current slot and returns at
-# most the remaining hours of today plus tomorrow, so 96 is a good cap for
-# "today + tomorrow").
+# GraphQL query to fetch the forward-looking today + tomorrow price curve at
+# 15-minute resolution.
+#
+# ``priceInfo(resolution: QUARTER_HOURLY)`` returns two node lists:
+#   * ``today``    — always the full current local day (96 quarter-hourly slots,
+#                    00:00 → 23:45 local), regardless of the current time.
+#   * ``tomorrow`` — the full next local day (96 slots) once Tibber publishes the
+#                    day-ahead prices (around 13:00–15:00 local); empty before that.
+#
+# This is deliberately NOT ``priceInfoRange``: that field is a historical cursor
+# connection whose range ends at "now" (it never returns future slots), so it
+# cannot supply upcoming prices.  ``priceInfo`` is forward-looking, so every
+# 15-minute slot's price is present in the DB *before* the slot closes — which is
+# what makes per-slot billing accurate (each period finds its own exact slot
+# instead of falling back to a stale earlier price) and keeps the live current-
+# price entity fresh.  The hourly refresh job re-runs this query, so tomorrow's
+# prices are picked up within an hour of publication without a restart.
 _PRICE_RANGE_QUERY = """
 {
   viewer {
     homes {
       id
       currentSubscription {
-        priceInfoRange(resolution: QUARTER_HOURLY, first: 96) {
-          nodes {
+        priceInfo(resolution: QUARTER_HOURLY) {
+          today {
+            startsAt
+            total
+            energy
+            tax
+            currency
+            level
+          }
+          tomorrow {
             startsAt
             total
             energy
@@ -230,11 +249,15 @@ def fetch_price_range(
     *,
     timeout: float = _DEFAULT_TIMEOUT,
 ) -> list[PricePoint]:
-    """Fetch a range of 15-minute price nodes from the Tibber API.
+    """Fetch the forward-looking today + tomorrow 15-minute price curve from Tibber.
 
-    Sends the ``priceInfoRange(resolution: QUARTER_HOURLY, first: 96)`` query
-    and parses every returned node into a ``PricePoint``.  The number of nodes
-    is not assumed — all returned nodes are parsed regardless of count.
+    Sends the ``priceInfo(resolution: QUARTER_HOURLY) { today tomorrow }`` query
+    and parses every node from both lists (today first, then tomorrow) into a
+    ``PricePoint``.  ``priceInfo`` is forward-looking — ``today`` is always the
+    full current local day and ``tomorrow`` is populated once Tibber publishes the
+    day-ahead prices — so upcoming slots are returned, unlike ``priceInfoRange``
+    which only reaches "now".  ``tomorrow`` may be empty (before publication); the
+    number of nodes is not assumed and all returned nodes are parsed.
 
     Parameters
     ----------
@@ -268,10 +291,15 @@ def fetch_price_range(
     home = _pick_home(homes, home_id)
 
     try:
-        nodes = home["currentSubscription"]["priceInfoRange"]["nodes"]
+        price_info = home["currentSubscription"]["priceInfo"]
+        today = price_info["today"]
+        tomorrow = price_info["tomorrow"]
     except (KeyError, TypeError) as exc:
-        raise TibberError("Tibber API response missing priceInfoRange nodes") from exc
+        raise TibberError("Tibber API response missing priceInfo today/tomorrow") from exc
 
+    # tomorrow is null/empty until Tibber publishes the day-ahead prices; treat
+    # a missing list as empty so we still return today's slots.
+    nodes = list(today or []) + list(tomorrow or [])
     return [_parse_node(node, "QUARTER_HOURLY") for node in nodes]
 
 

docs/design/m6-tibber-dynamic-energy.md

@@ -118,8 +118,9 @@ credits:
 kind: tibber
 label: Tibber 动态电价（15 分钟）
 energy:
-  source: tibber_api             # buy = total; sell = total − energy_tax − sell_adjust
+  source: tibber_api             # buy = total; sell = total − energy_tax − sell_fee − sell_adjust
   energy_tax:   { unit: EUR/kWh }
+  sell_fee:     { unit: EUR/kWh, default: 0.0248 }  # verkoopvergoeding, always subtracted
   sell_adjust:  { unit: EUR/kWh, default: 0 }
 standing:
   management_fee: { unit: EUR/month, default: 5.99 }
@@ -164,7 +165,7 @@ credits:
   1. 取各寄存器在 `t0`/`t1` 的值（`recorded_at ≤ 边界` 的最后一行，Decimal），算 **per-register 差**：`Δd1,Δd2,Δr1,Δr2`。
   2. 取 active 合同**在 t0 生效的版本** + 其 strategy：
      - `manual`：`import_cost = Δd1×(buy_dal) + Δd2×(buy_normal)`（`buy_x = energy_buy_x + energy_tax + ode`）；`export_revenue = Δr1×sell_dal + Δr2×sell_normal`。
-     - `tibber`：取覆盖 t0 的 `tibber_price`（`starts_at ≤ t0` 最近一条）；`buy = total`、`sell = total − energy_tax − sell_adjust`；`import_cost = (Δd1+Δd2)×buy`、`export_revenue = (Δr1+Δr2)×sell`。
+     - `tibber`：取覆盖 t0 的 `tibber_price`（`starts_at ≤ t0` 最近一条）；`buy = total`、`sell = total − energy_tax − sell_fee − sell_adjust`（`sell_fee`=verkoopvergoeding，默认 0.0248，见下修正说明）；`import_cost = (Δd1+Δd2)×buy`、`export_revenue = (Δr1+Δr2)×sell`。
   3. `net_cost = import_cost − export_revenue`；**upsert** `energy_cost_period`，**快照**当时用的价 + `contract_version_id`。
 - 缺价/缺数据：跳过或标 `degraded`，留待重算。**不做净计量**（进出口分开累加）。
 
@@ -240,7 +241,7 @@ credits:
 
 1. **两层电价模型**：profile YAML 定结构（仓库、固定、UI 不可编辑）+ `EnergyContract`(+版本) 存数值（UI 填、版本化）+ strategy 按 kind 出价。仿 M5。
 2. **kind 不叫 "fixed"**：`manual`（人工填、可双费率、可带时段）/ `tibber`（API 动态）；合同 `name` UI 自由填。
-3. **买价**：tibber = API `total`（全包，已证 total=energy+tax）；manual = `energy_buy_档 + energy_tax`。**卖价**：tibber = `total − energy_tax − sell_adjust`；manual = `sell_档`（回送价，无能源税）。均含 VAT。
+3. **买价**：tibber = API `total`（全包，已证 total=energy+tax；含 inkoopvergoeding）；manual = `energy_buy_档 + energy_tax`。**卖价**：tibber = `total − energy_tax − sell_fee − sell_adjust`（`sell_fee`=verkoopvergoeding 默认 0.0248）；manual = `sell_档`（回送价，无能源税）。均含 VAT。
 4. **双费率**：manual 用 `delivered_1/2`、`returned_1/2` 分 dal/normal 计价（`_1`=dal/低、`_2`=normal/高）；tibber 求和、15min 价不分档。
 5. **两层费用**：每 15min `energy_cost_period` 只算计量电费（不可变、快照价）；日/月/年汇总再加固定费（按月→天）− heffingskorting（按年→天）。
 6. **回送阶梯罚金（terugleverkosten）不做**：按自然年累计、用户住不到年底算不准——不算、不记、不加功能（留痕见 §10）。
@@ -475,7 +476,7 @@ Phase D（API + 前端）
 ## 13. 待确认 / TODO（拿到真实 token + 账单后钉死，均已落成配置/默认值，不阻塞实现）
 
 1. **买价**：✅ tibber = API `total`（demo 已证 total=energy+tax）；manual = energy_buy_档 + energy_tax。无待办。
-2. **卖价残差（tibber）**：`sell = total − energy_tax − sell_adjust`，`sell_adjust` 默认 0（买卖费相等抵消）。真实账单确认后若有残差再调。
+2. **卖价残差（tibber）**：~~`sell = total − energy_tax − sell_adjust`，`sell_adjust` 默认 0（买卖费相等抵消）~~ → **已修正（2026-07，见 references §3.1）**：`total` 含 inkoopvergoeding，净计量回送 = `total − verkoopvergoeding`，两费**不抵消**。公式改为 `sell = total − energy_tax − sell_fee − sell_adjust`，新增 `sell_fee`（默认 0.0248，始终扣除）；`sell_adjust` 净计量期设 `−energy_tax`。真实账单确认后若有残差再调 `sell_fee`。
 3. **双费率寄存器映射**：`_1`=dal/低、`_2`=normal/高（NL 惯例）——接价前用真实数据确认别接反（差价小但要对）。
 4. **能源税年值**：manual/tibber 的 `energy_tax` 默认 ~0.1108（2026 第一档含 VAT），按当年实际值核。
 5. **Tibber 15min + 币种**：✅ 查询/分辨率已 demo 证实；仍需合同生效后用**真实 token** 确认 NL 返回真 15 分钟价 + 币种 EUR。

docs/references/Tibber-and-NL-Energy-Pricing.md

@@ -113,16 +113,26 @@ curl -s -X POST https://api.tibber.com/v1-beta/gql \
 > "De verkoopvergoeding van 2,48 cent is gelijk aan de inkoopvergoeding die je bij je afgenomen stroom betaalt."
 > （卖侧 verkoopvergoeding 2.48 分 = 买侧 inkoopvergoeding。）
 
-→ **买卖服务费相等（均 €0.0248/kWh）**，在买卖里一进一出**相互抵消**。
+→ **买卖服务费金额相等（均 €0.0248/kWh），但两者对住户都是成本、不互相抵消**：
+- 买侧 inkoopvergoeding 已经**包含在 Tibber API 的 `total` 里**（见下 §3.1 的实证拆解），买电按 `total` 计价即已含它。
+- 卖侧 verkoopvergoeding 则是从回送价里**额外扣掉**的一笔——所以回送价 = `total − 0.0248`，比买价低 0.0248/kWh。
+- ⚠️ **早期版本误判为"一进一出抵消 → 回送=total"**，这是错的：`total` 里那笔 inkoopvergoeding 不会退回来充抵 verkoopvergoeding。代码里用 `energy.sell_fee`（默认 0.0248）建模这笔卖侧费用。
 
 ---
 
 ## 3. 净计量（saldering）、回送（teruglevering）、负电价、2027
 
-### 3.1 回送价（净计量期内，文档原文）
+### 3.1 回送价（净计量期内，文档原文 + 实证）
 > "Op het moment dat je teruglevert geven we je per kWh de beursprijs die op dat moment geldt …, inclusief energiebelasting en inkoopvergoeding plus de btw minus de verkoopvergoeding."
 
-即净计量期内回送价 = `beursprijs + energiebelasting + inkoopvergoeding + btw − verkoopvergoeding`。因 inkoopvergoeding = verkoopvergoeding 抵消 → **= 全额零售价**（spot+能源税+VAT），正是 saldering "回送 1 度 = 用 1 度"的本质。
+> **Worked example（Tibber NL 原文）**："Stel dat tussen 14:00 en 14:15 de totale stroomprijs €0,28 per kWh incl. is, dan krijg je €0,28 − €0,0248 verkoopvergoeding = **€0,2552** per teruggeleverde kWh terug."
+
+即净计量期内回送价 = `beursprijs + energiebelasting + inkoopvergoeding + btw − verkoopvergoeding`，而官方例子直接写成 **`回送价 = totale stroomprijs − verkoopvergoeding = total − 0.0248`**。能源税**退回**（留在 total 里没动），只有 verkoopvergoeding 这 0.0248 被扣。
+
+**✅ 实证（本项目生产库，2026-07-20 三个刻钟）**：按 21% VAT 拆 `total`：`total = 现货×1.21 + energiebelasting(0.11085) + inkoopvergoeding(0.0248)`，三段解出的 inkoop 都精确等于 **0.0248**。→ **我们存的 `tibber_price.total` 就是官方 "totale stroomprijs"（含 inkoopvergoeding 的买价）**，因此：
+- 买价 `buy = total`（已含 inkoopvergoeding，正确）。
+- 净计量回送价 `sell = total − verkoopvergoeding = total − 0.0248`。
+- ⚠️ 所以 saldering 下"回送 1 度"仍比"用 1 度"少 0.0248——**不是完全 1:1**。代码用 `sell_fee` 建模这笔扣减，`sell_adjust` 只负责在净计量期把能源税补回（`sell_adjust = −energy_tax`）。
 
 ### 3.2 年末盈余 / 取消净计量后（文档原文，Scenario 2）
 > "Voor de overproductie van 500 kWh heb je recht op de beursprijs en de inkoopvergoeding, maar heb je geen recht op de energiebelasting. … ontvang je nog een factuur van ons voor de te veel uitgekeerde belastingen …"
@@ -146,9 +156,11 @@ curl -s -X POST https://api.tibber.com/v1-beta/gql \
 
 > spot 取 API `energy`；`total = energy + tax`（全包）。**买价直接用 `total`**，卖价从 `total` 扣掉卖电不交的能源税。
 
-- **Tibber 动态合同**（post-2027 口径）：
-  - 买价 `buy = price.total`
-  - 卖价 `sell = price.total − energy_tax_per_kwh − sell_adjust`（`sell_adjust` 默认 0；含 VAT 归己；买卖费抵消已隐含在 total 里）
+- **Tibber 动态合同**：
+  - 买价 `buy = price.total`（含 energy_tax + VAT + inkoopvergoeding）
+  - 卖价 `sell = price.total − energy_tax − sell_fee − sell_adjust`
+    - `sell_fee`：verkoopvergoeding（卖侧上网费，默认 **0.0248**，含 VAT），**始终扣除**——即使净计量期也扣（见 §3.1）。
+    - `sell_adjust`：手动修正项（默认 0）。**净计量期**设为 `−energy_tax`（把能源税补回），得 `sell = total − sell_fee`；**2027 取消净计量后**设为 0，得 `sell = total − energy_tax − sell_fee`（无能源税、纯市场价再扣上网费）。
 - **固定合同（manual，双费率）**：
   - 买价 `buy_档 = energy_buy_档 + energy_tax`（档 ∈ {normal, dal}）
   - 卖价 `sell_档 = sell_档`（回送价，**无能源税**）
@@ -242,7 +254,7 @@ extra_device_timestamp, extra_device_delivered           # 燃气表（m³，每
 ## 8. 待真实数据核对（合同生效后用真实 token / 账单）
 
 1. **真实 token 复核**：跑 §1.4 的 15 分钟 curl，确认 NL 返回**真** 15 分钟价（非重复小时价）+ 币种 EUR。
-2. **卖价残差**：确认 `total` 里 purchase fee 是否被卖侧 sales fee 完全抵掉、回送 VAT 口径 → 调 `sell_adjust`（默认 0）。
+2. ~~**卖价残差**：确认 `total` 里 purchase fee 是否被卖侧 sales fee 完全抵掉~~ → **已核实（2026-07）**：`total` 含 inkoopvergoeding（0.0248），净计量回送价 = `total − verkoopvergoeding(0.0248)`，两费**不抵消**；代码以 `sell_fee`（默认 0.0248）建模。仍待真实账单核对 `sell_fee` / VAT 口径的最终残差。
 3. **双费率寄存器映射**：确认 `_1`=dal/`_2`=normal 没接反（差价小但要对）。
 4. **能源税年值**：按当年实际值与年用电档位核 `energy_tax`。
 5. **固定合同数值**：回送两档价、电网费、heffingskorting 待用户从账单填。

openapi/openapi.json

@@ -701,7 +701,7 @@
           "api-energy"
         ],
         "summary": "Get Prices",
-        "description": "Return the price curve for the active contract.\n\n**Tibber contracts** (kind=\"tibber\"):\n    Fetches ``tibber_price`` rows within ``[start, end]``, ordered ascending\n    by ``starts_at``.  At most ``limit`` rows are returned (most recent first\n    within the window, then reversed to ascending order — identical to the\n    modbus readings pattern).\n\n    Response ``points`` carries per-slot:\n    - ``buy  = total``              (Tibber all-inclusive price)\n    - ``sell = total − energy_tax − sell_adjust``  (from active version values)\n    - ``level``                     (Tibber price level, may be null)\n\n    ``tariff`` is null.\n\n**Manual contracts** (kind=\"manual\"):\n    ``points`` is empty.  ``tariff`` carries the four effective prices\n    derived using the billing engine formula:\n    - ``buy_dal    = energy.buy.dal    + energy_tax + ode``\n    - ``buy_normal = energy.buy.normal + energy_tax + ode``\n    - ``sell_dal   = energy.sell.dal``\n    - ``sell_normal = energy.sell.normal``\n\n**No active contract**: returns kind=null, currency=\"EUR\", points=[], tariff=null (200).",
+        "description": "Return the price curve for the active contract.\n\n**Tibber contracts** (kind=\"tibber\"):\n    Fetches ``tibber_price`` rows within ``[start, end]``, ordered ascending\n    by ``starts_at``.  At most ``limit`` rows are returned (most recent first\n    within the window, then reversed to ascending order — identical to the\n    modbus readings pattern).\n\n    Response ``points`` carries per-slot:\n    - ``buy  = total``              (Tibber all-inclusive price)\n    - ``sell = total − energy_tax − sell_fee − sell_adjust``  (from active version values)\n    - ``level``                     (Tibber price level, may be null)\n\n    ``tariff`` is null.\n\n**Manual contracts** (kind=\"manual\"):\n    ``points`` is empty.  ``tariff`` carries the four effective prices\n    derived using the billing engine formula:\n    - ``buy_dal    = energy.buy.dal    + energy_tax + ode``\n    - ``buy_normal = energy.buy.normal + energy_tax + ode``\n    - ``sell_dal   = energy.sell.dal``\n    - ``sell_normal = energy.sell.normal``\n\n**No active contract**: returns kind=null, currency=\"EUR\", points=[], tariff=null (200).",
         "operationId": "get_prices_api_energy_prices_get",
         "parameters": [
           {

openapi/openapi.yaml

@@ -527,9 +527,9 @@ paths:
         \ (most recent first\n    within the window, then reversed to ascending order\
         \ — identical to the\n    modbus readings pattern).\n\n    Response ``points``\
         \ carries per-slot:\n    - ``buy  = total``              (Tibber all-inclusive\
-        \ price)\n    - ``sell = total − energy_tax − sell_adjust``  (from active\
-        \ version values)\n    - ``level``                     (Tibber price level,\
-        \ may be null)\n\n    ``tariff`` is null.\n\n**Manual contracts** (kind=\"\
+        \ price)\n    - ``sell = total − energy_tax − sell_fee − sell_adjust``  (from\
+        \ active version values)\n    - ``level``                     (Tibber price\
+        \ level, may be null)\n\n    ``tariff`` is null.\n\n**Manual contracts** (kind=\"\
         manual\"):\n    ``points`` is empty.  ``tariff`` carries the four effective\
         \ prices\n    derived using the billing engine formula:\n    - ``buy_dal \
         \   = energy.buy.dal    + energy_tax + ode``\n    - ``buy_normal = energy.buy.normal\

tests/test_api_energy.py

@@ -363,13 +363,65 @@ def test_prices_tibber_contract_returns_points(energy_client):
     starts_at_list = [p["starts_at"] for p in body["points"]]
     assert starts_at_list == sorted(starts_at_list)
 
-    # Check buy/sell calculations: buy=total=0.245, sell=total-energy_tax-sell_adjust=0.245-0.1108-0.0
+    # Check buy/sell calculations: buy=total=0.245, sell=total-energy_tax-sell_fee-sell_adjust
+    # (this version has no sell_fee/sell_adjust → both default to 0 at read time).
     for p in body["points"]:
         assert abs(p["buy"] - 0.245) < 1e-6
         assert abs(p["sell"] - (0.245 - 0.1108)) < 1e-4
         assert p["level"] == "NORMAL"
 
 
+def test_prices_tibber_sell_reflects_sell_fee(energy_client):
+    """/prices sell price deducts sell_fee (verkoopvergoeding), net-metering config."""
+    client, engine, _app = energy_client
+    _login(client)
+
+    # Net-metering version: sell_adjust = −energy_tax (refund tax), sell_fee = 0.0248.
+    now = datetime.now(UTC)
+    with Session(engine) as session:
+        contract = EnergyContract(
+            name="Tibber NetMeter",
+            kind="tibber",
+            active=True,
+            currency="EUR",
+            created_at=now,
+            updated_at=now,
+        )
+        session.add(contract)
+        session.flush()
+        session.add(
+            EnergyContractVersion(
+                contract_id=contract.id,
+                effective_from=now - timedelta(days=30),
+                effective_to=None,
+                values={
+                    "energy": {
+                        "energy_tax": 0.1108,
+                        "sell_fee": 0.0248,
+                        "sell_adjust": -0.1108,
+                    },
+                    "standing": {"management_fee": 5.99, "network_fee": 25.0},
+                    "credits": {"heffingskorting": 600.0},
+                },
+                created_at=now,
+            )
+        )
+        session.commit()
+    _make_tibber_prices(engine, count=3)
+
+    start = (datetime.now(UTC) - timedelta(hours=2)).isoformat()
+    end = (datetime.now(UTC) + timedelta(hours=2)).isoformat()
+    resp = client.get("/api/energy/prices", params={"start": start, "end": end})
+    assert resp.status_code == 200
+    body = resp.json()
+    assert body["kind"] == "tibber"
+    assert len(body["points"]) == 3
+    # sell = 0.245 − 0.1108 − 0.0248 − (−0.1108) = 0.245 − 0.0248 = 0.2202
+    for p in body["points"]:
+        assert abs(p["buy"] - 0.245) < 1e-6
+        assert abs(p["sell"] - 0.2202) < 1e-4
+
+
 def test_prices_tibber_limit_caps_results(energy_client):
     client, engine, _app = energy_client
     _login(client)

tests/test_energy_cost.py

@@ -1263,6 +1263,9 @@ class TestSummarizePrincipleC:
     def test_future_window_counts_0_days(self, energy_db: Session) -> None:
         """A fully future window (all local dates > today) counts 0 days.
 
+        Pins ``local_now`` to June 25 2026 noon AMS so the 7/1→8/1 window is
+        genuinely in the future regardless of the actual wall-clock date
+        (mirrors the sibling window tests, which all pin ``local_now``).
         Matches table row: 7/1→8/1 (all future) → 0 days.
         """
         eff_utc = _ams_midnight(2026, 6, 1)
@@ -1270,7 +1273,9 @@ class TestSummarizePrincipleC:
 
         start = _ams_midnight(2026, 7, 1)
         end = _ams_midnight(2026, 8, 1)
-        result = self._run_summarize_ams(energy_db, start, end)
+        # Pin local_now to June 25 2026 noon AMS so 7/1→8/1 stays fully future.
+        pinned_now = datetime(2026, 6, 25, 12, 0, 0, tzinfo=_ams())
+        result = self._run_summarize_ams(energy_db, start, end, pinned_now=pinned_now)
 
         assert result["fixed_costs"] == 0.0, (
             f"All-future window must count 0 days; got fixed_costs={result['fixed_costs']}"

tests/test_pricing_profiles.py

@@ -137,6 +137,11 @@ class TestLoadProfileTibber:
         profile = load_profile("tibber")
         assert profile.energy.sell_adjust.default == 0
 
+    def test_sell_fee_has_default_verkoopvergoeding(self) -> None:
+        profile = load_profile("tibber")
+        assert profile.energy.sell_fee.unit == "EUR/kWh"
+        assert profile.energy.sell_fee.default == 0.0248
+
     def test_management_fee_has_default(self) -> None:
         profile = load_profile("tibber")
         assert profile.standing.management_fee.default is not None
@@ -350,6 +355,19 @@ class TestValidateValuesTibber:
         filled = validate_values("tibber", values)
         assert filled["energy"]["sell_adjust"] == 0
 
+    def test_sell_fee_default_applied_when_absent(self) -> None:
+        values = {
+            "energy": {
+                "energy_tax": 0.1108,
+                "sell_adjust": 0.0,
+                # sell_fee absent — has default 0.0248 (verkoopvergoeding)
+            },
+            "standing": {"management_fee": 5.99, "network_fee": 9.87},
+            "credits": {"heffingskorting": 600.0},
+        }
+        filled = validate_values("tibber", values)
+        assert filled["energy"]["sell_fee"] == 0.0248
+
     def test_management_fee_default_applied_when_absent(self) -> None:
         values = {
             "energy": {"energy_tax": 0.1108, "sell_adjust": 0.0},

tests/test_pricing_strategies.py

@@ -6,7 +6,7 @@ Acceptance criteria covered
 2. Manual strategy: dual-tariff import/export/net calculated correctly (hand-verified).
 3. Manual strategy: Decimal precision — no float binary rounding errors.
 4. Tibber strategy: queries the most recent TibberPrice with starts_at ≤ t0.
-5. Tibber strategy: buy=total, sell=total−energy_tax−sell_adjust.
+5. Tibber strategy: buy=total, sell=total−energy_tax−sell_fee−sell_adjust.
 6. Tibber strategy: negative total → negative export_revenue (not clamped).
 7. Tibber strategy: raises TibberPriceNotFoundError when no matching row exists.
 8. ``register_strategy`` / ``get_strategy`` round-trip works.
@@ -371,6 +371,68 @@ class TestTibberStrategy:
         # sell = 0.25 - 0.10 - 0.02 = 0.13; export_revenue = 2 × 0.13 = 0.26
         assert result["export_revenue"] == Decimal("2") * Decimal("0.13")
 
+    def test_sell_deducts_sell_fee(self, tibber_db) -> None:
+        """verkoopvergoeding (sell_fee) is subtracted from the feed-in price.
+
+        Under net metering the energy tax is refunded (sell_adjust = −energy_tax),
+        so sell should equal total − sell_fee. Verifies the fee is a first-class,
+        always-deducted term and does NOT cancel against the buy-side inkoopvergoeding
+        that is already baked into total.
+        """
+        t0 = _ts(10, 0)
+        with Session(tibber_db) as session:
+            _insert_tibber_price(session, starts_at=_ts(9, 45), total=0.3073)
+            session.commit()
+
+        # Net-metering config: sell_adjust = −energy_tax refunds the tax;
+        # sell_fee = 0.0248 (Tibber verkoopvergoeding) is still deducted.
+        values = {
+            "energy": {
+                "energy_tax": 0.11085,
+                "sell_fee": 0.0248,
+                "sell_adjust": -0.11085,
+            },
+            "standing": {"management_fee": 5.99, "network_fee": 9.87},
+            "credits": {"heffingskorting": 600.0},
+        }
+        with Session(tibber_db) as session:
+            deltas = PeriodDeltas(
+                d1=Decimal("0"), d2=Decimal("0"),
+                r1=Decimal("0"), r2=Decimal("1"),
+            )
+            result = self._call(deltas, t0, session, values=values)
+
+        # sell = 0.3073 − 0.11085 − 0.0248 − (−0.11085) = 0.3073 − 0.0248 = 0.2825
+        expected_sell = (
+            Decimal("0.3073") - Decimal("0.11085") - Decimal("0.0248") - Decimal("-0.11085")
+        )
+        assert expected_sell == Decimal("0.2825")
+        assert result["export_revenue"] == Decimal("1") * expected_sell
+        assert result["pricing"]["sell_fee"] == "0.0248"
+        assert Decimal(result["pricing"]["sell"]) == Decimal("0.2825")
+
+    def test_sell_fee_absent_defaults_to_zero(self, tibber_db) -> None:
+        """A version without sell_fee (pre-migration) reads it as 0 — no silent deduction."""
+        t0 = _ts(10, 0)
+        with Session(tibber_db) as session:
+            _insert_tibber_price(session, starts_at=_ts(9, 45), total=0.25)
+            session.commit()
+
+        values = {
+            "energy": {"energy_tax": 0.10, "sell_adjust": 0.0},  # no sell_fee key
+            "standing": {"management_fee": 5.99, "network_fee": 9.87},
+            "credits": {"heffingskorting": 600.0},
+        }
+        with Session(tibber_db) as session:
+            deltas = PeriodDeltas(
+                d1=Decimal("0"), d2=Decimal("0"),
+                r1=Decimal("0"), r2=Decimal("1"),
+            )
+            result = self._call(deltas, t0, session, values=values)
+        # sell = 0.25 − 0.10 − 0 − 0 = 0.15
+        assert result["export_revenue"] == Decimal("0.15")
+        assert result["pricing"]["sell_fee"] == "0"
+
     def test_uses_most_recent_price_before_t0(self, tibber_db) -> None:
         """Correct row: starts_at ≤ t0, most recent wins."""
         t0 = _ts(10, 0)

tests/test_tibber_client.py

@@ -69,22 +69,28 @@ _THREE_NODES = [
     },
 ]
 
-_PRICE_RANGE_RESPONSE = {
-    "data": {
-        "viewer": {
-            "homes": [
-                {
-                    "id": "home-id-1",
-                    "currentSubscription": {
-                        "priceInfoRange": {
-                            "nodes": _THREE_NODES,
-                        }
-                    },
-                }
-            ]
+def _price_info_response(today: list[dict], tomorrow: list[dict] | None = None) -> dict:
+    """Build a priceInfo(resolution: QUARTER_HOURLY) { today tomorrow } response."""
+    return {
+        "data": {
+            "viewer": {
+                "homes": [
+                    {
+                        "id": "home-id-1",
+                        "currentSubscription": {
+                            "priceInfo": {
+                                "today": today,
+                                "tomorrow": tomorrow if tomorrow is not None else [],
+                            }
+                        },
+                    }
+                ]
+            }
         }
     }
-}
+
+
+_PRICE_RANGE_RESPONSE = _price_info_response(_THREE_NODES)
 
 _CURRENT_PRICE_RESPONSE = {
     "data": {
@@ -173,23 +179,8 @@ def test_fetch_price_range_parses_nodes(monkeypatch):
 
 def test_fetch_price_range_does_not_assume_node_count(monkeypatch):
     """Parser handles an arbitrary number of nodes (not hardcoded to 96)."""
-    # Build a response with a single node only.
-    one_node_response = {
-        "data": {
-            "viewer": {
-                "homes": [
-                    {
-                        "id": "home-id-1",
-                        "currentSubscription": {
-                            "priceInfoRange": {
-                                "nodes": [_THREE_NODES[0]],
-                            }
-                        },
-                    }
-                ]
-            }
-        }
-    }
+    # Build a response with a single today node and no tomorrow yet.
+    one_node_response = _price_info_response([_THREE_NODES[0]])
     transport = _make_transport(200, one_node_response)
 
     def _patched_post(url, *, json, headers, timeout):  # noqa: A002
@@ -202,6 +193,68 @@ def test_fetch_price_range_does_not_assume_node_count(monkeypatch):
     assert len(points) == 1
 
 
+def test_fetch_price_range_concatenates_today_and_tomorrow(monkeypatch):
+    """today and tomorrow node lists are both parsed (today first, then tomorrow)."""
+    tomorrow_nodes = [
+        {
+            "startsAt": "2026-06-24T00:00:00.000+02:00",
+            "total": 0.40,
+            "energy": 0.32,
+            "tax": 0.08,
+            "currency": "EUR",
+            "level": "EXPENSIVE",
+        },
+    ]
+    response = _price_info_response(_THREE_NODES, tomorrow_nodes)
+    transport = _make_transport(200, response)
+
+    def _patched_post(url, *, json, headers, timeout):  # noqa: A002
+        client = httpx.Client(transport=transport)
+        return client.post(url, json=json, headers=headers, timeout=timeout)
+
+    monkeypatch.setattr("app.integrations.tibber.client.httpx.post", _patched_post)
+
+    points = fetch_price_range(_FAKE_TOKEN)
+    # 3 today + 1 tomorrow, in order.
+    assert len(points) == 4
+    # First node is today's first; last node is tomorrow's.
+    assert points[0].starts_at == datetime(2026, 6, 22, 22, 0, 0, tzinfo=UTC)
+    # 2026-06-24T00:00:00+02:00 → 2026-06-23T22:00:00Z
+    assert points[-1].starts_at == datetime(2026, 6, 23, 22, 0, 0, tzinfo=UTC)
+    assert points[-1].total == pytest.approx(0.40)
+
+
+def test_fetch_price_range_tomorrow_null_returns_today_only(monkeypatch):
+    """A null tomorrow (before day-ahead publication) yields today's nodes only."""
+    response = {
+        "data": {
+            "viewer": {
+                "homes": [
+                    {
+                        "id": "home-id-1",
+                        "currentSubscription": {
+                            "priceInfo": {
+                                "today": _THREE_NODES,
+                                "tomorrow": None,
+                            }
+                        },
+                    }
+                ]
+            }
+        }
+    }
+    transport = _make_transport(200, response)
+
+    def _patched_post(url, *, json, headers, timeout):  # noqa: A002
+        client = httpx.Client(transport=transport)
+        return client.post(url, json=json, headers=headers, timeout=timeout)
+
+    monkeypatch.setattr("app.integrations.tibber.client.httpx.post", _patched_post)
+
+    points = fetch_price_range(_FAKE_TOKEN)
+    assert len(points) == 3
+
+
 def test_fetch_price_range_home_id_selection(monkeypatch):
     """When home_id is specified, the matching home is selected."""
     two_homes_response = {
@@ -211,16 +264,18 @@ def test_fetch_price_range_home_id_selection(monkeypatch):
                     {
                         "id": "home-id-first",
                         "currentSubscription": {
-                            "priceInfoRange": {
-                                "nodes": [_THREE_NODES[0]],
+                            "priceInfo": {
+                                "today": [_THREE_NODES[0]],
+                                "tomorrow": [],
                             }
                         },
                     },
                     {
                         "id": "home-id-second",
                         "currentSubscription": {
-                            "priceInfoRange": {
-                                "nodes": [_THREE_NODES[1], _THREE_NODES[2]],
+                            "priceInfo": {
+                                "today": [_THREE_NODES[1], _THREE_NODES[2]],
+                                "tomorrow": [],
                             }
                         },
                     },