diff --git a/tests/check_concentrator.py b/tests/check_concentrator.py
index c806f9f..aef118d 100644
--- a/tests/check_concentrator.py
+++ b/tests/check_concentrator.py
@@ -5,8 +5,8 @@ metrics tables covering **this machine** and each configured **remote**. The con
 has **Location** (``local`` or remote IP/hostname, plus **tty** names when known) and **USB**
 (Bus/Device, VID:PID, product from sysfs). The per-port table starts with **Panel** (``fiber_ports``
 key / rack position when ``hub``, ``port``, and optional ``ssh`` match this run), rows sorted by panel
-number; a **Power: Total … W / … mA (per port follows)** line heads the section, then the column header
-and rows.
+number; a **Power(N): Total … W / … mA (per port follows)** line heads the section (``N`` = ports with
+``power`` ON), then columns **mA**, **V**, **W**, and **Location**.
 (no USB column).
 Adnacom PCIe catalog last.
 
@@ -55,8 +55,8 @@ _CONSOLIDATED_HUB_HDR = (
     f"{'#':<4} | {'Serial':<12} | {'Ports':<10} | {'Location':<28} | USB (Bus / ID / product)"
 )
 _PER_PORT_PWR_HDR = (
-    f"{'Panel':<8} | {'Hub#':<4} | {'Serial':<12} | {'Pt':<3} | {'Pwr':<5} | "
-    f"{'mA':>8} | {'V':>8} | Location"
+    f"{'Panel':<8} | {'Hub#':<4} | {'Serial':<12} | {'Pt':<3} | "
+    f"{'mA':>10} | {'V':>8} | {'W':>10} | Location"
 )
 
 _HUB_TABLE_ROW_RE = re.compile(
@@ -693,7 +693,8 @@ def _print_per_port_power_table(
     base_rc: int,
 ) -> int:
     """
-    ``Power: Total …`` line, then per-port current (mA), voltage (V), and Location (sorted by panel).
+    ``Power(N): Total …`` line (``N`` = count of ports reporting power ON), then per-port **mA**, **V**,
+    **W**, and Location (sorted by panel).
     Returns ``base_rc`` OR’d with failure if any ``port-metrics-json`` remote call fails.
     """
     rc = base_rc
@@ -729,6 +730,7 @@ def _print_per_port_power_table(
     n_ma = 0
     total_power_w = 0.0
     n_power = 0
+    n_on = 0
     for row in hub_rows:
         sn_key = _norm_hub_serial(row.serial)
         if row.ssh_target is None:
@@ -740,10 +742,12 @@ def _print_per_port_power_table(
             m = by_port.get(port)
             cur_f: float | None = None
             v_f: float | None = None
+            w_s = "—"
             if m is None:
-                pwr, ma_s, v_s = "?", "—", "—"
+                ma_s, v_s = "—", "—"
             else:
-                pwr = str(m.get("power", "?"))
+                if m.get("power") == "ON":
+                    n_on += 1
                 cur = m.get("current_ma")
                 if cur is None:
                     ma_s = "—"
@@ -767,22 +771,25 @@ def _print_per_port_power_table(
                 if cur_f is not None and v_f is not None:
                     total_power_w += v_f * (cur_f / 1000.0)
                     n_power += 1
+                    w_s = f"{v_f * cur_f / 1000.0:.3f}"
             pnl = _panel_cell(panel_lookup, hub_rows, row, port)
             st = _panel_sort_tuple(pnl, row.idx, port)
             line = (
-                f"{pnl:<8} | {row.idx:<4} | {row.serial:<12} | {port:<3} | {pwr:<5} | "
-                f"{ma_s:>8} | {v_s:>8} | {_location_cell(row)}"
+                f"{pnl:<8} | {row.idx:<4} | {row.serial:<12} | {port:<3} | "
+                f"{ma_s:>10} | {v_s:>8} | {w_s:>10} | {_location_cell(row)}"
             )
             lines_out.append((st, line))
 
     if n_ma and n_power:
         summary = (
-            f"Power: Total {total_power_w:.3f} W / {total_ma:.2f} mA (per port follows)"
+            f"Power({n_on}): Total {total_power_w:.3f} W / {total_ma:.2f} mA (per port follows)"
         )
     elif n_ma:
-        summary = f"Power: Total — W / {total_ma:.2f} mA (per port follows)"
+        summary = (
+            f"Power({n_on}): Total — W / {total_ma:.2f} mA (per port follows)"
+        )
     else:
-        summary = "Power: — (per port follows)"
+        summary = f"Power({n_on}): — (per port follows)"
 
     print(summary, flush=True)
     print("-" * len(_PER_PORT_PWR_HDR), flush=True)